[ { "sku": "7200", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 29, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6200 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "miniature pump rotors", "servo drive shafts", "fans and blowers", "hand tool rotors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 10 mm bore is the default general-purpose angular-contact envelope (30×9 mm); the deep-groove counterpart 6200 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7200 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7200 angular-contact bearing?", "a": "A 7200 single-row angular-contact ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 29 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7200?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7200 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7200 compare with a deep-groove 6200?", "a": "Both share the 10×30×9 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7200 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6200." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7201", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 35, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6201 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo drive shafts", "fans and blowers", "hand tool rotors", "small precision gearboxes" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 12 mm bore is the default general-purpose angular-contact envelope (32×10 mm); the deep-groove counterpart 6201 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7201 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7201 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7201 angular-contact bearing?", "a": "A 7201 single-row angular-contact ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 35 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7201?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7201 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7201 compare with a deep-groove 6201?", "a": "Both share the 12×32×10 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7201 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6201." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7202", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 44, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6202 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "fans and blowers", "hand tool rotors", "small precision gearboxes", "instrument spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 15 mm bore is the default general-purpose angular-contact envelope (35×11 mm); the deep-groove counterpart 6202 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7202 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7202 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7202 angular-contact bearing?", "a": "A 7202 single-row angular-contact ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 44 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7202?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7202 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7202 compare with a deep-groove 6202?", "a": "Both share the 15×35×11 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7202 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6202." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7203", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 63, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6203 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "hand tool rotors", "small precision gearboxes", "instrument spindles", "miniature pump rotors" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 17 mm bore is the default general-purpose angular-contact envelope (40×12 mm); the deep-groove counterpart 6203 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7203 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7203 where a deep-groove 6203 would do: same 17×40×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7203 angular-contact bearing?", "a": "A 7203 single-row angular-contact ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 63 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7203?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7203 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7203 compare with a deep-groove 6203?", "a": "Both share the 17×40×12 mm ISO 15 envelope (11.5 mm radial section), but the angular-contact 7203 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6203." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7204", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 101, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6204 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 20 mm bore is the default general-purpose angular-contact envelope (47×14 mm); the deep-groove counterpart 6204 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7204 where a deep-groove 6204 would do: same 20×47×14 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7204 angular-contact bearing?", "a": "A 7204 single-row angular-contact ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 101 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7204 bore code work?", "a": "The last two digits of 7204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, shared with the 6204 deep-groove envelope." }, { "q": "What is the contact angle of 7204?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7204 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7204 compare with a deep-groove 6204?", "a": "Both share the 20×47×14 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7204 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6204." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7205", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6205 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 25 mm bore is the default general-purpose angular-contact envelope (52×15 mm); the deep-groove counterpart 6205 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7205 angular-contact bearing?", "a": "A 7205 single-row angular-contact ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 125 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7205 bore code work?", "a": "The last two digits of 7205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6205 deep-groove envelope." }, { "q": "What is the contact angle of 7205?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7205 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7205 compare with a deep-groove 6205?", "a": "Both share the 25×52×15 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7205 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6205." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7206", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6206 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 30 mm bore is the default general-purpose angular-contact envelope (62×16 mm); the deep-groove counterpart 6206 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7206 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7206 angular-contact bearing?", "a": "A 7206 single-row angular-contact ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 189 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7206 bore code work?", "a": "The last two digits of 7206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6206 deep-groove envelope." }, { "q": "What is the contact angle of 7206?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7206 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7206 compare with a deep-groove 6206?", "a": "Both share the 30×62×16 mm ISO 15 envelope (16.0 mm radial section), but the angular-contact 7206 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6206." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7207", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 270, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6207 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 35 mm bore is the default general-purpose angular-contact envelope (72×17 mm); the deep-groove counterpart 6207 shares the envelope but is not a drop-in swap for combined-load duty.", "A single 7207 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7207 angular-contact bearing?", "a": "A 7207 single-row angular-contact ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 270 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7207 bore code work?", "a": "The last two digits of 7207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, shared with the 6207 deep-groove envelope." }, { "q": "What is the contact angle of 7207?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7207 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7207 compare with a deep-groove 6207?", "a": "Both share the 35×72×17 mm ISO 15 envelope (18.5 mm radial section), but the angular-contact 7207 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6207." } ], "cross_ref": [ { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7208", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6208 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 40 mm bore is the default general-purpose angular-contact envelope (80×18 mm); the deep-groove counterpart 6208 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7208 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7208 angular-contact bearing?", "a": "A 7208 single-row angular-contact ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 346 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7208 bore code work?", "a": "The last two digits of 7208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6208 deep-groove envelope." }, { "q": "What is the contact angle of 7208?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7208 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7208 compare with a deep-groove 6208?", "a": "Both share the 40×80×18 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7208 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6208." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7209", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 396, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6209 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 45 mm bore is the default general-purpose angular-contact envelope (85×19 mm); the deep-groove counterpart 6209 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7209 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7209 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7209 angular-contact bearing?", "a": "A 7209 single-row angular-contact ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 396 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7209 bore code work?", "a": "The last two digits of 7209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6209 deep-groove envelope." }, { "q": "What is the contact angle of 7209?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7209 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7209 compare with a deep-groove 6209?", "a": "Both share the 45×85×19 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7209 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6209." } ], "cross_ref": [ { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7210", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 449, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6210 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 50 mm bore is the default general-purpose angular-contact envelope (90×20 mm); the deep-groove counterpart 6210 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7210 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7210 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7210 angular-contact bearing?", "a": "A 7210 single-row angular-contact ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 449 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7210 bore code work?", "a": "The last two digits of 7210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6210 deep-groove envelope." }, { "q": "What is the contact angle of 7210?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7210 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7210 compare with a deep-groove 6210?", "a": "Both share the 50×90×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7210 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6210." } ], "cross_ref": [ { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7211", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 587, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6211 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 55 mm bore is the default general-purpose angular-contact envelope (100×21 mm); the deep-groove counterpart 6211 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7211 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7211 where a deep-groove 6211 would do: same 55×100×21 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7211 angular-contact bearing?", "a": "A 7211 single-row angular-contact ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 587 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7211 bore code work?", "a": "The last two digits of 7211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6211 deep-groove envelope." }, { "q": "What is the contact angle of 7211?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7211 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7211 compare with a deep-groove 6211?", "a": "Both share the 55×100×21 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7211 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6211." } ], "cross_ref": [ { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7212", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 749, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6212 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 60 mm bore is the default general-purpose angular-contact envelope (110×22 mm); the deep-groove counterpart 6212 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7212 where a deep-groove 6212 would do: same 60×110×22 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7212 angular-contact bearing?", "a": "A 7212 single-row angular-contact ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 749 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7212 bore code work?", "a": "The last two digits of 7212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6212 deep-groove envelope." }, { "q": "What is the contact angle of 7212?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7212 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7212 compare with a deep-groove 6212?", "a": "Both share the 60×110×22 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7212 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6212." } ], "cross_ref": [ { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7213", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 938, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6213 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 65 mm bore is the default general-purpose angular-contact envelope (120×23 mm); the deep-groove counterpart 6213 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7213 angular-contact bearing?", "a": "A 7213 single-row angular-contact ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 938 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7213 bore code work?", "a": "The last two digits of 7213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6213 deep-groove envelope." }, { "q": "What is the contact angle of 7213?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7213 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7213 compare with a deep-groove 6213?", "a": "Both share the 65×120×23 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7213 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7214", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1032, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6214 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 70 mm bore is the default general-purpose angular-contact envelope (125×24 mm); the deep-groove counterpart 6214 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7214 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7214 angular-contact bearing?", "a": "A 7214 single-row angular-contact ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1032 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7214 bore code work?", "a": "The last two digits of 7214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6214 deep-groove envelope." }, { "q": "What is the contact angle of 7214?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7214 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7214 compare with a deep-groove 6214?", "a": "Both share the 70×125×24 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7214 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6214." } ], "cross_ref": [ { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7215", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1130, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6215 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 75 mm bore is the default general-purpose angular-contact envelope (130×25 mm); the deep-groove counterpart 6215 shares the envelope but is not a drop-in swap for combined-load duty.", "A single 7215 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7215 angular-contact bearing?", "a": "A 7215 single-row angular-contact ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1130 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7215 bore code work?", "a": "The last two digits of 7215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6215 deep-groove envelope." }, { "q": "What is the contact angle of 7215?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7215 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7215 compare with a deep-groove 6215?", "a": "Both share the 75×130×25 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7215 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6215." } ], "cross_ref": [ { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7216", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1375, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6216 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 80 mm bore is the default general-purpose angular-contact envelope (140×26 mm); the deep-groove counterpart 6216 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7216 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7216 angular-contact bearing?", "a": "A 7216 single-row angular-contact ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1375 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7216 bore code work?", "a": "The last two digits of 7216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, shared with the 6216 deep-groove envelope." }, { "q": "What is the contact angle of 7216?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7216 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7216 compare with a deep-groove 6216?", "a": "Both share the 80×140×26 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7216 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6216." } ], "cross_ref": [ { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7217", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1714, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6217 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 85 mm bore is the default general-purpose angular-contact envelope (150×28 mm); the deep-groove counterpart 6217 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7217 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7217 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7217 angular-contact bearing?", "a": "A 7217 single-row angular-contact ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1714 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7217 bore code work?", "a": "The last two digits of 7217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, shared with the 6217 deep-groove envelope." }, { "q": "What is the contact angle of 7217?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7217 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7217 compare with a deep-groove 6217?", "a": "Both share the 85×150×28 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7217 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6217." } ], "cross_ref": [ { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7218", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2104, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6218 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 90 mm bore is the default general-purpose angular-contact envelope (160×30 mm); the deep-groove counterpart 6218 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7218 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7218 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7218 angular-contact bearing?", "a": "A 7218 single-row angular-contact ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2104 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7218 bore code work?", "a": "The last two digits of 7218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, shared with the 6218 deep-groove envelope." }, { "q": "What is the contact angle of 7218?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7218 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7218 compare with a deep-groove 6218?", "a": "Both share the 90×160×30 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7218 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6218." } ], "cross_ref": [ { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7219", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2549, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6219 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 95 mm bore is the default general-purpose angular-contact envelope (170×32 mm); the deep-groove counterpart 6219 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7219 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7219 where a deep-groove 6219 would do: same 95×170×32 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7219 angular-contact bearing?", "a": "A 7219 single-row angular-contact ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2549 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7219 bore code work?", "a": "The last two digits of 7219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, shared with the 6219 deep-groove envelope." }, { "q": "What is the contact angle of 7219?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7219 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7219 compare with a deep-groove 6219?", "a": "Both share the 95×170×32 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7219 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6219." } ], "cross_ref": [ { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7220", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3052, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6220 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 100 mm bore is the default general-purpose angular-contact envelope (180×34 mm); the deep-groove counterpart 6220 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7220 where a deep-groove 6220 would do: same 100×180×34 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7220 angular-contact bearing?", "a": "A 7220 single-row angular-contact ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3052 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7220 bore code work?", "a": "The last two digits of 7220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, shared with the 6220 deep-groove envelope." }, { "q": "What is the contact angle of 7220?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7220 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7220 compare with a deep-groove 6220?", "a": "Both share the 100×180×34 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7220 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6220." } ], "cross_ref": [ { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7221", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3618, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6221 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 105 mm bore is the default general-purpose angular-contact envelope (190×36 mm); the deep-groove counterpart 6221 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7221 angular-contact bearing?", "a": "A 7221 single-row angular-contact ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3618 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7221 bore code work?", "a": "The last two digits of 7221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, shared with the 6221 deep-groove envelope." }, { "q": "What is the contact angle of 7221?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7221 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7221 compare with a deep-groove 6221?", "a": "Both share the 105×190×36 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7221 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7222", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4249, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6222 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 110 mm bore is the default general-purpose angular-contact envelope (200×38 mm); the deep-groove counterpart 6222 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7222 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7222 angular-contact bearing?", "a": "A 7222 single-row angular-contact ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4249 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7222 bore code work?", "a": "The last two digits of 7222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, shared with the 6222 deep-groove envelope." }, { "q": "What is the contact angle of 7222?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7222 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7222 compare with a deep-groove 6222?", "a": "Both share the 110×200×38 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7222 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6222." } ], "cross_ref": [ { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7300", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 50, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6300 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "fans and blowers", "hand tool rotors", "small precision gearboxes", "instrument spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier balls also trade away speed versus a 7200 angular contact.", "Angular-contact 7300 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7300 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7300 angular-contact bearing?", "a": "A 7300 single-row angular-contact ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 50 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7300?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7300 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7300 compare with a deep-groove 6300?", "a": "Both share the 10×35×11 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7300 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6300." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7301", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 59, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6301 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "hand tool rotors", "small precision gearboxes", "instrument spindles", "miniature pump rotors" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier balls also trade away speed versus a 7201 angular contact.", "Preload class matters: a 7301 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7301 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7301 angular-contact bearing?", "a": "A 7301 single-row angular-contact ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 59 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7301?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7301 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7301 compare with a deep-groove 6301?", "a": "Both share the 12×37×12 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7301 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6301." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7302", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 80, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6302 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small precision gearboxes", "instrument spindles", "miniature pump rotors", "servo drive shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier balls also trade away speed versus a 7202 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7302 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7302 where a deep-groove 6302 would do: same 15×42×13 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7302 angular-contact bearing?", "a": "A 7302 single-row angular-contact ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 80 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7302?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7302 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7302 compare with a deep-groove 6302?", "a": "Both share the 15×42×13 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7302 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6302." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7303", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 108, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6303 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "instrument spindles", "miniature pump rotors", "servo drive shafts", "fans and blowers" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier balls also trade away speed versus a 7203 angular contact.", "Do not run a single 7303 where a deep-groove 6303 would do: same 17×47×14 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7303 angular-contact bearing?", "a": "A 7303 single-row angular-contact ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 108 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7303?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7303 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7303 compare with a deep-groove 6303?", "a": "Both share the 17×47×14 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7303 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7304", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 138, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6304 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier balls also trade away speed versus a 7204 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7304 angular-contact bearing?", "a": "A 7304 single-row angular-contact ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 138 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7304 bore code work?", "a": "The last two digits of 7304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6304 deep-groove envelope." }, { "q": "What is the contact angle of 7304?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7304 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7304 compare with a deep-groove 6304?", "a": "Both share the 20×52×15 mm ISO 15 envelope (16.0 mm radial section), but the angular-contact 7304 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6304." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7305", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 219, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6305 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier balls also trade away speed versus a 7205 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7305 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7305 angular-contact bearing?", "a": "A 7305 single-row angular-contact ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 219 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7305 bore code work?", "a": "The last two digits of 7305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, shared with the 6305 deep-groove envelope." }, { "q": "What is the contact angle of 7305?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7305 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7305 compare with a deep-groove 6305?", "a": "Both share the 25×62×17 mm ISO 15 envelope (18.5 mm radial section), but the angular-contact 7305 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6305." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7306", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 326, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6306 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier balls also trade away speed versus a 7206 angular contact.", "A single 7306 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7306 angular-contact bearing?", "a": "A 7306 single-row angular-contact ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 326 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7306 bore code work?", "a": "The last two digits of 7306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6306 deep-groove envelope." }, { "q": "What is the contact angle of 7306?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7306 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7306 compare with a deep-groove 6306?", "a": "Both share the 30×72×19 mm ISO 15 envelope (21.0 mm radial section), but the angular-contact 7306 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6306." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7307", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 436, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6307 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier balls also trade away speed versus a 7207 angular contact.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7307 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7307 angular-contact bearing?", "a": "A 7307 single-row angular-contact ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 436 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7307 bore code work?", "a": "The last two digits of 7307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6307 deep-groove envelope." }, { "q": "What is the contact angle of 7307?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7307 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7307 compare with a deep-groove 6307?", "a": "Both share the 35×80×21 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7307 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6307." } ], "cross_ref": [ { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7308", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 599, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6308 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier balls also trade away speed versus a 7208 angular contact.", "Angular-contact 7308 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7308 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7308 angular-contact bearing?", "a": "A 7308 single-row angular-contact ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 599 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7308 bore code work?", "a": "The last two digits of 7308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6308 deep-groove envelope." }, { "q": "What is the contact angle of 7308?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7308 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7308 compare with a deep-groove 6308?", "a": "Both share the 40×90×23 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7308 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6308." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7309", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 799, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6309 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier balls also trade away speed versus a 7209 angular contact.", "Preload class matters: a 7309 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7309 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7309 angular-contact bearing?", "a": "A 7309 single-row angular-contact ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 799 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7309 bore code work?", "a": "The last two digits of 7309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6309 deep-groove envelope." }, { "q": "What is the contact angle of 7309?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7309 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7309 compare with a deep-groove 6309?", "a": "Both share the 45×100×25 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7309 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6309." } ], "cross_ref": [ { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7310", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1039, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6310 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier balls also trade away speed versus a 7210 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7310 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7310 where a deep-groove 6310 would do: same 50×110×27 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7310 angular-contact bearing?", "a": "A 7310 single-row angular-contact ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1039 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7310 bore code work?", "a": "The last two digits of 7310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, shared with the 6310 deep-groove envelope." }, { "q": "What is the contact angle of 7310?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7310 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7310 compare with a deep-groove 6310?", "a": "Both share the 50×110×27 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7310 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6310." } ], "cross_ref": [ { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7311", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1322, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6311 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier balls also trade away speed versus a 7211 angular contact.", "Do not run a single 7311 where a deep-groove 6311 would do: same 55×120×29 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7311 angular-contact bearing?", "a": "A 7311 single-row angular-contact ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1322 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7311 bore code work?", "a": "The last two digits of 7311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, shared with the 6311 deep-groove envelope." }, { "q": "What is the contact angle of 7311?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7311 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7311 compare with a deep-groove 6311?", "a": "Both share the 55×120×29 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7311 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6311." } ], "cross_ref": [ { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7312", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1652, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6312 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier balls also trade away speed versus a 7212 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7312 angular-contact bearing?", "a": "A 7312 single-row angular-contact ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1652 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7312 bore code work?", "a": "The last two digits of 7312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, shared with the 6312 deep-groove envelope." }, { "q": "What is the contact angle of 7312?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7312 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7312 compare with a deep-groove 6312?", "a": "Both share the 60×130×31 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7312 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6312." } ], "cross_ref": [ { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7313", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2033, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6313 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier balls also trade away speed versus a 7213 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7313 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7313 angular-contact bearing?", "a": "A 7313 single-row angular-contact ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2033 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7313 bore code work?", "a": "The last two digits of 7313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, shared with the 6313 deep-groove envelope." }, { "q": "What is the contact angle of 7313?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7313 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7313 compare with a deep-groove 6313?", "a": "Both share the 65×140×33 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7313 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6313." } ], "cross_ref": [ { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7314", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2469, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6314 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier balls also trade away speed versus a 7214 angular contact.", "A single 7314 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7314 angular-contact bearing?", "a": "A 7314 single-row angular-contact ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2469 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7314 bore code work?", "a": "The last two digits of 7314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, shared with the 6314 deep-groove envelope." }, { "q": "What is the contact angle of 7314?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7314 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7314 compare with a deep-groove 6314?", "a": "Both share the 70×150×35 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7314 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6314." } ], "cross_ref": [ { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7315", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2962, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6315 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier balls also trade away speed versus a 7215 angular contact.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7315 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7315 angular-contact bearing?", "a": "A 7315 single-row angular-contact ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2962 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7315 bore code work?", "a": "The last two digits of 7315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, shared with the 6315 deep-groove envelope." }, { "q": "What is the contact angle of 7315?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7315 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7315 compare with a deep-groove 6315?", "a": "Both share the 75×160×37 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7315 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6315." } ], "cross_ref": [ { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7316", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3517, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6316 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier balls also trade away speed versus a 7216 angular contact.", "Angular-contact 7316 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7316 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7316 angular-contact bearing?", "a": "A 7316 single-row angular-contact ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3517 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7316 bore code work?", "a": "The last two digits of 7316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, shared with the 6316 deep-groove envelope." }, { "q": "What is the contact angle of 7316?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7316 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7316 compare with a deep-groove 6316?", "a": "Both share the 80×170×39 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7316 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6316." } ], "cross_ref": [ { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7317", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6317 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier balls also trade away speed versus a 7217 angular contact.", "Preload class matters: a 7317 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7317 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7317 angular-contact bearing?", "a": "A 7317 single-row angular-contact ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7317 bore code work?", "a": "The last two digits of 7317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, shared with the 6317 deep-groove envelope." }, { "q": "What is the contact angle of 7317?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7317 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7317 compare with a deep-groove 6317?", "a": "Both share the 85×180×41 mm ISO 15 envelope (47.5 mm radial section), but the angular-contact 7317 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6317." } ], "cross_ref": [ { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7318", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4825, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6318 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier balls also trade away speed versus a 7218 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7318 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7318 where a deep-groove 6318 would do: same 90×190×43 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7318 angular-contact bearing?", "a": "A 7318 single-row angular-contact ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4825 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7318 bore code work?", "a": "The last two digits of 7318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, shared with the 6318 deep-groove envelope." }, { "q": "What is the contact angle of 7318?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7318 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7318 compare with a deep-groove 6318?", "a": "Both share the 90×190×43 mm ISO 15 envelope (50.0 mm radial section), but the angular-contact 7318 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6318." } ], "cross_ref": [ { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7319", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 5586, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6319 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier balls also trade away speed versus a 7219 angular contact.", "Do not run a single 7319 where a deep-groove 6319 would do: same 95×200×45 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7319 angular-contact bearing?", "a": "A 7319 single-row angular-contact ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 5586 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7319 bore code work?", "a": "The last two digits of 7319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, shared with the 6319 deep-groove envelope." }, { "q": "What is the contact angle of 7319?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7319 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7319 compare with a deep-groove 6319?", "a": "Both share the 95×200×45 mm ISO 15 envelope (52.5 mm radial section), but the angular-contact 7319 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6319." } ], "cross_ref": [ { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7320", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 6823, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6320 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier balls also trade away speed versus a 7220 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7320 angular-contact bearing?", "a": "A 7320 single-row angular-contact ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 6823 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7320 bore code work?", "a": "The last two digits of 7320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, shared with the 6320 deep-groove envelope." }, { "q": "What is the contact angle of 7320?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7320 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7320 compare with a deep-groove 6320?", "a": "Both share the 100×215×47 mm ISO 15 envelope (57.5 mm radial section), but the angular-contact 7320 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6320." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7321", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 7776, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6321 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier balls also trade away speed versus a 7221 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7321 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7321 angular-contact bearing?", "a": "A 7321 single-row angular-contact ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 7776 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7321 bore code work?", "a": "The last two digits of 7321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, shared with the 6321 deep-groove envelope." }, { "q": "What is the contact angle of 7321?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7321 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7321 compare with a deep-groove 6321?", "a": "Both share the 105×225×49 mm ISO 15 envelope (60.0 mm radial section), but the angular-contact 7321 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7322", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 9117, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6322 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier balls also trade away speed versus a 7222 angular contact.", "A single 7322 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7322 angular-contact bearing?", "a": "A 7322 single-row angular-contact ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 9117 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7322 bore code work?", "a": "The last two digits of 7322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, shared with the 6322 deep-groove envelope." }, { "q": "What is the contact angle of 7322?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7322 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7322 compare with a deep-groove 6322?", "a": "Both share the 110×240×50 mm ISO 15 envelope (65.0 mm radial section), but the angular-contact 7322 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6322." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7000", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 10, "D_mm": 26, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6000 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small precision gearboxes", "instrument spindles", "miniature pump rotors", "servo drive shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 10 mm bore uses a 26 mm OD; axial capacity is lower than a 7200, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7000 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7000 angular-contact bearing?", "a": "A 7000 single-row angular-contact ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7000?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7000 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7000 compare with a deep-groove 6000?", "a": "Both share the 10×26×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7000 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6000." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7001", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 12, "D_mm": 28, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6001 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "instrument spindles", "miniature pump rotors", "servo drive shafts", "fans and blowers" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 12 mm bore uses a 28 mm OD; axial capacity is lower than a 7201, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7001 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7001 angular-contact bearing?", "a": "A 7001 single-row angular-contact ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7001?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7001 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7001 compare with a deep-groove 6001?", "a": "Both share the 12×28×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7001 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6001." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7002", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 15, "D_mm": 32, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 29, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6002 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "miniature pump rotors", "servo drive shafts", "fans and blowers", "hand tool rotors" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 15 mm bore uses a 32 mm OD; axial capacity is lower than a 7202, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7002 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7002 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7002 angular-contact bearing?", "a": "A 7002 single-row angular-contact ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 29 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7002?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7002 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7002 compare with a deep-groove 6002?", "a": "Both share the 15×32×9 mm ISO 15 envelope (8.5 mm radial section), but the angular-contact 7002 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6002." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7003", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 17, "D_mm": 35, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6003 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo drive shafts", "fans and blowers", "hand tool rotors", "small precision gearboxes" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 17 mm bore uses a 35 mm OD; axial capacity is lower than a 7203, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7003 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7003 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7003 angular-contact bearing?", "a": "A 7003 single-row angular-contact ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7003?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7003 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7003 compare with a deep-groove 6003?", "a": "Both share the 17×35×10 mm ISO 15 envelope (9.0 mm radial section), but the angular-contact 7003 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6003." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7004", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 66, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6004 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 20 mm bore uses a 42 mm OD; axial capacity is lower than a 7204, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7004 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7004 where a deep-groove 6004 would do: same 20×42×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7004 angular-contact bearing?", "a": "A 7004 single-row angular-contact ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 66 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7004 bore code work?", "a": "The last two digits of 7004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6004 deep-groove envelope." }, { "q": "What is the contact angle of 7004?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7004 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7004 compare with a deep-groove 6004?", "a": "Both share the 20×42×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7004 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6004." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7005", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 76, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6005 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 25 mm bore uses a 47 mm OD; axial capacity is lower than a 7205, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7005 where a deep-groove 6005 would do: same 25×47×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7005 angular-contact bearing?", "a": "A 7005 single-row angular-contact ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 76 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7005 bore code work?", "a": "The last two digits of 7005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6005 deep-groove envelope." }, { "q": "What is the contact angle of 7005?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7005 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7005 compare with a deep-groove 6005?", "a": "Both share the 25×47×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7005 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6005." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7006", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 111, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6006 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 30 mm bore uses a 55 mm OD; axial capacity is lower than a 7206, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7006 angular-contact bearing?", "a": "A 7006 single-row angular-contact ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 111 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7006 bore code work?", "a": "The last two digits of 7006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 6006 deep-groove envelope." }, { "q": "What is the contact angle of 7006?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7006 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7006 compare with a deep-groove 6006?", "a": "Both share the 30×55×13 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7006 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6006." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7007", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 147, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6007 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 35 mm bore uses a 62 mm OD; axial capacity is lower than a 7207, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7007 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7007 angular-contact bearing?", "a": "A 7007 single-row angular-contact ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 147 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7007 bore code work?", "a": "The last two digits of 7007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, shared with the 6007 deep-groove envelope." }, { "q": "What is the contact angle of 7007?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7007 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7007 compare with a deep-groove 6007?", "a": "Both share the 35×62×14 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7007 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6007." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7008", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 182, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6008 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 40 mm bore uses a 68 mm OD; axial capacity is lower than a 7208, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7008 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7008 angular-contact bearing?", "a": "A 7008 single-row angular-contact ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 182 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7008 bore code work?", "a": "The last two digits of 7008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6008 deep-groove envelope." }, { "q": "What is the contact angle of 7008?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7008 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7008 compare with a deep-groove 6008?", "a": "Both share the 40×68×15 mm ISO 15 envelope (14.0 mm radial section), but the angular-contact 7008 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6008." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7009", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 231, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6009 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 45 mm bore uses a 75 mm OD; axial capacity is lower than a 7209, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7009 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7009 angular-contact bearing?", "a": "A 7009 single-row angular-contact ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 231 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7009 bore code work?", "a": "The last two digits of 7009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6009 deep-groove envelope." }, { "q": "What is the contact angle of 7009?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7009 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7009 compare with a deep-groove 6009?", "a": "Both share the 45×75×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7009 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6009." } ], "cross_ref": [ { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7010", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 250, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6010 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 50 mm bore uses a 80 mm OD; axial capacity is lower than a 7210, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7010 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7010 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7010 angular-contact bearing?", "a": "A 7010 single-row angular-contact ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 250 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7010 bore code work?", "a": "The last two digits of 7010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6010 deep-groove envelope." }, { "q": "What is the contact angle of 7010?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7010 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7010 compare with a deep-groove 6010?", "a": "Both share the 50×80×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7010 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6010." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7011", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 366, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6011 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 55 mm bore uses a 90 mm OD; axial capacity is lower than a 7211, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7011 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7011 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7011 angular-contact bearing?", "a": "A 7011 single-row angular-contact ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 366 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7011 bore code work?", "a": "The last two digits of 7011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6011 deep-groove envelope." }, { "q": "What is the contact angle of 7011?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7011 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7011 compare with a deep-groove 6011?", "a": "Both share the 55×90×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7011 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6011." } ], "cross_ref": [ { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7012", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 391, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6012 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 60 mm bore uses a 95 mm OD; axial capacity is lower than a 7212, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7012 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7012 where a deep-groove 6012 would do: same 60×95×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7012 angular-contact bearing?", "a": "A 7012 single-row angular-contact ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 391 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7012 bore code work?", "a": "The last two digits of 7012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6012 deep-groove envelope." }, { "q": "What is the contact angle of 7012?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7012 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7012 compare with a deep-groove 6012?", "a": "Both share the 60×95×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7012 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6012." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7013", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 417, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6013 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 65 mm bore uses a 100 mm OD; axial capacity is lower than a 7213, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7013 where a deep-groove 6013 would do: same 65×100×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7013 angular-contact bearing?", "a": "A 7013 single-row angular-contact ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 417 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7013 bore code work?", "a": "The last two digits of 7013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6013 deep-groove envelope." }, { "q": "What is the contact angle of 7013?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7013 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7013 compare with a deep-groove 6013?", "a": "Both share the 65×100×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7013 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6013." } ], "cross_ref": [ { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7014", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 577, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6014 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 70 mm bore uses a 110 mm OD; axial capacity is lower than a 7214, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7014 angular-contact bearing?", "a": "A 7014 single-row angular-contact ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 577 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7014 bore code work?", "a": "The last two digits of 7014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6014 deep-groove envelope." }, { "q": "What is the contact angle of 7014?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7014 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7014 compare with a deep-groove 6014?", "a": "Both share the 70×110×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7014 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6014." } ], "cross_ref": [ { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7015", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 609, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6015 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 75 mm bore uses a 115 mm OD; axial capacity is lower than a 7215, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7015 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7015 angular-contact bearing?", "a": "A 7015 single-row angular-contact ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 609 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7015 bore code work?", "a": "The last two digits of 7015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6015 deep-groove envelope." }, { "q": "What is the contact angle of 7015?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7015 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7015 compare with a deep-groove 6015?", "a": "Both share the 75×115×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7015 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6015." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7016", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 813, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6016 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 80 mm bore uses a 125 mm OD; axial capacity is lower than a 7216, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7016 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7016 angular-contact bearing?", "a": "A 7016 single-row angular-contact ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 813 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7016 bore code work?", "a": "The last two digits of 7016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6016 deep-groove envelope." }, { "q": "What is the contact angle of 7016?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7016 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7016 compare with a deep-groove 6016?", "a": "Both share the 80×125×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7016 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6016." } ], "cross_ref": [ { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7017", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 853, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6017 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 85 mm bore uses a 130 mm OD; axial capacity is lower than a 7217, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7017 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7017 angular-contact bearing?", "a": "A 7017 single-row angular-contact ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 853 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7017 bore code work?", "a": "The last two digits of 7017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6017 deep-groove envelope." }, { "q": "What is the contact angle of 7017?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7017 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7017 compare with a deep-groove 6017?", "a": "Both share the 85×130×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7017 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6017." } ], "cross_ref": [ { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7018", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1106, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6018 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 90 mm bore uses a 140 mm OD; axial capacity is lower than a 7218, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7018 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7018 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7018 angular-contact bearing?", "a": "A 7018 single-row angular-contact ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1106 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7018 bore code work?", "a": "The last two digits of 7018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6018 deep-groove envelope." }, { "q": "What is the contact angle of 7018?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7018 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7018 compare with a deep-groove 6018?", "a": "Both share the 90×140×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7018 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6018." } ], "cross_ref": [ { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7019", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1154, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6019 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 95 mm bore uses a 145 mm OD; axial capacity is lower than a 7219, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7019 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7019 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7019 angular-contact bearing?", "a": "A 7019 single-row angular-contact ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1154 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7019 bore code work?", "a": "The last two digits of 7019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6019 deep-groove envelope." }, { "q": "What is the contact angle of 7019?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7019 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7019 compare with a deep-groove 6019?", "a": "Both share the 95×145×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7019 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6019." } ], "cross_ref": [ { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7020", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6020 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 100 mm bore uses a 150 mm OD; axial capacity is lower than a 7220, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7020 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7020 where a deep-groove 6020 would do: same 100×150×24 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7020 angular-contact bearing?", "a": "A 7020 single-row angular-contact ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7020 bore code work?", "a": "The last two digits of 7020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6020 deep-groove envelope." }, { "q": "What is the contact angle of 7020?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7020 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7020 compare with a deep-groove 6020?", "a": "Both share the 100×150×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7020 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6020." } ], "cross_ref": [ { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7021", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 105, "D_mm": 160, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1519, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6021 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 105 mm bore uses a 160 mm OD; axial capacity is lower than a 7221, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7021 where a deep-groove 6021 would do: same 105×160×26 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7021 angular-contact bearing?", "a": "A 7021 single-row angular-contact ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1519 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7021 bore code work?", "a": "The last two digits of 7021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, shared with the 6021 deep-groove envelope." }, { "q": "What is the contact angle of 7021?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7021 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7021 compare with a deep-groove 6021?", "a": "Both share the 105×160×26 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7021 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6021." } ], "cross_ref": [ { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7022", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 110, "D_mm": 170, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1885, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6022 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 110 mm bore uses a 170 mm OD; axial capacity is lower than a 7222, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7022 angular-contact bearing?", "a": "A 7022 single-row angular-contact ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1885 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7022 bore code work?", "a": "The last two digits of 7022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, shared with the 6022 deep-groove envelope." }, { "q": "What is the contact angle of 7022?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7022 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7022 compare with a deep-groove 6022?", "a": "Both share the 110×170×28 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7022 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6022." } ], "cross_ref": [ { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7404", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 364, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6404 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 20 mm bore (72 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7404 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7404 angular-contact bearing?", "a": "A 7404 single-row angular-contact ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 364 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7404 bore code work?", "a": "The last two digits of 7404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6404 deep-groove envelope." }, { "q": "What is the contact angle of 7404?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7404 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7404 compare with a deep-groove 6404?", "a": "Both share the 20×72×19 mm ISO 15 envelope (26.0 mm radial section), but the angular-contact 7404 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6404." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7405", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 486, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6405 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 25 mm bore (80 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7405 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7405 angular-contact bearing?", "a": "A 7405 single-row angular-contact ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 486 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7405 bore code work?", "a": "The last two digits of 7405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6405 deep-groove envelope." }, { "q": "What is the contact angle of 7405?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7405 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7405 compare with a deep-groove 6405?", "a": "Both share the 25×80×21 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7405 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6405." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7406", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 664, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6406 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 30 mm bore (90 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7406 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7406 angular-contact bearing?", "a": "A 7406 single-row angular-contact ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 664 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7406 bore code work?", "a": "The last two digits of 7406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6406 deep-groove envelope." }, { "q": "What is the contact angle of 7406?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7406 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7406 compare with a deep-groove 6406?", "a": "Both share the 30×90×23 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7406 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6406." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7407", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 879, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6407 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 35 mm bore (100 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Angular-contact 7407 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7407 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7407 angular-contact bearing?", "a": "A 7407 single-row angular-contact ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 879 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7407 bore code work?", "a": "The last two digits of 7407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6407 deep-groove envelope." }, { "q": "What is the contact angle of 7407?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7407 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7407 compare with a deep-groove 6407?", "a": "Both share the 35×100×25 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7407 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6407." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7408", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6408 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 40 mm bore (110 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Preload class matters: a 7408 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7408 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7408 angular-contact bearing?", "a": "A 7408 single-row angular-contact ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7408 bore code work?", "a": "The last two digits of 7408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, shared with the 6408 deep-groove envelope." }, { "q": "What is the contact angle of 7408?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7408 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7408 compare with a deep-groove 6408?", "a": "Both share the 40×110×27 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7408 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6408." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7409", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1438, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6409 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 45 mm bore (120 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7409 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7409 where a deep-groove 6409 would do: same 45×120×29 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7409 angular-contact bearing?", "a": "A 7409 single-row angular-contact ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1438 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7409 bore code work?", "a": "The last two digits of 7409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, shared with the 6409 deep-groove envelope." }, { "q": "What is the contact angle of 7409?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7409 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7409 compare with a deep-groove 6409?", "a": "Both share the 45×120×29 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7409 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6409." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7410", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1789, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6410 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 50 mm bore (130 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Do not run a single 7410 where a deep-groove 6410 would do: same 50×130×31 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7410 angular-contact bearing?", "a": "A 7410 single-row angular-contact ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1789 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7410 bore code work?", "a": "The last two digits of 7410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, shared with the 6410 deep-groove envelope." }, { "q": "What is the contact angle of 7410?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7410 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7410 compare with a deep-groove 6410?", "a": "Both share the 50×130×31 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7410 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6410." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7411", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2192, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6411 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 55 mm bore (140 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7411 angular-contact bearing?", "a": "A 7411 single-row angular-contact ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2192 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7411 bore code work?", "a": "The last two digits of 7411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, shared with the 6411 deep-groove envelope." }, { "q": "What is the contact angle of 7411?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7411 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7411 compare with a deep-groove 6411?", "a": "Both share the 55×140×33 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7411 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6411." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7412", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2651, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6412 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 60 mm bore (150 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7412 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7412 angular-contact bearing?", "a": "A 7412 single-row angular-contact ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2651 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7412 bore code work?", "a": "The last two digits of 7412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, shared with the 6412 deep-groove envelope." }, { "q": "What is the contact angle of 7412?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7412 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7412 compare with a deep-groove 6412?", "a": "Both share the 60×150×35 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7412 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6412." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7413", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6413 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 65 mm bore (160 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7413 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7413 angular-contact bearing?", "a": "A 7413 single-row angular-contact ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3169 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7413 bore code work?", "a": "The last two digits of 7413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, shared with the 6413 deep-groove envelope." }, { "q": "What is the contact angle of 7413?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7413 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7413 compare with a deep-groove 6413?", "a": "Both share the 65×160×37 mm ISO 15 envelope (47.5 mm radial section), but the angular-contact 7413 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6413." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7414", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6414 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 70 mm bore (180 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7414 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7414 angular-contact bearing?", "a": "A 7414 single-row angular-contact ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4629 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7414 bore code work?", "a": "The last two digits of 7414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, shared with the 6414 deep-groove envelope." }, { "q": "What is the contact angle of 7414?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7414 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7414 compare with a deep-groove 6414?", "a": "Both share the 70×180×42 mm ISO 15 envelope (55.0 mm radial section), but the angular-contact 7414 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6414." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71804", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61804 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7204.", "With a 6.0 mm radial section on a 20 mm bore, the 71804 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 32 mm housing.", "A single 71804 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71804 angular-contact bearing?", "a": "A 71804 single-row angular-contact ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71804 bore code work?", "a": "The last two digits of 71804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61804 deep-groove envelope." }, { "q": "What is the contact angle of 71804?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71804 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71804?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71805", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 25, "D_mm": 37, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61805 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7205.", "Draw-up on a thin-section 71805 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71805 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71805 angular-contact bearing?", "a": "A 71805 single-row angular-contact ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71805 bore code work?", "a": "The last two digits of 71805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61805 deep-groove envelope." }, { "q": "What is the contact angle of 71805?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71805 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71805 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71806", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 30, "D_mm": 42, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 24, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61806 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7206.", "The 42 mm outer ring of 71806 is only 6.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Angular-contact 71806 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71806 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71806 angular-contact bearing?", "a": "A 71806 single-row angular-contact ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 24 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71806 bore code work?", "a": "The last two digits of 71806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61806 deep-groove envelope." }, { "q": "What is the contact angle of 71806?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71806 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71806 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71806 envelope is 30×42×7 mm with a 6.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71807", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 35, "D_mm": 47, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 28, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61807 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7207.", "Pair thin-section 71807 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 6.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Preload class matters: a 71807 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71807 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71807 angular-contact bearing?", "a": "A 71807 single-row angular-contact ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 28 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71807 bore code work?", "a": "The last two digits of 71807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61807 deep-groove envelope." }, { "q": "What is the contact angle of 71807?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71807 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71807?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71808", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 40, "D_mm": 52, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 31, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61808 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7208.", "With a 6.0 mm radial section on a 40 mm bore, the 71808 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 52 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71808 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71808 where a deep-groove 61808 would do: same 40×52×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71808 angular-contact bearing?", "a": "A 71808 single-row angular-contact ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 31 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71808 bore code work?", "a": "The last two digits of 71808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61808 deep-groove envelope." }, { "q": "What is the contact angle of 71808?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71808 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71808 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71809", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 45, "D_mm": 58, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61809 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7209.", "Draw-up on a thin-section 71809 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71809 where a deep-groove 61809 would do: same 45×58×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71809 angular-contact bearing?", "a": "A 71809 single-row angular-contact ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71809 bore code work?", "a": "The last two digits of 71809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61809 deep-groove envelope." }, { "q": "What is the contact angle of 71809?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71809 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71809 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71809 envelope is 45×58×7 mm with a 6.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71810", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 50, "D_mm": 65, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 48, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61810 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7210.", "The 65 mm outer ring of 71810 is only 7.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71810 angular-contact bearing?", "a": "A 71810 single-row angular-contact ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 48 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71810 bore code work?", "a": "The last two digits of 71810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61810 deep-groove envelope." }, { "q": "What is the contact angle of 71810?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71810 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71810?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 7.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71811", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 55, "D_mm": 72, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 78, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61811 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7211.", "Pair thin-section 71811 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 8.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71811 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71811 angular-contact bearing?", "a": "A 71811 single-row angular-contact ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 78 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71811 bore code work?", "a": "The last two digits of 71811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61811 deep-groove envelope." }, { "q": "What is the contact angle of 71811?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71811 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71811 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71812", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 60, "D_mm": 78, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 100, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61812 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7212.", "With a 9.0 mm radial section on a 60 mm bore, the 71812 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 78 mm housing.", "A single 71812 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71812 angular-contact bearing?", "a": "A 71812 single-row angular-contact ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 100 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71812 bore code work?", "a": "The last two digits of 71812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61812 deep-groove envelope." }, { "q": "What is the contact angle of 71812?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71812 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71812 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71812 envelope is 60×78×10 mm with a 9.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71813", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 65, "D_mm": 85, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 120, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61813 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7213.", "Draw-up on a thin-section 71813 is lighter than on a 72/73 bearing of the same bore: a 10 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71813 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71813 angular-contact bearing?", "a": "A 71813 single-row angular-contact ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 120 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71813 bore code work?", "a": "The last two digits of 71813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61813 deep-groove envelope." }, { "q": "What is the contact angle of 71813?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71813 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71813?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71814", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 70, "D_mm": 90, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 128, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61814 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7214.", "The 90 mm outer ring of 71814 is only 10.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 10 mm-wide raceway long before the load rating is reached.", "Angular-contact 71814 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71814 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71814 angular-contact bearing?", "a": "A 71814 single-row angular-contact ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 128 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71814 bore code work?", "a": "The last two digits of 71814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61814 deep-groove envelope." }, { "q": "What is the contact angle of 71814?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71814 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71814 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 10.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71815", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 75, "D_mm": 95, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61815 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7215.", "Pair thin-section 71815 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Preload class matters: a 71815 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71815 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71815 angular-contact bearing?", "a": "A 71815 single-row angular-contact ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71815 bore code work?", "a": "The last two digits of 71815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61815 deep-groove envelope." }, { "q": "What is the contact angle of 71815?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71815 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71815 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71815 envelope is 75×95×10 mm with a 10.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71816", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 80, "D_mm": 100, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 144, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61816 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7216.", "With a 10.0 mm radial section on a 80 mm bore, the 71816 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 100 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71816 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71816 where a deep-groove 61816 would do: same 80×100×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71816 angular-contact bearing?", "a": "A 71816 single-row angular-contact ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 144 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71816 bore code work?", "a": "The last two digits of 71816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61816 deep-groove envelope." }, { "q": "What is the contact angle of 71816?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71816 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71816?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71817", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 85, "D_mm": 110, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 254, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61817 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7217.", "Draw-up on a thin-section 71817 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71817 where a deep-groove 61817 would do: same 85×110×13 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71817 angular-contact bearing?", "a": "A 71817 single-row angular-contact ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 254 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71817 bore code work?", "a": "The last two digits of 71817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61817 deep-groove envelope." }, { "q": "What is the contact angle of 71817?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71817 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71817 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71818", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 90, "D_mm": 115, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 267, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61818 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7218.", "The 115 mm outer ring of 71818 is only 12.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 13 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71818 angular-contact bearing?", "a": "A 71818 single-row angular-contact ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 267 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71818 bore code work?", "a": "The last two digits of 71818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61818 deep-groove envelope." }, { "q": "What is the contact angle of 71818?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71818 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71818 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71818 envelope is 90×115×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71819", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 95, "D_mm": 120, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 280, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61819 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7219.", "Pair thin-section 71819 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71819 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71819 angular-contact bearing?", "a": "A 71819 single-row angular-contact ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 280 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71819 bore code work?", "a": "The last two digits of 71819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61819 deep-groove envelope." }, { "q": "What is the contact angle of 71819?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71819 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71819?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71820", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 100, "D_mm": 125, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 293, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61820 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7220.", "With a 12.5 mm radial section on a 100 mm bore, the 71820 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 125 mm housing.", "A single 71820 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71820 angular-contact bearing?", "a": "A 71820 single-row angular-contact ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 293 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71820 bore code work?", "a": "The last two digits of 71820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61820 deep-groove envelope." }, { "q": "What is the contact angle of 71820?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71820 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71820 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71904", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 35, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61904 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 20 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 8.5 mm radial section on a 20 mm bore, the 71904 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 37 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71904 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71904 angular-contact bearing?", "a": "A 71904 single-row angular-contact ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 35 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71904 bore code work?", "a": "The last two digits of 71904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61904 deep-groove envelope." }, { "q": "What is the contact angle of 71904?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71904 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71904?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 9 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 8.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71905", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 41, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61905 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 25 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71905 is lighter than on a 72/73 bearing of the same bore: a 9 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71905 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71905 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71905 angular-contact bearing?", "a": "A 71905 single-row angular-contact ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 41 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71905 bore code work?", "a": "The last two digits of 71905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61905 deep-groove envelope." }, { "q": "What is the contact angle of 71905?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71905 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71905 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71906", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 47, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61906 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 30 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 47 mm outer ring of 71906 is only 8.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 9 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71906 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71906 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71906 angular-contact bearing?", "a": "A 71906 single-row angular-contact ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 47 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71906 bore code work?", "a": "The last two digits of 71906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61906 deep-groove envelope." }, { "q": "What is the contact angle of 71906?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71906 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71906 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71906 envelope is 30×47×9 mm with a 8.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71907", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61907 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (10.0 mm section height at 35 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71907 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71907 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71907 where a deep-groove 61907 would do: same 35×55×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71907 angular-contact bearing?", "a": "A 71907 single-row angular-contact ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 72 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71907 bore code work?", "a": "The last two digits of 71907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61907 deep-groove envelope." }, { "q": "What is the contact angle of 71907?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71907 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71907?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71908", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 108, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61908 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.0 mm section height at 40 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 11.0 mm radial section on a 40 mm bore, the 71908 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 62 mm housing.", "Do not run a single 71908 where a deep-groove 61908 would do: same 40×62×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71908 angular-contact bearing?", "a": "A 71908 single-row angular-contact ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 108 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71908 bore code work?", "a": "The last two digits of 71908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61908 deep-groove envelope." }, { "q": "What is the contact angle of 71908?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71908 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71908 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 11.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71909", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61909 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.5 mm section height at 45 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71909 is lighter than on a 72/73 bearing of the same bore: a 12 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71909 angular-contact bearing?", "a": "A 71909 single-row angular-contact ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 125 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71909 bore code work?", "a": "The last two digits of 71909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61909 deep-groove envelope." }, { "q": "What is the contact angle of 71909?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71909 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71909 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71909 envelope is 45×68×12 mm with a 11.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71910", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 129, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61910 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (11.0 mm section height at 50 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 72 mm outer ring of 71910 is only 11.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 12 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71910 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71910 angular-contact bearing?", "a": "A 71910 single-row angular-contact ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 129 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71910 bore code work?", "a": "The last two digits of 71910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61910 deep-groove envelope." }, { "q": "What is the contact angle of 71910?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71910 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71910?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 12 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 11.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71911", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 176, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61911 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 55 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71911 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "A single 71911 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71911 angular-contact bearing?", "a": "A 71911 single-row angular-contact ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 176 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71911 bore code work?", "a": "The last two digits of 71911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61911 deep-groove envelope." }, { "q": "What is the contact angle of 71911?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71911 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71911 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71912", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 60, "D_mm": 85, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61912 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 60 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 12.5 mm radial section on a 60 mm bore, the 71912 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 85 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71912 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71912 angular-contact bearing?", "a": "A 71912 single-row angular-contact ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 189 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71912 bore code work?", "a": "The last two digits of 71912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61912 deep-groove envelope." }, { "q": "What is the contact angle of 71912?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71912 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71912 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71912 envelope is 60×85×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71913", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 65, "D_mm": 90, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61913 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 65 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71913 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71913 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71913 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71913 angular-contact bearing?", "a": "A 71913 single-row angular-contact ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71913 bore code work?", "a": "The last two digits of 71913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61913 deep-groove envelope." }, { "q": "What is the contact angle of 71913?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71913 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71913?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71914", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 70, "D_mm": 100, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 327, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61914 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 70 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 100 mm outer ring of 71914 is only 15.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 16 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71914 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71914 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71914 angular-contact bearing?", "a": "A 71914 single-row angular-contact ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 327 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71914 bore code work?", "a": "The last two digits of 71914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61914 deep-groove envelope." }, { "q": "What is the contact angle of 71914?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71914 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71914 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 15.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71915", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 75, "D_mm": 105, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61915 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 75 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71915 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 15.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71915 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71915 where a deep-groove 61915 would do: same 75×105×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71915 angular-contact bearing?", "a": "A 71915 single-row angular-contact ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 346 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71915 bore code work?", "a": "The last two digits of 71915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61915 deep-groove envelope." }, { "q": "What is the contact angle of 71915?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71915 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71915 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71915 envelope is 75×105×16 mm with a 15.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71916", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 80, "D_mm": 110, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 365, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61916 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (15.0 mm section height at 80 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 15.0 mm radial section on a 80 mm bore, the 71916 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 110 mm housing.", "Do not run a single 71916 where a deep-groove 61916 would do: same 80×110×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71916 angular-contact bearing?", "a": "A 71916 single-row angular-contact ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 365 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71916 bore code work?", "a": "The last two digits of 71916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61916 deep-groove envelope." }, { "q": "What is the contact angle of 71916?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71916 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71916?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 16 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 15.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71917", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 518, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61917 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 85 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71917 is lighter than on a 72/73 bearing of the same bore: a 18 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71917 angular-contact bearing?", "a": "A 71917 single-row angular-contact ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 518 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71917 bore code work?", "a": "The last two digits of 71917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61917 deep-groove envelope." }, { "q": "What is the contact angle of 71917?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71917 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71917 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 17.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71918", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 543, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61918 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 90 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 125 mm outer ring of 71918 is only 17.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 18 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71918 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71918 angular-contact bearing?", "a": "A 71918 single-row angular-contact ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 543 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71918 bore code work?", "a": "The last two digits of 71918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61918 deep-groove envelope." }, { "q": "What is the contact angle of 71918?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71918 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71918 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71918 envelope is 90×125×18 mm with a 17.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71919", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 95, "D_mm": 130, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 568, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61919 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 95 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71919 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 17.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "A single 71919 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71919 angular-contact bearing?", "a": "A 71919 single-row angular-contact ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 568 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71919 bore code work?", "a": "The last two digits of 71919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61919 deep-groove envelope." }, { "q": "What is the contact angle of 71919?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71919 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71919?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 18 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 17.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71920", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 769, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61920 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (20.0 mm section height at 100 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 20.0 mm radial section on a 100 mm bore, the 71920 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 140 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71920 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71920 angular-contact bearing?", "a": "A 71920 single-row angular-contact ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 769 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71920 bore code work?", "a": "The last two digits of 71920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 61920 deep-groove envelope." }, { "q": "What is the contact angle of 71920?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71920 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71920 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 20.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "NU204", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 101, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU204 are bore code 04 = 20 mm (code × 5 from 04 upward). The ISO 15 envelope is 47 mm outside diameter and 14 mm width — 0.787 × 1.85 × 0.551 in, with a 13.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "textile and packaging machinery rolls", "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "At 20 mm bore the small NU204 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU2 light series at 20 mm bore (47×14 mm) is the default gearbox cylindrical row; on the same bore an NU304 is larger with a much higher rating — do not replace a failed NU304 with an NU204 without re-rating L10 life.", "Before fitting NU204, machine the 20 mm shaft seat and 47 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 13.5 mm radial section.", "With a separable NU204, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU204 with the shaft turning so fresh grease or oil reaches the full 14 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 20 mm bore starved.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 20 mm inner ring home through the rollers brinells the 47 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 20 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU204 cylindrical roller bearing?", "a": "An NU204 single-row cylindrical roller bearing per ISO 15 has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), a 13.5 mm radial section and roughly 101 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU204 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 04: 04 × 5 = 20 mm. The 47 mm OD and 14 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU204) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU204 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU204E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 20×47×14 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU204E", "NU204-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU205", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU205 are bore code 05 = 25 mm (code × 5 from 04 upward). The ISO 15 envelope is 52 mm outside diameter and 15 mm width — 0.984 × 2.047 × 0.591 in, with a 13.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "At 25 mm bore the small NU205 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU2 light series at 25 mm bore (52×15 mm) is the default gearbox cylindrical row; on the same bore an NU305 is larger with a much higher rating — do not replace a failed NU305 with an NU205 without re-rating L10 life.", "Check the shoulder geometry for NU205: a generous fillet on the 25 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 52 mm, 15 mm-wide housing bore.", "Large NU205 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 25 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 15 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU205 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 25 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Order clearance for the fit: a rotating interference inner ring on a 25 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU205; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU205 cylindrical roller bearing?", "a": "An NU205 single-row cylindrical roller bearing per ISO 15 has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), a 13.5 mm radial section and roughly 125 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU205 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 05: 05 × 5 = 25 mm. The 52 mm OD and 15 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU205) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU205 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU205E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 25×52×15 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU205E", "NU205-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU206", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU206 are bore code 06 = 30 mm (code × 5 from 04 upward). The ISO 15 envelope is 62 mm outside diameter and 16 mm width — 1.181 × 2.441 × 0.63 in, with a 16.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "At 30 mm bore the small NU206 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU2 light series at 30 mm bore (62×16 mm) is the default gearbox cylindrical row; on the same bore an NU306 is larger with a much higher rating — do not replace a failed NU306 with an NU206 without re-rating L10 life.", "The 16 mm-wide NU206 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 30 mm bore and 62 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 16.0 mm section.", "For the interference inner ring of NU206, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 30 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 62 mm ring dents the raceways.", "Read the damage on a removed NU206: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 62 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU206; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU206: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 30 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU206 cylindrical roller bearing?", "a": "An NU206 single-row cylindrical roller bearing per ISO 15 has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), a 16.0 mm radial section and roughly 189 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU206 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 06: 06 × 5 = 30 mm. The 62 mm OD and 16 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU206) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU206 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU206E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 30×62×16 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU206E", "NU206-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU207", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 270, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU207 are bore code 07 = 35 mm (code × 5 from 04 upward). The ISO 15 envelope is 72 mm outside diameter and 17 mm width — 1.378 × 2.835 × 0.669 in, with a 18.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "At 35 mm bore the small NU207 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU2 light series at 35 mm bore (72×17 mm) is the default gearbox cylindrical row; on the same bore an NU307 is larger with a much higher rating — do not replace a failed NU307 with an NU207 without re-rating L10 life.", "Before fitting NU207, machine the 35 mm shaft seat and 72 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 18.5 mm radial section.", "With a separable NU207, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU207 with the shaft turning so fresh grease or oil reaches the full 17 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 35 mm bore starved.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU207: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 35 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU207 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU207 cylindrical roller bearing?", "a": "An NU207 single-row cylindrical roller bearing per ISO 15 has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), a 18.5 mm radial section and roughly 270 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU207 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 07: 07 × 5 = 35 mm. The 72 mm OD and 17 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU207) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU207 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU207E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 35×72×17 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU207E", "NU207-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU208", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU208 are bore code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 80 mm outside diameter and 18 mm width — 1.575 × 3.15 × 0.709 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "On this 40 mm-bore NU208, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 40 mm shaft reaches operating temperature.", "The NU2 light series at 40 mm bore (80×18 mm) is the default gearbox cylindrical row; on the same bore an NU308 is larger with a much higher rating — do not replace a failed NU308 with an NU208 without re-rating L10 life.", "Check the shoulder geometry for NU208: a generous fillet on the 40 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 80 mm, 18 mm-wide housing bore.", "Large NU208 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 40 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 18 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU208 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 40 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Choose the ring design for the locating task: a plain NU208 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 18 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 80 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU208 cylindrical roller bearing?", "a": "An NU208 single-row cylindrical roller bearing per ISO 15 has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), a 20.0 mm radial section and roughly 346 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU208 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 08: 08 × 5 = 40 mm. The 80 mm OD and 18 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU208) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU208 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU208E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 40×80×18 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU208E", "NU208-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU209", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 396, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU209 are bore code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 85 mm outside diameter and 19 mm width — 1.772 × 3.346 × 0.748 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "On this 45 mm-bore NU209, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 45 mm shaft reaches operating temperature.", "The NU2 light series at 45 mm bore (85×19 mm) is the default gearbox cylindrical row; on the same bore an NU309 is larger with a much higher rating — do not replace a failed NU309 with an NU209 without re-rating L10 life.", "The 19 mm-wide NU209 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 45 mm bore and 85 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 20.0 mm section.", "For the interference inner ring of NU209, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 45 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 85 mm ring dents the raceways.", "Read the damage on a removed NU209: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 85 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Cylindrical rollers have no self-aligning capacity: line contact across the 19 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 85 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU209 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU209 cylindrical roller bearing?", "a": "An NU209 single-row cylindrical roller bearing per ISO 15 has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), a 20.0 mm radial section and roughly 396 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU209 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 09: 09 × 5 = 45 mm. The 85 mm OD and 19 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU209) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU209 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU209E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 45×85×19 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU209E", "NU209-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU210", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 449, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU210 are bore code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 20 mm width — 1.969 × 3.543 × 0.787 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "On this 50 mm-bore NU210, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 50 mm shaft reaches operating temperature.", "The NU2 light series at 50 mm bore (90×20 mm) is the default gearbox cylindrical row; on the same bore an NU310 is larger with a much higher rating — do not replace a failed NU310 with an NU210 without re-rating L10 life.", "Before fitting NU210, machine the 50 mm shaft seat and 90 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 20.0 mm radial section.", "With a separable NU210, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU210 with the shaft turning so fresh grease or oil reaches the full 20 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 50 mm bore starved.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU210 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU210 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 50×90 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU210 cylindrical roller bearing?", "a": "An NU210 single-row cylindrical roller bearing per ISO 15 has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), a 20.0 mm radial section and roughly 449 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU210 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 10: 10 × 5 = 50 mm. The 90 mm OD and 20 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU210) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU210 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU210E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 50×90×20 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU210E", "NU210-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU211", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 587, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU211 are bore code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 21 mm width — 2.165 × 3.937 × 0.827 in, with a 22.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "On this 55 mm-bore NU211, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 55 mm shaft reaches operating temperature.", "The NU2 light series at 55 mm bore (100×21 mm) is the default gearbox cylindrical row; on the same bore an NU311 is larger with a much higher rating — do not replace a failed NU311 with an NU211 without re-rating L10 life.", "Check the shoulder geometry for NU211: a generous fillet on the 55 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 100 mm, 21 mm-wide housing bore.", "Large NU211 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 55 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 21 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU211 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 55 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The rings of an NU211 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 55×100 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 55 mm inner ring home through the rollers brinells the 100 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU211 cylindrical roller bearing?", "a": "An NU211 single-row cylindrical roller bearing per ISO 15 has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), a 22.5 mm radial section and roughly 587 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU211 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 11: 11 × 5 = 55 mm. The 100 mm OD and 21 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU211) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU211 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU211E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 55×100×21 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU211E", "NU211-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU212", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 749, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU212 are bore code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 22 mm width — 2.362 × 4.331 × 0.866 in, with a 25.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "On this 60 mm-bore NU212, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 60 mm shaft reaches operating temperature.", "The NU2 light series at 60 mm bore (110×22 mm) is the default gearbox cylindrical row; on the same bore an NU312 is larger with a much higher rating — do not replace a failed NU312 with an NU212 without re-rating L10 life.", "The 22 mm-wide NU212 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 60 mm bore and 110 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 25.0 mm section.", "For the interference inner ring of NU212, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 60 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 110 mm ring dents the raceways.", "Read the damage on a removed NU212: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 110 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 60 mm inner ring home through the rollers brinells the 110 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 60 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU212 cylindrical roller bearing?", "a": "An NU212 single-row cylindrical roller bearing per ISO 15 has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), a 25.0 mm radial section and roughly 749 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU212 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 12: 12 × 5 = 60 mm. The 110 mm OD and 22 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU212) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU212 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU212E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 60×110×22 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU212E", "NU212-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU213", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 938, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU213 are bore code 13 = 65 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 23 mm width — 2.559 × 4.724 × 0.906 in, with a 27.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "On this 65 mm-bore NU213, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 65 mm shaft reaches operating temperature.", "The NU2 light series at 65 mm bore (120×23 mm) is the default gearbox cylindrical row; on the same bore an NU313 is larger with a much higher rating — do not replace a failed NU313 with an NU213 without re-rating L10 life.", "Before fitting NU213, machine the 65 mm shaft seat and 120 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 27.5 mm radial section.", "With a separable NU213, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU213 with the shaft turning so fresh grease or oil reaches the full 23 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 65 mm bore starved.", "Order clearance for the fit: a rotating interference inner ring on a 65 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU213; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU213 cylindrical roller bearing?", "a": "An NU213 single-row cylindrical roller bearing per ISO 15 has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), a 27.5 mm radial section and roughly 938 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU213 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 13: 13 × 5 = 65 mm. The 120 mm OD and 23 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU213) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU213 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU213E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 65×120×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU213E", "NU213-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU214", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1032, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU214 are bore code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 125 mm outside diameter and 24 mm width — 2.756 × 4.921 × 0.945 in, with a 27.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "On this 70 mm-bore NU214, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 70 mm shaft reaches operating temperature.", "The NU2 light series at 70 mm bore (125×24 mm) is the default gearbox cylindrical row; on the same bore an NU314 is larger with a much higher rating — do not replace a failed NU314 with an NU214 without re-rating L10 life.", "Check the shoulder geometry for NU214: a generous fillet on the 70 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 125 mm, 24 mm-wide housing bore.", "Large NU214 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 70 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 24 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU214 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 70 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU214; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU214: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 70 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU214 cylindrical roller bearing?", "a": "An NU214 single-row cylindrical roller bearing per ISO 15 has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), a 27.5 mm radial section and roughly 1032 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU214 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 14: 14 × 5 = 70 mm. The 125 mm OD and 24 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU214) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU214 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU214E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 70×125×24 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU214E", "NU214-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU215", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1130, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU215 are bore code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 25 mm width — 2.953 × 5.118 × 0.984 in, with a 27.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "On this 75 mm-bore NU215, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 75 mm shaft reaches operating temperature.", "The NU2 light series at 75 mm bore (130×25 mm) is the default gearbox cylindrical row; on the same bore an NU315 is larger with a much higher rating — do not replace a failed NU315 with an NU215 without re-rating L10 life.", "The 25 mm-wide NU215 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 75 mm bore and 130 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 27.5 mm section.", "For the interference inner ring of NU215, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 75 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 130 mm ring dents the raceways.", "Read the damage on a removed NU215: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 130 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU215: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 75 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU215 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU215 cylindrical roller bearing?", "a": "An NU215 single-row cylindrical roller bearing per ISO 15 has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), a 27.5 mm radial section and roughly 1130 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU215 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 15: 15 × 5 = 75 mm. The 130 mm OD and 25 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU215) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU215 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU215E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 75×130×25 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU215E", "NU215-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU216", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1375, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU216 are bore code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 26 mm width — 3.15 × 5.512 × 1.024 in, with a 30.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "heavy crane and winch drums", "large fan and paper machine rolls", "rolling mill roll necks and chocks", "large gear drives and reducer shafts", "cement and mining machinery drives" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "The large 80 mm-bore NU216 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 140 mm outer ring squarely, and plan lifting fixtures for the 26 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU2 light series at 80 mm bore (140×26 mm) is the default gearbox cylindrical row; on the same bore an NU316 is larger with a much higher rating — do not replace a failed NU316 with an NU216 without re-rating L10 life.", "Before fitting NU216, machine the 80 mm shaft seat and 140 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 30.0 mm radial section.", "With a separable NU216, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU216 with the shaft turning so fresh grease or oil reaches the full 26 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 80 mm bore starved.", "Choose the ring design for the locating task: a plain NU216 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 26 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 140 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU216 cylindrical roller bearing?", "a": "An NU216 single-row cylindrical roller bearing per ISO 15 has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), a 30.0 mm radial section and roughly 1375 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU216 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 16: 16 × 5 = 80 mm. The 140 mm OD and 26 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU216) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU216 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU216E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 80×140×26 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU216E", "NU216-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU217", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1714, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU217 are bore code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 28 mm width — 3.346 × 5.906 × 1.102 in, with a 32.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "large fan and paper machine rolls", "rolling mill roll necks and chocks", "large gear drives and reducer shafts", "cement and mining machinery drives", "crusher eccentric and drum shafts" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "The large 85 mm-bore NU217 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 150 mm outer ring squarely, and plan lifting fixtures for the 28 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU2 light series at 85 mm bore (150×28 mm) is the default gearbox cylindrical row; on the same bore an NU317 is larger with a much higher rating — do not replace a failed NU317 with an NU217 without re-rating L10 life.", "Check the shoulder geometry for NU217: a generous fillet on the 85 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 150 mm, 28 mm-wide housing bore.", "Large NU217 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 85 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 28 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU217 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 85 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Cylindrical rollers have no self-aligning capacity: line contact across the 28 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 150 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU217 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU217 cylindrical roller bearing?", "a": "An NU217 single-row cylindrical roller bearing per ISO 15 has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), a 32.5 mm radial section and roughly 1714 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU217 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 17: 17 × 5 = 85 mm. The 150 mm OD and 28 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU217) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU217 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU217E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 85×150×28 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU217E", "NU217-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU218", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2104, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU218 are bore code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 160 mm outside diameter and 30 mm width — 3.543 × 6.299 × 1.181 in, with a 35.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "rolling mill roll necks and chocks", "large gear drives and reducer shafts", "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "The large 90 mm-bore NU218 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 160 mm outer ring squarely, and plan lifting fixtures for the 30 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU2 light series at 90 mm bore (160×30 mm) is the default gearbox cylindrical row; on the same bore an NU318 is larger with a much higher rating — do not replace a failed NU318 with an NU218 without re-rating L10 life.", "The 30 mm-wide NU218 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 90 mm bore and 160 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 35.0 mm section.", "For the interference inner ring of NU218, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 90 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 160 mm ring dents the raceways.", "Read the damage on a removed NU218: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 160 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU218 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU218 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 90×160 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU218 cylindrical roller bearing?", "a": "An NU218 single-row cylindrical roller bearing per ISO 15 has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), a 35.0 mm radial section and roughly 2104 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU218 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 18: 18 × 5 = 90 mm. The 160 mm OD and 30 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU218) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU218 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU218E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 90×160×30 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU218E", "NU218-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU219", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2549, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU219 are bore code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 32 mm width — 3.74 × 6.693 × 1.26 in, with a 37.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "large gear drives and reducer shafts", "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums", "large fan and paper machine rolls" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "The large 95 mm-bore NU219 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 170 mm outer ring squarely, and plan lifting fixtures for the 32 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU2 light series at 95 mm bore (170×32 mm) is the default gearbox cylindrical row; on the same bore an NU319 is larger with a much higher rating — do not replace a failed NU319 with an NU219 without re-rating L10 life.", "Before fitting NU219, machine the 95 mm shaft seat and 170 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 37.5 mm radial section.", "With a separable NU219, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU219 with the shaft turning so fresh grease or oil reaches the full 32 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 95 mm bore starved.", "The rings of an NU219 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 95×170 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 95 mm inner ring home through the rollers brinells the 170 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU219 cylindrical roller bearing?", "a": "An NU219 single-row cylindrical roller bearing per ISO 15 has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), a 37.5 mm radial section and roughly 2549 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU219 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 19: 19 × 5 = 95 mm. The 170 mm OD and 32 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU219) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU219 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU219E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 95×170×32 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU219E", "NU219-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU220", "brand": "GENERIC-ISO", "series": "NU200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3052, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU220 are bore code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 34 mm width — 3.937 × 7.087 × 1.339 in, with a 40.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums", "large fan and paper machine rolls", "rolling mill roll necks and chocks" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "The large 100 mm-bore NU220 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 180 mm outer ring squarely, and plan lifting fixtures for the 34 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU2 light series at 100 mm bore (180×34 mm) is the default gearbox cylindrical row; on the same bore an NU320 is larger with a much higher rating — do not replace a failed NU320 with an NU220 without re-rating L10 life.", "Check the shoulder geometry for NU220: a generous fillet on the 100 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 180 mm, 34 mm-wide housing bore.", "Large NU220 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 100 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 34 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU220 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 100 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 100 mm inner ring home through the rollers brinells the 180 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 100 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU220 cylindrical roller bearing?", "a": "An NU220 single-row cylindrical roller bearing per ISO 15 has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), a 40.0 mm radial section and roughly 3052 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU220 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 20: 20 × 5 = 100 mm. The 180 mm OD and 34 mm width come from the ISO 15 dimension series (NU200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU220) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU220 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU220E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 100×180×34 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU220E", "NU220-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU304", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 138, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU304 are bore code 04 = 20 mm (code × 5 from 04 upward). The ISO 15 envelope is 52 mm outside diameter and 15 mm width — 0.787 × 2.047 × 0.591 in, with a 16.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "At 20 mm bore the small NU304 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU3 medium series at 20 mm bore uses the 52 mm OD and 15 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU204, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU304, machine the 20 mm shaft seat and 52 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 16.0 mm radial section.", "With a separable NU304, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU304 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 20 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Order clearance for the fit: a rotating interference inner ring on a 20 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU304; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU304 cylindrical roller bearing?", "a": "An NU304 single-row cylindrical roller bearing per ISO 15 has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), a 16.0 mm radial section and roughly 138 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU304 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 04: 04 × 5 = 20 mm. The 52 mm OD and 15 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU304) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU304 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU304E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 20×52×15 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU304E", "NU304-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU305", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 219, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU305 are bore code 05 = 25 mm (code × 5 from 04 upward). The ISO 15 envelope is 62 mm outside diameter and 17 mm width — 0.984 × 2.441 × 0.669 in, with a 18.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "At 25 mm bore the small NU305 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU3 medium series at 25 mm bore uses the 62 mm OD and 17 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU205, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU305: a generous fillet on the 25 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 62 mm, 17 mm-wide housing bore.", "Large NU305 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 25 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 17 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU305: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 62 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU305; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU305: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 25 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU305 cylindrical roller bearing?", "a": "An NU305 single-row cylindrical roller bearing per ISO 15 has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), a 18.5 mm radial section and roughly 219 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU305 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 05: 05 × 5 = 25 mm. The 62 mm OD and 17 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU305) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU305 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU305E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 25×62×17 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU305E", "NU305-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU306", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 326, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU306 are bore code 06 = 30 mm (code × 5 from 04 upward). The ISO 15 envelope is 72 mm outside diameter and 19 mm width — 1.181 × 2.835 × 0.748 in, with a 21.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts", "small gearbox layshafts and pinion shafts" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "At 30 mm bore the small NU306 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU3 medium series at 30 mm bore uses the 72 mm OD and 19 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU206, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "The 19 mm-wide NU306 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 30 mm bore and 72 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 21.0 mm section.", "For the interference inner ring of NU306, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 30 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 72 mm ring dents the raceways.", "Relubricate NU306 with the shaft turning so fresh grease or oil reaches the full 19 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 30 mm bore starved.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU306: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 30 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU306 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU306 cylindrical roller bearing?", "a": "An NU306 single-row cylindrical roller bearing per ISO 15 has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), a 21.0 mm radial section and roughly 326 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU306 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 06: 06 × 5 = 30 mm. The 72 mm OD and 19 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU306) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU306 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU306E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 30×72×19 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU306E", "NU306-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU307", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 436, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU307 are bore code 07 = 35 mm (code × 5 from 04 upward). The ISO 15 envelope is 80 mm outside diameter and 21 mm width — 1.378 × 3.15 × 0.827 in, with a 22.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "At 35 mm bore the small NU307 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU3 medium series at 35 mm bore uses the 80 mm OD and 21 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU207, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU307, machine the 35 mm shaft seat and 80 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 22.5 mm radial section.", "With a separable NU307, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU307 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 35 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Choose the ring design for the locating task: a plain NU307 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 21 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 80 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU307 cylindrical roller bearing?", "a": "An NU307 single-row cylindrical roller bearing per ISO 15 has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), a 22.5 mm radial section and roughly 436 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU307 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 07: 07 × 5 = 35 mm. The 80 mm OD and 21 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU307) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU307 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU307E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 35×80×21 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU307E", "NU307-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU308", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 599, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU308 are bore code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 23 mm width — 1.575 × 3.543 × 0.906 in, with a 25.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "On this 40 mm-bore NU308, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 40 mm shaft reaches operating temperature.", "The NU3 medium series at 40 mm bore uses the 90 mm OD and 23 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU208, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU308: a generous fillet on the 40 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 90 mm, 23 mm-wide housing bore.", "Large NU308 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 40 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 23 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU308: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 90 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Cylindrical rollers have no self-aligning capacity: line contact across the 23 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 90 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU308 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU308 cylindrical roller bearing?", "a": "An NU308 single-row cylindrical roller bearing per ISO 15 has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), a 25.0 mm radial section and roughly 599 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU308 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 08: 08 × 5 = 40 mm. The 90 mm OD and 23 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU308) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU308 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU308E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 40×90×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU308E", "NU308-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU309", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 799, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU309 are bore code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 25 mm width — 1.772 × 3.937 × 0.984 in, with a 27.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "On this 45 mm-bore NU309, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 45 mm shaft reaches operating temperature.", "The NU3 medium series at 45 mm bore uses the 100 mm OD and 25 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU209, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "The 25 mm-wide NU309 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 45 mm bore and 100 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 27.5 mm section.", "For the interference inner ring of NU309, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 45 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 100 mm ring dents the raceways.", "Relubricate NU309 with the shaft turning so fresh grease or oil reaches the full 25 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 45 mm bore starved.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU309 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU309 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 45×100 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU309 cylindrical roller bearing?", "a": "An NU309 single-row cylindrical roller bearing per ISO 15 has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), a 27.5 mm radial section and roughly 799 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU309 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 09: 09 × 5 = 45 mm. The 100 mm OD and 25 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU309) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU309 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU309E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 45×100×25 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU309E", "NU309-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU310", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1039, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU310 are bore code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 27 mm width — 1.969 × 4.331 × 1.063 in, with a 30.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "On this 50 mm-bore NU310, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 50 mm shaft reaches operating temperature.", "The NU3 medium series at 50 mm bore uses the 110 mm OD and 27 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU210, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU310, machine the 50 mm shaft seat and 110 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 30.0 mm radial section.", "With a separable NU310, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU310 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 50 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The rings of an NU310 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 50×110 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 50 mm inner ring home through the rollers brinells the 110 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU310 cylindrical roller bearing?", "a": "An NU310 single-row cylindrical roller bearing per ISO 15 has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), a 30.0 mm radial section and roughly 1039 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU310 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 10: 10 × 5 = 50 mm. The 110 mm OD and 27 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU310) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU310 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU310E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 50×110×27 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU310E", "NU310-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU311", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1322, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU311 are bore code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 29 mm width — 2.165 × 4.724 × 1.142 in, with a 32.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "On this 55 mm-bore NU311, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 55 mm shaft reaches operating temperature.", "The NU3 medium series at 55 mm bore uses the 120 mm OD and 29 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU211, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU311: a generous fillet on the 55 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 120 mm, 29 mm-wide housing bore.", "Large NU311 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 55 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 29 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU311: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 120 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 55 mm inner ring home through the rollers brinells the 120 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 55 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU311 cylindrical roller bearing?", "a": "An NU311 single-row cylindrical roller bearing per ISO 15 has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), a 32.5 mm radial section and roughly 1322 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU311 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 11: 11 × 5 = 55 mm. The 120 mm OD and 29 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU311) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU311 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU311E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 55×120×29 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU311E", "NU311-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU312", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1652, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU312 are bore code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 31 mm width — 2.362 × 5.118 × 1.22 in, with a 35.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "On this 60 mm-bore NU312, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 60 mm shaft reaches operating temperature.", "The NU3 medium series at 60 mm bore uses the 130 mm OD and 31 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU212, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "The 31 mm-wide NU312 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 60 mm bore and 130 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 35.0 mm section.", "For the interference inner ring of NU312, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 60 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 130 mm ring dents the raceways.", "Relubricate NU312 with the shaft turning so fresh grease or oil reaches the full 31 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 60 mm bore starved.", "Order clearance for the fit: a rotating interference inner ring on a 60 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU312; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU312 cylindrical roller bearing?", "a": "An NU312 single-row cylindrical roller bearing per ISO 15 has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), a 35.0 mm radial section and roughly 1652 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU312 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 12: 12 × 5 = 60 mm. The 130 mm OD and 31 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU312) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU312 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU312E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 60×130×31 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU312E", "NU312-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU313", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2033, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU313 are bore code 13 = 65 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 33 mm width — 2.559 × 5.512 × 1.299 in, with a 37.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "On this 65 mm-bore NU313, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 65 mm shaft reaches operating temperature.", "The NU3 medium series at 65 mm bore uses the 140 mm OD and 33 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU213, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU313, machine the 65 mm shaft seat and 140 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 37.5 mm radial section.", "With a separable NU313, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU313 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 65 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU313; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU313: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 65 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU313 cylindrical roller bearing?", "a": "An NU313 single-row cylindrical roller bearing per ISO 15 has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), a 37.5 mm radial section and roughly 2033 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU313 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 13: 13 × 5 = 65 mm. The 140 mm OD and 33 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU313) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU313 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU313E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 65×140×33 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU313E", "NU313-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU314", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2469, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU314 are bore code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 35 mm width — 2.756 × 5.906 × 1.378 in, with a 40.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "On this 70 mm-bore NU314, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 70 mm shaft reaches operating temperature.", "The NU3 medium series at 70 mm bore uses the 150 mm OD and 35 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU214, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU314: a generous fillet on the 70 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 150 mm, 35 mm-wide housing bore.", "Large NU314 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 70 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 35 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU314: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 150 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU314: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 70 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU314 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU314 cylindrical roller bearing?", "a": "An NU314 single-row cylindrical roller bearing per ISO 15 has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), a 40.0 mm radial section and roughly 2469 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU314 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 14: 14 × 5 = 70 mm. The 150 mm OD and 35 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU314) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU314 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU314E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 70×150×35 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU314E", "NU314-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU315", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2962, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU315 are bore code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 160 mm outside diameter and 37 mm width — 2.953 × 6.299 × 1.457 in, with a 42.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "On this 75 mm-bore NU315, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 75 mm shaft reaches operating temperature.", "The NU3 medium series at 75 mm bore uses the 160 mm OD and 37 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU215, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "The 37 mm-wide NU315 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 75 mm bore and 160 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 42.5 mm section.", "For the interference inner ring of NU315, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 75 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 160 mm ring dents the raceways.", "Relubricate NU315 with the shaft turning so fresh grease or oil reaches the full 37 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 75 mm bore starved.", "Choose the ring design for the locating task: a plain NU315 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 37 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 160 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU315 cylindrical roller bearing?", "a": "An NU315 single-row cylindrical roller bearing per ISO 15 has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), a 42.5 mm radial section and roughly 2962 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU315 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 15: 15 × 5 = 75 mm. The 160 mm OD and 37 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU315) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU315 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU315E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 75×160×37 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU315E", "NU315-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU316", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3517, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU316 are bore code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 39 mm width — 3.15 × 6.693 × 1.535 in, with a 45.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "rolling mill roll necks and chocks", "large gear drives and reducer shafts", "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "The large 80 mm-bore NU316 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 170 mm outer ring squarely, and plan lifting fixtures for the 39 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU3 medium series at 80 mm bore uses the 170 mm OD and 39 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU216, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU316, machine the 80 mm shaft seat and 170 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 45.0 mm radial section.", "With a separable NU316, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU316 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 80 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Cylindrical rollers have no self-aligning capacity: line contact across the 39 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 170 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU316 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU316 cylindrical roller bearing?", "a": "An NU316 single-row cylindrical roller bearing per ISO 15 has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), a 45.0 mm radial section and roughly 3517 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU316 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 16: 16 × 5 = 80 mm. The 170 mm OD and 39 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU316) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU316 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU316E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 80×170×39 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU316E", "NU316-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU317", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU317 are bore code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 41 mm width — 3.346 × 7.087 × 1.614 in, with a 47.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "large gear drives and reducer shafts", "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums", "large fan and paper machine rolls" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "The large 85 mm-bore NU317 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 180 mm outer ring squarely, and plan lifting fixtures for the 41 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU3 medium series at 85 mm bore uses the 180 mm OD and 41 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU217, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU317: a generous fillet on the 85 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 180 mm, 41 mm-wide housing bore.", "Large NU317 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 85 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 41 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU317: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 180 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU317 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU317 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 85×180 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU317 cylindrical roller bearing?", "a": "An NU317 single-row cylindrical roller bearing per ISO 15 has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), a 47.5 mm radial section and roughly 4136 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU317 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 17: 17 × 5 = 85 mm. The 180 mm OD and 41 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU317) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU317 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU317E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 85×180×41 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU317E", "NU317-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU318", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4825, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU318 are bore code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 190 mm outside diameter and 43 mm width — 3.543 × 7.48 × 1.693 in, with a 50.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "cement and mining machinery drives", "crusher eccentric and drum shafts", "heavy crane and winch drums", "large fan and paper machine rolls", "rolling mill roll necks and chocks" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "The large 90 mm-bore NU318 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 190 mm outer ring squarely, and plan lifting fixtures for the 43 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU3 medium series at 90 mm bore uses the 190 mm OD and 43 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU218, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "The 43 mm-wide NU318 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 90 mm bore and 190 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 50.0 mm section.", "For the interference inner ring of NU318, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 90 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 190 mm ring dents the raceways.", "Relubricate NU318 with the shaft turning so fresh grease or oil reaches the full 43 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 90 mm bore starved.", "The rings of an NU318 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 90×190 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 90 mm inner ring home through the rollers brinells the 190 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU318 cylindrical roller bearing?", "a": "An NU318 single-row cylindrical roller bearing per ISO 15 has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), a 50.0 mm radial section and roughly 4825 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU318 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 18: 18 × 5 = 90 mm. The 190 mm OD and 43 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU318) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU318 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU318E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 90×190×43 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU318E", "NU318-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU319", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5586, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU319 are bore code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 200 mm outside diameter and 45 mm width — 3.74 × 7.874 × 1.772 in, with a 52.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "crusher eccentric and drum shafts", "heavy crane and winch drums", "large fan and paper machine rolls", "rolling mill roll necks and chocks", "large gear drives and reducer shafts" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "The large 95 mm-bore NU319 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 200 mm outer ring squarely, and plan lifting fixtures for the 45 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU3 medium series at 95 mm bore uses the 200 mm OD and 45 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU219, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Before fitting NU319, machine the 95 mm shaft seat and 200 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 52.5 mm radial section.", "With a separable NU319, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "When reusing separable NU319 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 95 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 95 mm inner ring home through the rollers brinells the 200 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 95 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU319 cylindrical roller bearing?", "a": "An NU319 single-row cylindrical roller bearing per ISO 15 has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), a 52.5 mm radial section and roughly 5586 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU319 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 19: 19 × 5 = 95 mm. The 200 mm OD and 45 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU319) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU319 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU319E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 95×200×45 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU319E", "NU319-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU320", "brand": "GENERIC-ISO", "series": "NU300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6823, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU320 are bore code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 215 mm outside diameter and 47 mm width — 3.937 × 8.465 × 1.85 in, with a 57.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "heavy crane and winch drums", "large fan and paper machine rolls", "rolling mill roll necks and chocks", "large gear drives and reducer shafts", "cement and mining machinery drives" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "The large 100 mm-bore NU320 mounts with substantial force: heat the inner ring or use hydraulic equipment, support the 215 mm outer ring squarely, and plan lifting fixtures for the 47 mm-wide roller assembly — drifting it in cold brinells the line-contact raceways.", "The NU3 medium series at 100 mm bore uses the 215 mm OD and 47 mm width for heavy radial load; it needs stiffer shaft and housing shoulders and runs lower limiting speed than an NU220, so it is a poor choice in a high-rpm gearbox stage sized for the light row.", "Check the shoulder geometry for NU320: a generous fillet on the 100 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 215 mm, 47 mm-wide housing bore.", "Large NU320 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 100 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 47 mm-wide set locks the rollers at the first hot run.", "Read the damage on a removed NU320: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 215 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Order clearance for the fit: a rotating interference inner ring on a 100 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU320; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU320 cylindrical roller bearing?", "a": "An NU320 single-row cylindrical roller bearing per ISO 15 has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), a 57.5 mm radial section and roughly 6823 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU320 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 20: 20 × 5 = 100 mm. The 215 mm OD and 47 mm width come from the ISO 15 dimension series (NU300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU320) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU320 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU320E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 100×215×47 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU320E", "NU320-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2205", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 150, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2205 are bore code 05 = 25 mm (code × 5 from 04 upward). The ISO 15 envelope is 52 mm outside diameter and 18 mm width — 0.984 × 2.047 × 0.709 in, with a 13.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "At 25 mm bore the small NU2205 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU22 wide series keeps the NU2 OD at 25 mm bore (52 mm) but widens to 18 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU205 gap leaves the wide ring loose axially.", "Check the shoulder geometry for NU2205: a generous fillet on the 25 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 52 mm, 18 mm-wide housing bore.", "Large NU2205 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 25 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 18 mm-wide set locks the rollers at the first hot run.", "Relubricate NU2205 with the shaft turning so fresh grease or oil reaches the full 18 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 25 mm bore starved.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU2205: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 25 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU2205 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU2205 cylindrical roller bearing?", "a": "An NU2205 single-row cylindrical roller bearing per ISO 15 has a 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in), a 13.5 mm radial section and roughly 150 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2205 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 05: 05 × 5 = 25 mm. The 52 mm OD and 18 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2205) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2205 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2205E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 25×52×18 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2205E", "NU2205-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2206", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 236, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2206 are bore code 06 = 30 mm (code × 5 from 04 upward). The ISO 15 envelope is 62 mm outside diameter and 20 mm width — 1.181 × 2.441 × 0.787 in, with a 16.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "textile and packaging machinery rolls", "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "At 30 mm bore the small NU2206 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU22 wide series keeps the NU2 OD at 30 mm bore (62 mm) but widens to 20 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU206 gap leaves the wide ring loose axially.", "The 20 mm-wide NU2206 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 30 mm bore and 62 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 16.0 mm section.", "For the interference inner ring of NU2206, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 30 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 62 mm ring dents the raceways.", "When reusing separable NU2206 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 30 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Choose the ring design for the locating task: a plain NU2206 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 20 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 62 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU2206 cylindrical roller bearing?", "a": "An NU2206 single-row cylindrical roller bearing per ISO 15 has a 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in), a 16.0 mm radial section and roughly 236 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2206 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 06: 06 × 5 = 30 mm. The 62 mm OD and 20 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2206) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2206 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2206E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 30×62×20 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2206E", "NU2206-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2207", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 365, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2207 are bore code 07 = 35 mm (code × 5 from 04 upward). The ISO 15 envelope is 72 mm outside diameter and 23 mm width — 1.378 × 2.835 × 0.906 in, with a 18.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "At 35 mm bore the small NU2207 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU22 wide series keeps the NU2 OD at 35 mm bore (72 mm) but widens to 23 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU207 gap leaves the wide ring loose axially.", "Before fitting NU2207, machine the 35 mm shaft seat and 72 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 18.5 mm radial section.", "With a separable NU2207, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Read the damage on a removed NU2207: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 72 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Cylindrical rollers have no self-aligning capacity: line contact across the 23 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 72 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU2207 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU2207 cylindrical roller bearing?", "a": "An NU2207 single-row cylindrical roller bearing per ISO 15 has a 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in), a 18.5 mm radial section and roughly 365 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2207 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 07: 07 × 5 = 35 mm. The 72 mm OD and 23 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2207) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2207 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2207E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 35×72×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2207E", "NU2207-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2208", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 442, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2208 are bore code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 80 mm outside diameter and 23 mm width — 1.575 × 3.15 × 0.906 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "On this 40 mm-bore NU2208, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 40 mm shaft reaches operating temperature.", "The NU22 wide series keeps the NU2 OD at 40 mm bore (80 mm) but widens to 23 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU208 gap leaves the wide ring loose axially.", "Check the shoulder geometry for NU2208: a generous fillet on the 40 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 80 mm, 23 mm-wide housing bore.", "Large NU2208 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 40 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 23 mm-wide set locks the rollers at the first hot run.", "Relubricate NU2208 with the shaft turning so fresh grease or oil reaches the full 23 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 40 mm bore starved.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU2208 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU2208 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 40×80 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU2208 cylindrical roller bearing?", "a": "An NU2208 single-row cylindrical roller bearing per ISO 15 has a 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in), a 20.0 mm radial section and roughly 442 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2208 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 08: 08 × 5 = 40 mm. The 80 mm OD and 23 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2208) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2208 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2208E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 40×80×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2208E", "NU2208-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2209", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 479, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2209 are bore code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 85 mm outside diameter and 23 mm width — 1.772 × 3.346 × 0.906 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "On this 45 mm-bore NU2209, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 45 mm shaft reaches operating temperature.", "The NU22 wide series keeps the NU2 OD at 45 mm bore (85 mm) but widens to 23 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU209 gap leaves the wide ring loose axially.", "The 23 mm-wide NU2209 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 45 mm bore and 85 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 20.0 mm section.", "For the interference inner ring of NU2209, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 45 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 85 mm ring dents the raceways.", "When reusing separable NU2209 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 45 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The rings of an NU2209 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 45×85 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 45 mm inner ring home through the rollers brinells the 85 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU2209 cylindrical roller bearing?", "a": "An NU2209 single-row cylindrical roller bearing per ISO 15 has a 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in), a 20.0 mm radial section and roughly 479 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2209 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 09: 09 × 5 = 45 mm. The 85 mm OD and 23 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2209) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2209 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2209E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 45×85×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2209E", "NU2209-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2210", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 516, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2210 are bore code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 23 mm width — 1.969 × 3.543 × 0.906 in, with a 20.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "On this 50 mm-bore NU2210, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 50 mm shaft reaches operating temperature.", "The NU22 wide series keeps the NU2 OD at 50 mm bore (90 mm) but widens to 23 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU210 gap leaves the wide ring loose axially.", "Before fitting NU2210, machine the 50 mm shaft seat and 90 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 20.0 mm radial section.", "With a separable NU2210, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Read the damage on a removed NU2210: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 90 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 50 mm inner ring home through the rollers brinells the 90 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 50 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU2210 cylindrical roller bearing?", "a": "An NU2210 single-row cylindrical roller bearing per ISO 15 has a 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in), a 20.0 mm radial section and roughly 516 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2210 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 10: 10 × 5 = 50 mm. The 90 mm OD and 23 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2210) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2210 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2210E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 50×90×23 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2210E", "NU2210-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2211", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 699, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2211 are bore code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 25 mm width — 2.165 × 3.937 × 0.984 in, with a 22.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "On this 55 mm-bore NU2211, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 55 mm shaft reaches operating temperature.", "The NU22 wide series keeps the NU2 OD at 55 mm bore (100 mm) but widens to 25 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU211 gap leaves the wide ring loose axially.", "Check the shoulder geometry for NU2211: a generous fillet on the 55 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 100 mm, 25 mm-wide housing bore.", "Large NU2211 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 55 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 25 mm-wide set locks the rollers at the first hot run.", "Relubricate NU2211 with the shaft turning so fresh grease or oil reaches the full 25 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 55 mm bore starved.", "Order clearance for the fit: a rotating interference inner ring on a 55 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU2211; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU2211 cylindrical roller bearing?", "a": "An NU2211 single-row cylindrical roller bearing per ISO 15 has a 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in), a 22.5 mm radial section and roughly 699 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2211 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 11: 11 × 5 = 55 mm. The 100 mm OD and 25 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2211) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2211 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2211E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 55×100×25 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2211E", "NU2211-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2212", "brand": "GENERIC-ISO", "series": "NU2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 954, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2200-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2212 are bore code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 28 mm width — 2.362 × 4.331 × 1.102 in, with a 25.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "On this 60 mm-bore NU2212, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 60 mm shaft reaches operating temperature.", "The NU22 wide series keeps the NU2 OD at 60 mm bore (110 mm) but widens to 28 mm, raising the rating inside the same housing bore; the extra width is not free — verify the shaft shoulder spacing, since an NU212 gap leaves the wide ring loose axially.", "The 28 mm-wide NU2212 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 60 mm bore and 110 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 25.0 mm section.", "For the interference inner ring of NU2212, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 60 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 110 mm ring dents the raceways.", "When reusing separable NU2212 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 60 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU2212; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU2212: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 60 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU2212 cylindrical roller bearing?", "a": "An NU2212 single-row cylindrical roller bearing per ISO 15 has a 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in), a 25.0 mm radial section and roughly 954 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2212 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 12: 12 × 5 = 60 mm. The 110 mm OD and 28 mm width come from the ISO 15 dimension series (NU2200), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2212) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2212 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2212E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 60×110×28 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2212E", "NU2212-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2305", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 310, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2305 are bore code 05 = 25 mm (code × 5 from 04 upward). The ISO 15 envelope is 62 mm outside diameter and 24 mm width — 0.984 × 2.441 × 0.945 in, with a 18.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "light conveyor drive shafts", "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts" ], "failure_modes": [ "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders" ], "pitfalls": [ "At 25 mm bore the small NU2305 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU23 wide medium series (25×62×24 mm) packs the highest rating of the 25 mm-bore cylindrical rows into the NU3 housing bore; the 18.5 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU305.", "Check the shoulder geometry for NU2305: a generous fillet on the 25 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 62 mm, 24 mm-wide housing bore.", "Large NU2305 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 25 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 24 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU2305 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 25 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "Choose the ring design for the locating task: a plain NU2305 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location.", "Cylindrical rollers have no self-aligning capacity: line contact across the 24 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 62 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead." ], "faq": [ { "q": "What are the dimensions of an NU2305 cylindrical roller bearing?", "a": "An NU2305 single-row cylindrical roller bearing per ISO 15 has a 25 mm bore, 62 mm outer diameter and 24 mm width (0.984 × 2.441 × 0.945 in), a 18.5 mm radial section and roughly 310 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2305 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 05: 05 × 5 = 25 mm. The 62 mm OD and 24 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2305) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2305 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2305E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 25×62×24 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2305E", "NU2305-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2306", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 464, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2306 are bore code 06 = 30 mm (code × 5 from 04 upward). The ISO 15 envelope is 72 mm outside diameter and 27 mm width — 1.181 × 2.835 × 1.063 in, with a 21.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "small gearbox layshafts and pinion shafts", "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls" ], "failure_modes": [ "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication" ], "pitfalls": [ "At 30 mm bore the small NU2306 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU23 wide medium series (30×72×27 mm) packs the highest rating of the 30 mm-bore cylindrical rows into the NU3 housing bore; the 21.0 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU306.", "The 27 mm-wide NU2306 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 30 mm bore and 72 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 21.0 mm section.", "For the interference inner ring of NU2306, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 30 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 72 mm ring dents the raceways.", "Read the damage on a removed NU2306: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 72 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Cylindrical rollers have no self-aligning capacity: line contact across the 27 mm-wide rollers means even a few tenths of a degree of misalignment edge-loads the 72 mm raceway; where shaft deflection is unavoidable, use a spherical roller or a self-aligning ball bearing instead.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU2306 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty." ], "faq": [ { "q": "What are the dimensions of an NU2306 cylindrical roller bearing?", "a": "An NU2306 single-row cylindrical roller bearing per ISO 15 has a 30 mm bore, 72 mm outer diameter and 27 mm width (1.181 × 2.835 × 1.063 in), a 21.0 mm radial section and roughly 464 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2306 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 06: 06 × 5 = 30 mm. The 72 mm OD and 27 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2306) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2306 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2306E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 30×72×27 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2306E", "NU2306-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2307", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 643, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2307 are bore code 07 = 35 mm (code × 5 from 04 upward). The ISO 15 envelope is 80 mm outside diameter and 31 mm width — 1.378 × 3.15 × 1.22 in, with a 22.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "fractional electric motor armatures", "two-wheeler and appliance transmissions", "small pump and fan rotor shafts", "textile and packaging machinery rolls", "light conveyor drive shafts" ], "failure_modes": [ "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit" ], "pitfalls": [ "At 35 mm bore the small NU2307 commonly shares a gearbox bore with a 6-series deep-groove row; do not substitute by envelope alone — the cylindrical roller carries far more radial load but no thrust, so any helical-gear axial force needs a paired angular-contact or NJ locating row.", "The NU23 wide medium series (35×80×31 mm) packs the highest rating of the 35 mm-bore cylindrical rows into the NU3 housing bore; the 22.5 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU307.", "Before fitting NU2307, machine the 35 mm shaft seat and 80 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 22.5 mm radial section.", "With a separable NU2307, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU2307 with the shaft turning so fresh grease or oil reaches the full 31 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 35 mm bore starved.", "Keep the minimum load above the skid threshold (catalogue rule of thumb roughly 1–2% of the dynamic rating); an unloaded NU2307 on an idler or in a cold-start gearbox develops roller smearing, so add a spring preload or downsize the bearing if the duty is mostly empty.", "The rings of an NU2307 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 35×80 dimensions." ], "faq": [ { "q": "What are the dimensions of an NU2307 cylindrical roller bearing?", "a": "An NU2307 single-row cylindrical roller bearing per ISO 15 has a 35 mm bore, 80 mm outer diameter and 31 mm width (1.378 × 3.15 × 1.22 in), a 22.5 mm radial section and roughly 643 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2307 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 07: 07 × 5 = 35 mm. The 80 mm OD and 31 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2307) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2307 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2307E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 35×80×31 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2307E", "NU2307-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2308", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 860, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2308 are bore code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 33 mm width — 1.575 × 3.543 × 1.299 in, with a 25.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes" ], "failure_modes": [ "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align", "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration" ], "pitfalls": [ "On this 40 mm-bore NU2308, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 40 mm shaft reaches operating temperature.", "The NU23 wide medium series (40×90×33 mm) packs the highest rating of the 40 mm-bore cylindrical rows into the NU3 housing bore; the 25.0 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU308.", "Check the shoulder geometry for NU2308: a generous fillet on the 40 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 90 mm, 33 mm-wide housing bore.", "Large NU2308 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 40 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 33 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU2308 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 40 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The rings of an NU2308 are separable and supplied as a matched unit: never mix the outer ring of one bearing with the inner-ring/roller assembly of another — the raceway and roller complement are graded together, and cross-matching shortens life even at identical 40×90 dimensions.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 40 mm inner ring home through the rollers brinells the 90 mm outer raceway." ], "faq": [ { "q": "What are the dimensions of an NU2308 cylindrical roller bearing?", "a": "An NU2308 single-row cylindrical roller bearing per ISO 15 has a 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in), a 25.0 mm radial section and roughly 860 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2308 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 08: 08 × 5 = 40 mm. The 90 mm OD and 33 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2308) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2308 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2308E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 40×90×33 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2308E", "NU2308-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2309", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1151, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2309 are bore code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 36 mm width — 1.772 × 3.937 × 1.417 in, with a 27.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives" ], "failure_modes": [ "roller-end and flange scoring when an NU bearing is forced to locate axially; only NJ/NUP designs carry thrust at the shoulders", "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set" ], "pitfalls": [ "On this 45 mm-bore NU2309, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 45 mm shaft reaches operating temperature.", "The NU23 wide medium series (45×100×36 mm) packs the highest rating of the 45 mm-bore cylindrical rows into the NU3 housing bore; the 27.5 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU309.", "The 36 mm-wide NU2309 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 45 mm bore and 100 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 27.5 mm section.", "For the interference inner ring of NU2309, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 45 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 100 mm ring dents the raceways.", "Read the damage on a removed NU2309: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 100 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "Apply mounting force to the ring with the interference fit — inner ring for a shaft fit, outer ring for a housing fit; pushing the 45 mm inner ring home through the rollers brinells the 100 mm outer raceway.", "Order clearance for the fit: a rotating interference inner ring on a 45 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings." ], "faq": [ { "q": "What are the dimensions of an NU2309 cylindrical roller bearing?", "a": "An NU2309 single-row cylindrical roller bearing per ISO 15 has a 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in), a 27.5 mm radial section and roughly 1151 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2309 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 09: 09 × 5 = 45 mm. The 100 mm OD and 36 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2309) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2309 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2309E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 45×100×36 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2309E", "NU2309-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2310", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1539, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2310 are bore code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 40 mm width — 1.969 × 4.331 × 1.575 in, with a 30.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "conveyor and hoist gearcase shafts", "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts" ], "failure_modes": [ "cage fatigue and fracture after sustained over-speed with marginal lubrication", "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance" ], "pitfalls": [ "On this 50 mm-bore NU2310, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 50 mm shaft reaches operating temperature.", "The NU23 wide medium series (50×110×40 mm) packs the highest rating of the 50 mm-bore cylindrical rows into the NU3 housing bore; the 30.0 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU310.", "Before fitting NU2310, machine the 50 mm shaft seat and 110 mm housing bore with a relief or undercut so nothing bridges the chamfer; the separable rings only carry load when their full faces abut, and a large fillet pinches the 30.0 mm radial section.", "With a separable NU2310, mount the inner-ring/roller assembly on the shaft and the plain outer ring in the housing independently; check that the outer ring is free to float the specified amount after closing the housing — a pinched outer ring turns the floating bearing into an accidental locating one.", "Relubricate NU2310 with the shaft turning so fresh grease or oil reaches the full 40 mm roller length; grease forced into a stationary row packs the entry and leaves the far side of the 50 mm bore starved.", "Order clearance for the fit: a rotating interference inner ring on a 50 mm shaft plus thermal growth consumes CN play, so C3 is the normal industrial default and C4 serves hot or vibratory mounts; CN suits loose outer-ring floating arrangements in bored housings.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU2310; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope." ], "faq": [ { "q": "What are the dimensions of an NU2310 cylindrical roller bearing?", "a": "An NU2310 single-row cylindrical roller bearing per ISO 15 has a 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in), a 30.0 mm radial section and roughly 1539 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2310 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 10: 10 × 5 = 50 mm. The 110 mm OD and 40 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2310) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2310 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2310E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 50×110×40 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2310E", "NU2310-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2311", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1960, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2311 are bore code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 43 mm width — 2.165 × 4.724 × 1.693 in, with a 32.5 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "wind turbine gearbox intermediate shafts", "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives" ], "failure_modes": [ "fretting corrosion on an interference inner-ring seat that creeps under a loose fit", "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load" ], "pitfalls": [ "On this 55 mm-bore NU2311, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 55 mm shaft reaches operating temperature.", "The NU23 wide medium series (55×120×43 mm) packs the highest rating of the 55 mm-bore cylindrical rows into the NU3 housing bore; the 32.5 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU311.", "Check the shoulder geometry for NU2311: a generous fillet on the 55 mm shaft looks strong but stops the inner ring seating home; use the catalogue corner-relief radius and a withdrawal groove so the outer ring presses flush in the 120 mm, 43 mm-wide housing bore.", "Large NU2311 rings need real draw-up force: use a sleeve or hydraulic press against the inner ring face only, verify the 55 mm seat temperature before assembly, and never strike the roller cage — a dented cage window on the 43 mm-wide set locks the rollers at the first hot run.", "When reusing separable NU2311 rings, keep the matched pair together and inspect both seats: a crept inner ring frets a polished groove into the 55 mm journal that a new bearing will repeat unless the shaft is repaired or reclaimed.", "The E suffix denotes a reinforced design with larger rollers and higher rating than the basic NU2311; never pair a standard and an E row on the same shaft — unequal stiffness splits the load unevenly, and the two are not life-equivalent despite the same envelope.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU2311: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 55 mm bore band rather than extrapolating ball-bearing practice." ], "faq": [ { "q": "What are the dimensions of an NU2311 cylindrical roller bearing?", "a": "An NU2311 single-row cylindrical roller bearing per ISO 15 has a 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in), a 32.5 mm radial section and roughly 1960 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2311 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 11: 11 × 5 = 55 mm. The 120 mm OD and 43 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2311) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2311 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2311E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 55×120×43 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2311E", "NU2311-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "NU2312", "brand": "GENERIC-ISO", "series": "NU2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2452, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the NU2300-series (ISO 15 dimension series) the leading NU marks a single-row cylindrical roller: the outer ring has two integral shoulders and the inner ring none, so the inner-ring/roller assembly floats axially both ways and the bearing locates radially only; the last two digits of NU2312 are bore code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 46 mm width — 2.362 × 5.118 × 1.811 in, with a 35.0 mm radial section height. Straight cylindrical rollers give line contact for high radial capacity at low friction, with no self-alignment; catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 clearance. NJ adds one inner shoulder (one-direction location), NUP two shoulders (full location); E denotes a reinforced roller complement — verify against the actual load direction.", "applications": [ "industrial helical and planetary gearboxes", "medium electric motor drives", "centrifugal pump and compressor shafts", "machine tool gearboxes and feed drives", "conveyor and hoist gearcase shafts" ], "failure_modes": [ "false brinelling indentations at the roller pitch when an idle bearing sits in machine vibration", "inner-ring shoulder damage from cold mounting force transmitted through the roller set", "thermal seizure when an interference fit plus hot running removes all residual C3 clearance", "roller and raceway smearing when a lightly loaded NU row skids at start-up or below the minimum load", "edge loading and rib spalling from shaft-to-housing misalignment — cylindrical rollers run on line contact and cannot self-align" ], "pitfalls": [ "On this 60 mm-bore NU2312, set C3 as the default for an interference inner-ring fit and recheck play after mounting; a row that turned freely on the bench can be fully clamped once the 60 mm shaft reaches operating temperature.", "The NU23 wide medium series (60×130×46 mm) packs the highest rating of the 60 mm-bore cylindrical rows into the NU3 housing bore; the 35.0 mm section and wide roller set tolerate no misalignment, so align the seats before selecting it over an NU312.", "The 46 mm-wide NU2312 seats against shaft and housing shoulders whose fillet must clear the ring chamfer: keep the corner radius inside the catalogue limit so the 60 mm bore and 130 mm OD faces abut square — an oversized radius lifts the ring and edge-loads the 35.0 mm section.", "For the interference inner ring of NU2312, heat to 80–100 °C with an induction heater (never a flame) and slide it dry to the 60 mm shaft shoulder; the roller assembly is fitted separately, and hammering cold through the 130 mm ring dents the raceways.", "Read the damage on a removed NU2312: uniform roller smearing points to minimum-load skidding, while spalling on one edge of the 130 mm raceway means misalignment or a tilted housing face — the two failures need opposite corrections, so inspect before ordering the replacement fit.", "At high speed, oil lubrication or a low-friction cage beats a grease-packed stamped-cage NU2312: line-contact rollers churn grease hard, so follow the catalogue speed factor (n × dm) and preload the oil jet for sizes above the 60 mm bore band rather than extrapolating ball-bearing practice.", "Choose the ring design for the locating task: a plain NU2312 (NU) floats axially in both directions and is the classic non-locating bearing of a two-bearing shaft; NJ locates in one direction, and NUP (or NJ + HJ angle ring) locates in both — do not use an NU row where the shaft needs axial location." ], "faq": [ { "q": "What are the dimensions of an NU2312 cylindrical roller bearing?", "a": "An NU2312 single-row cylindrical roller bearing per ISO 15 has a 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in), a 35.0 mm radial section and roughly 2452 g geometry-based estimated mass; catalogue masses vary with cage and E design." }, { "q": "How does the NU2312 bore code work?", "a": "The letters give the ring/shoulder design (NU = axially free, NJ = one inner shoulder, NUP = two shoulders) and the last two digits are bore code 12: 12 × 5 = 60 mm. The 130 mm OD and 46 mm width come from the ISO 15 dimension series (NU2300), which shares its boundary plan with the 6-series deep-groove envelopes." }, { "q": "What is the difference between NU, NJ, N and NUP designs?", "a": "NU (like the NU2312) has a shoulderless inner ring and floats axially in both directions; NJ has one integral inner-ring shoulder and locates the shaft in one direction; N has two inner shoulders and a shoulderless outer ring (mirror of NU); NUP adds a second, loose shoulder so the inner ring locates in both directions. Select by the shaft locating scheme, not by load rating — the envelopes are identical." }, { "q": "Can an NU2312 take axial load or misalignment?", "a": "No thrust in the NU design: any sustained axial force scores the roller ends and ring flanges, so locate the shaft with an NJ/NUP row, a paired angular-contact bearing or a deep-groove row elsewhere. Misalignment is likewise not tolerated — line contact between cylindrical rollers and raceways edges under even small angular errors; use a spherical roller bearing where shaft deflection or housing misalignment is expected." }, { "q": "What does the E suffix mean and which clearance should be ordered?", "a": "E (as in NU2312E) is the reinforced design: larger/optimised rollers raise the basic load rating over the basic designation in the same 60×130×46 mm envelope. For clearance, C3 is the usual default with an interference fit on a rotating inner ring because fit and thermal growth reduce residual play; use CN mainly for loose floating outer-ring mounts and C4 for hot or vibratory duty." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-crb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "NU2312E", "NU2312-E" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "16002", "brand": "FAG", "manufacturer_designation": "FAG 16002", "series": "16000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.59, "static_load_kN": 2.84, "limiting_speed_rpm": 33500, "reference_speed_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16002.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 15 mm bore shares the 32 mm outside diameter of the 6002 but is only 8 mm wide; a 6002 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16002 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16002 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16002 bearing?", "a": "A 16002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 8 mm width (0.591 × 1.26 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16002 mean?", "a": "A bare 16002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 15 mm bore?", "a": "160 is the narrow extra-light section: 32×8 mm with an 8.5 mm radial section at 15 mm bore. It has the same bore and outside diameter as the 6002 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16002?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16002 — the open (unsealed) execution, 15×32×8 mm per ISO 15. Quoted values: C 5.59 kN, C0 2.84 kN, mass 25 g. Limiting speed 33500 rpm, reference speed 20000 rpm. The industry-neutral page spelling 16002 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16002", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16003", "brand": "FAG", "manufacturer_designation": "FAG 16003", "series": "16000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6, "static_load_kN": 3.25, "limiting_speed_rpm": 31000, "reference_speed_rpm": 17700, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16003.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 17 mm bore shares the 35 mm outside diameter of the 6003 but is only 8 mm wide; a 6003 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16003 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×35×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16003 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16003.", "The open 16003 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16003 bearing?", "a": "A 16003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 8 mm width (0.669 × 1.378 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16003 mean?", "a": "A bare 16003 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 17 mm bore?", "a": "160 is the narrow extra-light section: 35×8 mm with a 9.0 mm radial section at 17 mm bore. It has the same bore and outside diameter as the 6003 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16003?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16003 — the open (unsealed) execution, 17×35×8 mm per ISO 15. Quoted values: C 6 kN, C0 3.25 kN, mass 32 g. Limiting speed 31000 rpm, reference speed 17700 rpm. The industry-neutral page spelling 16003 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16003", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16004", "brand": "FAG", "manufacturer_designation": "FAG 16004", "series": "16000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.91, "static_load_kN": 4.48, "limiting_speed_rpm": 26000, "reference_speed_rpm": 13800, "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16004.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16004; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 20 mm bore shares the 42 mm outside diameter of the 6004 but is only 8 mm wide; a 6004 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16004 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16004 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16004 bearing?", "a": "A 16004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 8 mm width (0.787 × 1.654 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16004 bore code work?", "a": "The last two digits of 16004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16004 mean?", "a": "A bare 16004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 20 mm bore?", "a": "160 is the narrow extra-light section: 42×8 mm with an 11.0 mm radial section at 20 mm bore. It has the same bore and outside diameter as the 6004 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16004?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16004 — the open (unsealed) execution, 20×42×8 mm per ISO 15. Quoted values: C 7.91 kN, C0 4.48 kN, mass 48 g. Limiting speed 26000 rpm, reference speed 13800 rpm. The industry-neutral page spelling 16004 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16004", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16005", "brand": "FAG", "manufacturer_designation": "FAG 16005", "series": "16000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.86, "static_load_kN": 5.61, "limiting_speed_rpm": 22200, "reference_speed_rpm": 11600, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16005.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 25 mm bore shares the 47 mm outside diameter of the 6005 but is only 8 mm wide; a 6005 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16005 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16005 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16005-C3. No clearance suffix means normal CN clearance.", "The open 16005 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16005 bearing?", "a": "A 16005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 8 mm width (0.984 × 1.85 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16005 bore code work?", "a": "The last two digits of 16005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16005 mean?", "a": "A bare 16005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 25 mm bore?", "a": "160 is the narrow extra-light section: 47×8 mm with an 11.0 mm radial section at 25 mm bore. It has the same bore and outside diameter as the 6005 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16005?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16005 — the open (unsealed) execution, 25×47×8 mm per ISO 15. Quoted values: C 8.86 kN, C0 5.61 kN, mass 53 g. Limiting speed 22200 rpm, reference speed 11600 rpm. The industry-neutral page spelling 16005 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16005", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16006", "brand": "FAG", "manufacturer_designation": "FAG 16006", "series": "16000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.22, "static_load_kN": 7.39, "limiting_speed_rpm": 18500, "reference_speed_rpm": 10000, "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16006.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16006; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 30 mm bore shares the 55 mm outside diameter of the 6006 but is only 9 mm wide; a 6006 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16006 units.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16006 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16006 bearing?", "a": "A 16006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 9 mm width (1.181 × 2.165 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16006 bore code work?", "a": "The last two digits of 16006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16006 mean?", "a": "A bare 16006 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 30 mm bore?", "a": "160 is the narrow extra-light section: 55×9 mm with a 12.5 mm radial section at 30 mm bore. It has the same bore and outside diameter as the 6006 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16006?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16006 — the open (unsealed) execution, 30×55×9 mm per ISO 15. Quoted values: C 11.22 kN, C0 7.39 kN, mass 82 g. Limiting speed 18500 rpm, reference speed 10000 rpm. The industry-neutral page spelling 16006 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16006", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16007", "brand": "FAG", "manufacturer_designation": "FAG 16007", "series": "16000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.26, "static_load_kN": 8.8, "limiting_speed_rpm": 16700, "reference_speed_rpm": 8900, "weight_g": 107, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16007.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16007; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 35 mm bore shares the 62 mm outside diameter of the 6007 but is only 9 mm wide; a 6007 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16007 units.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16007 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16007 bearing?", "a": "A 16007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 9 mm width (1.378 × 2.441 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16007 bore code work?", "a": "The last two digits of 16007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16007 mean?", "a": "A bare 16007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 35 mm bore?", "a": "160 is the narrow extra-light section: 62×9 mm with a 13.5 mm radial section at 35 mm bore. It has the same bore and outside diameter as the 6007 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16007?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16007 — the open (unsealed) execution, 35×62×9 mm per ISO 15. Quoted values: C 12.26 kN, C0 8.8 kN, mass 107 g. Limiting speed 16700 rpm, reference speed 8900 rpm. The industry-neutral page spelling 16007 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16007", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16008", "brand": "FAG", "manufacturer_designation": "FAG 16008", "series": "16000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.62, "static_load_kN": 9.65, "limiting_speed_rpm": 15200, "reference_speed_rpm": 7800, "weight_g": 127, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16008.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 40 mm bore shares the 68 mm outside diameter of the 6008 but is only 9 mm wide; a 6008 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16008 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16008 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16008 bearing?", "a": "A 16008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 9 mm width (1.575 × 2.677 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16008 bore code work?", "a": "The last two digits of 16008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16008 mean?", "a": "A bare 16008 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 40 mm bore?", "a": "160 is the narrow extra-light section: 68×9 mm with a 14.0 mm radial section at 40 mm bore. It has the same bore and outside diameter as the 6008 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16008?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16008 — the open (unsealed) execution, 40×68×9 mm per ISO 15. Quoted values: C 12.62 kN, C0 9.65 kN, mass 127 g. Limiting speed 15200 rpm, reference speed 7800 rpm. The industry-neutral page spelling 16008 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16008", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16011", "brand": "FAG", "manufacturer_designation": "FAG 16011", "series": "16000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.3, "static_load_kN": 16.3, "limiting_speed_rpm": 10900, "reference_speed_rpm": 6000, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16011.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16011 with C3 for those conditions.", "The 160xx narrow section at 55 mm bore shares the 90 mm outside diameter of the 6011 but is only 11 mm wide; a 6011 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16011 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16011-C3. No clearance suffix means normal CN clearance.", "The open 16011 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16011 bearing?", "a": "A 16011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 11 mm width (2.165 × 3.543 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16011 bore code work?", "a": "The last two digits of 16011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16011 mean?", "a": "A bare 16011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 55 mm bore?", "a": "160 is the narrow extra-light section: 90×11 mm with a 17.5 mm radial section at 55 mm bore. It has the same bore and outside diameter as the 6011 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16011?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16011 — the open (unsealed) execution, 55×90×11 mm per ISO 15. Quoted values: C 19.3 kN, C0 16.3 kN, mass 260 g. Limiting speed 10900 rpm, reference speed 6000 rpm. The industry-neutral page spelling 16011 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16011", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16026", "brand": "FAG", "manufacturer_designation": "FAG 16026", "series": "16000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 84, "static_load_kN": 82, "limiting_speed_rpm": 4650, "reference_speed_rpm": 3450, "weight_g": 2370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16026.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 130 mm bore shares the 200 mm outside diameter of the 6026 but is only 22 mm wide; a 6026 in a 22 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16026 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16026 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16026 bearing?", "a": "A 16026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 22 mm width (5.118 × 7.874 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16026 bore code work?", "a": "The last two digits of 16026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16026 mean?", "a": "A bare 16026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 130 mm bore?", "a": "160 is the narrow extra-light section: 200×22 mm with a 35.0 mm radial section at 130 mm bore. It has the same bore and outside diameter as the 6026 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16026?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16026 — the open (unsealed) execution, 130×200×22 mm per ISO 15. Quoted values: C 84 kN, C0 82 kN, mass 2370 g. Limiting speed 4650 rpm, reference speed 3450 rpm. The industry-neutral page spelling 16026 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16026", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16028", "brand": "FAG", "manufacturer_designation": "FAG 16028", "series": "16000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 86, "static_load_kN": 87, "limiting_speed_rpm": 4400, "reference_speed_rpm": 3200, "weight_g": 2540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16028.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 140 mm bore shares the 210 mm outside diameter of the 6028 but is only 22 mm wide; a 6028 in a 22 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16028 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16028 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16028 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16028 bearing?", "a": "A 16028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 22 mm width (5.512 × 8.268 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16028 bore code work?", "a": "The last two digits of 16028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16028 mean?", "a": "A bare 16028 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 140 mm bore?", "a": "160 is the narrow extra-light section: 210×22 mm with a 35.0 mm radial section at 140 mm bore. It has the same bore and outside diameter as the 6028 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16028?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16028 — the open (unsealed) execution, 140×210×22 mm per ISO 15. Quoted values: C 86 kN, C0 87 kN, mass 2540 g. Limiting speed 4400 rpm, reference speed 3200 rpm. The industry-neutral page spelling 16028 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16028", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16030", "brand": "FAG", "manufacturer_designation": "FAG 16030", "series": "16000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98, "static_load_kN": 99, "limiting_speed_rpm": 4050, "reference_speed_rpm": 3100, "weight_g": 3170, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16030.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 150 mm bore shares the 225 mm outside diameter of the 6030 but is only 24 mm wide; a 6030 in a 24 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16030 units.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16030 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16030 bearing?", "a": "A 16030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 24 mm width (5.906 × 8.858 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16030 bore code work?", "a": "The last two digits of 16030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16030 mean?", "a": "A bare 16030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 150 mm bore?", "a": "160 is the narrow extra-light section: 225×24 mm with a 37.5 mm radial section at 150 mm bore. It has the same bore and outside diameter as the 6030 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16030?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16030 — the open (unsealed) execution, 150×225×24 mm per ISO 15. Quoted values: C 98 kN, C0 99 kN, mass 3170 g. Limiting speed 4050 rpm, reference speed 3100 rpm. The industry-neutral page spelling 16030 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16030", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16032", "brand": "FAG", "manufacturer_designation": "FAG 16032", "series": "16000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 109, "static_load_kN": 114, "limiting_speed_rpm": 3800, "reference_speed_rpm": 2950, "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16032.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 160 mm bore shares the 240 mm outside diameter of the 6032 but is only 25 mm wide; a 6032 in a 25 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16032 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16032 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16032 bearing?", "a": "A 16032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 25 mm width (6.299 × 9.449 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16032 bore code work?", "a": "The last two digits of 16032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16032 mean?", "a": "A bare 16032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 160 mm bore?", "a": "160 is the narrow extra-light section: 240×25 mm with a 40.0 mm radial section at 160 mm bore. It has the same bore and outside diameter as the 6032 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16032?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16032 — the open (unsealed) execution, 160×240×25 mm per ISO 15. Quoted values: C 109 kN, C0 114 kN, mass 3750 g. Limiting speed 3800 rpm, reference speed 2950 rpm. The industry-neutral page spelling 16032 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16032", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16034", "brand": "FAG", "manufacturer_designation": "FAG 16034", "series": "16000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 136, "limiting_speed_rpm": 3500, "reference_speed_rpm": 2850, "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16034.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 170 mm bore shares the 260 mm outside diameter of the 6034 but is only 28 mm wide; a 6034 in a 28 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16034 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16034 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16034 bearing?", "a": "A 16034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 28 mm width (6.693 × 10.236 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16034 bore code work?", "a": "The last two digits of 16034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16034 mean?", "a": "A bare 16034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 170 mm bore?", "a": "160 is the narrow extra-light section: 260×28 mm with a 45.0 mm radial section at 170 mm bore. It has the same bore and outside diameter as the 6034 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16034?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16034 — the open (unsealed) execution, 170×260×28 mm per ISO 15. Quoted values: C 131 kN, C0 136 kN, mass 5100 g. Limiting speed 3500 rpm, reference speed 2850 rpm. The industry-neutral page spelling 16034 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16034", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "6034-2RS", "brand": "FAG", "manufacturer_designation": "FAG 6034-2RSR", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 179, "static_load_kN": 172, "limiting_speed_rpm": 1340, "weight_g": 7120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG's catalogue order number is 6034-2RSR (suffix -2RSR), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6034-2RS runs slower and cooler-limited than the open 6034; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6034-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6034-2RS.", "FAG catalogues the contact-sealed version as 6034-2RSR (suffix -2RSR, or -2HRS on Generation-C sizes), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing." ], "faq": [ { "q": "What are the dimensions of a 6034-2RS bearing?", "a": "A 6034-2RS deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6034-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the FAG designation and catalogue data for 6034-2RS?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 6034-2RSR — two contacting rubber seals over a lifetime grease fill (FAG suffix -2RSR/-2HRS), 170×260×42 mm per ISO 15. Quoted values: C 179 kN, C0 172 kN, mass 7120 g. Limiting speed 1340 rpm. The industry-neutral page spelling 6034-2RS follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [ "6034-2rsr" ], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16036", "brand": "FAG", "manufacturer_designation": "FAG 16036", "series": "16000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 140, "static_load_kN": 146, "limiting_speed_rpm": 3350, "reference_speed_rpm": 2950, "weight_g": 6860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16036.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 180 mm bore shares the 280 mm outside diameter of the 6036 but is only 31 mm wide; a 6036 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16036 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16036 units.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16036 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16036 bearing?", "a": "A 16036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 31 mm width (7.087 × 11.024 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16036 bore code work?", "a": "The last two digits of 16036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16036 mean?", "a": "A bare 16036 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 180 mm bore?", "a": "160 is the narrow extra-light section: 280×31 mm with a 50.0 mm radial section at 180 mm bore. It has the same bore and outside diameter as the 6036 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16036?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16036 — the open (unsealed) execution, 180×280×31 mm per ISO 15. Quoted values: C 140 kN, C0 146 kN, mass 6860 g. Limiting speed 3350 rpm, reference speed 2950 rpm. The industry-neutral page spelling 16036 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16036", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16038", "brand": "FAG", "manufacturer_designation": "FAG 16038", "series": "16000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 168, "limiting_speed_rpm": 3100, "reference_speed_rpm": 2650, "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16038.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 190 mm bore shares the 290 mm outside diameter of the 6038 but is only 31 mm wide; a 6038 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16038 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16038 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16038 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16038 bearing?", "a": "A 16038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 31 mm width (7.48 × 11.417 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16038 bore code work?", "a": "The last two digits of 16038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16038 mean?", "a": "A bare 16038 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 190 mm bore?", "a": "160 is the narrow extra-light section: 290×31 mm with a 50.0 mm radial section at 190 mm bore. It has the same bore and outside diameter as the 6038 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16038?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16038 — the open (unsealed) execution, 190×290×31 mm per ISO 15. Quoted values: C 158 kN, C0 168 kN, mass 7040 g. Limiting speed 3100 rpm, reference speed 2650 rpm. The industry-neutral page spelling 16038 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16038", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published" }, { "sku": "16040", "brand": "FAG", "manufacturer_designation": "FAG 16040", "series": "16000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 186, "static_load_kN": 202, "limiting_speed_rpm": 2850, "reference_speed_rpm": 2470, "weight_g": 8970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16040.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 200 mm bore shares the 310 mm outside diameter of the 6040 but is only 34 mm wide; a 6040 in a 34 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16040 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16040 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16040 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal." ], "faq": [ { "q": "What are the dimensions of a 16040 bearing?", "a": "A 16040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 34 mm width (7.874 × 12.205 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16040 bore code work?", "a": "The last two digits of 16040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16040 mean?", "a": "A bare 16040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 200 mm bore?", "a": "160 is the narrow extra-light section: 310×34 mm with a 55.0 mm radial section at 200 mm bore. It has the same bore and outside diameter as the 6040 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range." }, { "q": "What is the FAG designation and catalogue data for 16040?", "a": "In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16040 — the open (unsealed) execution, 200×310×34 mm per ISO 15. Quoted values: C 186 kN, C0 202 kN, mass 8970 g. Limiting speed 2850 rpm, reference speed 2470 rpm. The industry-neutral page spelling 16040 follows the seal-suffix convention used across this site, not FAG order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16040", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6404-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 364, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6404-2RS runs slower and cooler-limited than the open 6404; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6404-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6404-2RS bearing?", "a": "A 6404-2RS deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 364 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6404-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6404 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6404 uses the same ISO 15 envelope (20×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 30.7, "static_load_kN": 15, "load_derived": true }, { "sku": "6405-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 486, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6405-2RS runs slower and cooler-limited than the open 6405; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6405-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6405-2RS bearing?", "a": "A 6405-2RS deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 486 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6405-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6405 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6405 uses the same ISO 15 envelope (25×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "load_derived": true }, { "sku": "6406-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 664, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6406-2RS runs slower and cooler-limited than the open 6406; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6406-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6406-2RS bearing?", "a": "A 6406-2RS deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 664 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6406-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6406 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6406 uses the same ISO 15 envelope (30×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "load_derived": true }, { "sku": "6407-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 879, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6407-2RS runs slower and cooler-limited than the open 6407; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6407-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6407-2RS." ], "faq": [ { "q": "What are the dimensions of a 6407-2RS bearing?", "a": "A 6407-2RS deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 879 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6407-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6407 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 55.3, "static_load_kN": 31, "load_derived": true }, { "sku": "6408-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6408-2RS runs slower and cooler-limited than the open 6408; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6408-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6408-2RS bearing?", "a": "A 6408-2RS deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6408-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6408 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6408 uses the same ISO 15 envelope (40×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "load_derived": true }, { "sku": "6409-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1438, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6409-2RS runs slower and cooler-limited than the open 6409; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6409-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6409-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6409-2RS bearing?", "a": "A 6409-2RS deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1438 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6409-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6409 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6409 uses the same ISO 15 envelope (45×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 76.1, "static_load_kN": 45, "load_derived": true }, { "sku": "6410-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1789, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6410-2RS runs slower and cooler-limited than the open 6410; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6410-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6410-2RS bearing?", "a": "A 6410-2RS deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1789 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6410-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6410 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6410 uses the same ISO 15 envelope (50×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 87.1, "static_load_kN": 52, "load_derived": true }, { "sku": "6411-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2192, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6411-2RS runs slower and cooler-limited than the open 6411; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6411-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6411-2RS bearing?", "a": "A 6411-2RS deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2192 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6411-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6411 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6411 uses the same ISO 15 envelope (55×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 99.5, "static_load_kN": 62, "load_derived": true }, { "sku": "6412-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2651, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6412-2RS runs slower and cooler-limited than the open 6412; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6412-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6412-2RS bearing?", "a": "A 6412-2RS deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2651 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6412-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6412 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6412 uses the same ISO 15 envelope (60×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 108, "static_load_kN": 69.5, "load_derived": true }, { "sku": "6413-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6413-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6413-2RS for that.", "Shielded 6413-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6413-ZZ bearing?", "a": "A 6413-ZZ deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6413-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 119, "static_load_kN": 78, "load_derived": true }, { "sku": "6413-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6413-2RS runs slower and cooler-limited than the open 6413; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6413-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6413-2RS." ], "faq": [ { "q": "What are the dimensions of a 6413-2RS bearing?", "a": "A 6413-2RS deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6413-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6413 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 119, "static_load_kN": 78, "load_derived": true }, { "sku": "6414-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6414-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6414-2RS for that.", "Shielded 6414-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6414-ZZ bearing?", "a": "A 6414-ZZ deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6414-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6414 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 143, "static_load_kN": 104, "load_derived": true }, { "sku": "6414-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6414-2RS runs slower and cooler-limited than the open 6414; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6414-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6414-2RS bearing?", "a": "A 6414-2RS deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6414-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6414 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-23", "last_verified": "2026-09-23", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 143, "static_load_kN": 104, "load_derived": true }, { "sku": "6400", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6400 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6400 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6400 bearing?", "a": "A 6400 deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6400 mean?", "a": "A bare 6400 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6400-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6400-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6400-2RS for that.", "Shielded 6400-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6400-ZZ bearing?", "a": "A 6400-ZZ deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6400-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6400-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 10, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6400-2RS runs slower and cooler-limited than the open 6400; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6400-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6400-2RS bearing?", "a": "A 6400-2RS deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6400 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6400-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 10 mm bore?", "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6400 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6400", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6401 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×48×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6401 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6401-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6401 bearing?", "a": "A 6401 deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6401 mean?", "a": "A bare 6401 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6401-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6401-2RS for that.", "Shielded 6401-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6401-ZZ bearing?", "a": "A 6401-ZZ deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6401-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6401-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 12, "D_mm": 48, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 121, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6401-2RS runs slower and cooler-limited than the open 6401; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6401-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 48 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6401-2RS." ], "faq": [ { "q": "What are the dimensions of a 6401-2RS bearing?", "a": "A 6401-2RS deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6401 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6401-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 12 mm bore?", "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6401 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6401", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6402 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6402 units.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6402 bearing?", "a": "A 6402 deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6402 mean?", "a": "A bare 6402 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6402-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6402-2RS for that.", "Shielded 6402-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6402-ZZ bearing?", "a": "A 6402-ZZ deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6402-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6402-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 15, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6402-2RS runs slower and cooler-limited than the open 6402; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6402-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6402-2RS bearing?", "a": "A 6402-2RS deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6402 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6402-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 15 mm bore?", "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6402 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6402", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6403-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 242, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6403-2RS runs slower and cooler-limited than the open 6403; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6403-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6403-2RS bearing?", "a": "A 6403-2RS deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 242 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6403-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6403 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6403", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 22.9, "static_load_kN": 10.8, "load_derived": true }, { "sku": "6415-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5496, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6415-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6415-2RS for that.", "Shielded 6415-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6415-ZZ." ], "faq": [ { "q": "What are the dimensions of a 6415-ZZ bearing?", "a": "A 6415-ZZ deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6415-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 153, "static_load_kN": 114, "load_derived": true }, { "sku": "6415-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5496, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6415-2RS runs slower and cooler-limited than the open 6415; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6415-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6415-2RS-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6415-2RS bearing?", "a": "A 6415-2RS deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6415-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6415 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6415", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 153, "static_load_kN": 114, "load_derived": true }, { "sku": "6416-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6463, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6416-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6416-2RS for that.", "Shielded 6416-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6416-ZZ bearing?", "a": "A 6416-ZZ deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6416-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 163, "static_load_kN": 125, "load_derived": true }, { "sku": "6416-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6463, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6416-2RS runs slower and cooler-limited than the open 6416; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6416-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6416-2RS bearing?", "a": "A 6416-2RS deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6416-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6416 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6416", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 163, "static_load_kN": 125, "load_derived": true }, { "sku": "6417-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7684, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6417-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6417-2RS for that.", "Shielded 6417-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6417-ZZ-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6417-ZZ bearing?", "a": "A 6417-ZZ deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6417-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6417", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 174, "static_load_kN": 137, "load_derived": true }, { "sku": "6417-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7684, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6417-2RS runs slower and cooler-limited than the open 6417; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6417-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6417-2RS bearing?", "a": "A 6417-2RS deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6417-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6417 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6417", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 174, "static_load_kN": 137, "load_derived": true }, { "sku": "6418-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6418-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6418-2RS for that.", "Shielded 6418-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6418-ZZ bearing?", "a": "A 6418-ZZ deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6418-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6418", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 186, "static_load_kN": 150, "load_derived": true }, { "sku": "6418-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6418-2RS runs slower and cooler-limited than the open 6418; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6418-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6418-2RS bearing?", "a": "A 6418-2RS deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6418-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6418 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6418", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "dynamic_load_kN": 186, "static_load_kN": 150, "load_derived": true }, { "sku": "6419", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6419 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×240×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6419 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6419-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 6419 bearing?", "a": "A 6419 deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6419 mean?", "a": "A bare 6419 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6419-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6419-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6419-2RS for that.", "Shielded 6419-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 6419-ZZ bearing?", "a": "A 6419-ZZ deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6419-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6419-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 95, "D_mm": 240, "B_mm": 55, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10707, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6419-2RS runs slower and cooler-limited than the open 6419; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6419-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6419-2RS." ], "faq": [ { "q": "What are the dimensions of a 6419-2RS bearing?", "a": "A 6419-2RS deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6419 bore code work?", "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6419-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 95 mm bore?", "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6419 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6419", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6420 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×250×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6420 units.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 6420 bearing?", "a": "A 6420 deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6420 mean?", "a": "A bare 6420 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420-ZZ", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6420-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6420-2RS for that.", "Shielded 6420-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 6420-ZZ bearing?", "a": "A 6420-ZZ deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6420-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6420-2RS", "brand": "GENERIC-ISO", "series": "6400-series", "type": "deep_groove", "d_mm": 100, "D_mm": 250, "B_mm": 58, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 12203, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "Contact seals add drag and heat: 6420-2RS runs slower and cooler-limited than the open 6420; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6420-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life." ], "faq": [ { "q": "What are the dimensions of a 6420-2RS bearing?", "a": "A 6420-2RS deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6420 bore code work?", "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6420-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6400 compare with other series at the same 100 mm bore?", "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "Are 6420 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)." } ], "cross_ref": [ { "equiv_sku": "6420", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6006", "brand": "NSK", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 116, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), VV (non-contact seals) and DDU (contact seals).", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6006 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6006 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 14.6/8.3 kN ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6006 bearing?", "a": "A 6006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6006 mean?", "a": "A bare 6006 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6006?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6006 — the open (unsealed) execution, 30×55×13 mm per ISO 15. Quoted values: C 14.6 kN, C0 8.3 kN, mass 116 g. The industry-neutral page spelling 6006 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6006", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6006", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 8.3 }, { "sku": "6009-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6009VV", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23, "static_load_kN": 15.2, "weight_g": 241, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6009-RSR run faster than contact-seal 6009-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6009-2RS instead.", "The non-contact lip of 6009-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6009VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 23/15.2 kN ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6009-RSR bearing?", "a": "A 6009-RSR deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6009-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6009-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6009VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×75×16 mm per ISO 15. Quoted values: C 23 kN, C0 15.2 kN, mass 241 g. The industry-neutral page spelling 6009-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009VV" ], "locale_variants": {} }, { "sku": "6011-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6011VV", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 21.2, "weight_g": 381, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6011-RSR run faster than contact-seal 6011-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6011-2RS instead.", "The non-contact lip of 6011-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6011VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 31/21.2 kN ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6011-RSR bearing?", "a": "A 6011-RSR deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6011-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6011-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6011VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×90×18 mm per ISO 15. Quoted values: C 31 kN, C0 21.2 kN, mass 381 g. The industry-neutral page spelling 6011-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011VV" ], "locale_variants": {} }, { "sku": "6013-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6013VV", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 33.5, "static_load_kN": 25.2, "weight_g": 439, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6013-RSR run faster than contact-seal 6013-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6013-2RS instead.", "The non-contact lip of 6013-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6013VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 33.5/25.2 kN ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6013-RSR bearing?", "a": "A 6013-RSR deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6013-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6013-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6013VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×100×18 mm per ISO 15. Quoted values: C 33.5 kN, C0 25.2 kN, mass 439 g. The industry-neutral page spelling 6013-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013VV" ], "locale_variants": {} }, { "sku": "6014-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6014VV", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 31, "weight_g": 608, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6014-RSR run faster than contact-seal 6014-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6014-2RS instead.", "The non-contact lip of 6014-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014-RSR.", "NSK catalogues this low-friction non-contact seal as 6014VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 42/31 kN ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6014-RSR bearing?", "a": "A 6014-RSR deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6014-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6014-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6014VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×110×20 mm per ISO 15. Quoted values: C 42 kN, C0 31 kN, mass 608 g. The industry-neutral page spelling 6014-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014VV" ], "locale_variants": {} }, { "sku": "6016-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6016VV", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 40, "weight_g": 872, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6016-RSR run faster than contact-seal 6016-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6016-2RS instead.", "The non-contact lip of 6016-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6016-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6016VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 52.5/40 kN ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6016-RSR bearing?", "a": "A 6016-RSR deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6016-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6016-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6016VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×125×22 mm per ISO 15. Quoted values: C 52.5 kN, C0 40 kN, mass 872 g. The industry-neutral page spelling 6016-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016VV" ], "locale_variants": {} }, { "sku": "6017-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6017VV", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 54.5, "static_load_kN": 43, "weight_g": 918, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6017-RSR run faster than contact-seal 6017-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6017-2RS instead.", "The non-contact lip of 6017-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6017VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 54.5/43 kN ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6017-RSR bearing?", "a": "A 6017-RSR deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6017-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6017-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6017VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×130×22 mm per ISO 15. Quoted values: C 54.5 kN, C0 43 kN, mass 918 g. The industry-neutral page spelling 6017-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6017VV" ], "locale_variants": {} }, { "sku": "6018-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6018VV", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64, "static_load_kN": 50, "weight_g": 1190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6018-RSR run faster than contact-seal 6018-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6018-2RS instead.", "The non-contact lip of 6018-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6018VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 64/50 kN ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6018-RSR bearing?", "a": "A 6018-RSR deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6018-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6018-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6018VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×140×24 mm per ISO 15. Quoted values: C 64 kN, C0 50 kN, mass 1190 g. The industry-neutral page spelling 6018-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6018VV" ], "locale_variants": {} }, { "sku": "6019-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6019VV", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 54, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6019-RSR run faster than contact-seal 6019-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6019-2RS instead.", "The non-contact lip of 6019-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6019VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66.5/54 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6019-RSR bearing?", "a": "A 6019-RSR deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6019-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6019-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6019VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×145×24 mm per ISO 15. Quoted values: C 66.5 kN, C0 54 kN, mass 1230 g. The industry-neutral page spelling 6019-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6019VV" ], "locale_variants": {} }, { "sku": "6020-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6020VV", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 54, "weight_g": 1290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6020-RSR run faster than contact-seal 6020-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6020-2RS instead.", "The non-contact lip of 6020-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6020-RSR.", "NSK catalogues this low-friction non-contact seal as 6020VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66/54 kN ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6020-RSR bearing?", "a": "A 6020-RSR deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6020-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6020-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6020VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×150×24 mm per ISO 15. Quoted values: C 66 kN, C0 54 kN, mass 1290 g. The industry-neutral page spelling 6020-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6020VV" ], "locale_variants": {} }, { "sku": "6021-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6021VV", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 79.5, "static_load_kN": 66, "weight_g": 1580, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6021-RSR run faster than contact-seal 6021-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6021-2RS instead.", "The non-contact lip of 6021-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6021VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 79.5/66 kN ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6021-RSR bearing?", "a": "A 6021-RSR deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6021-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6021-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6021VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×160×26 mm per ISO 15. Quoted values: C 79.5 kN, C0 66 kN, mass 1580 g. The industry-neutral page spelling 6021-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6021VV" ], "locale_variants": {} }, { "sku": "6022-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6022VV", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93, "static_load_kN": 73, "weight_g": 1940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6022-RSR run faster than contact-seal 6022-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6022-2RS instead.", "The non-contact lip of 6022-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6022-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6022VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 93/73 kN ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6022-RSR bearing?", "a": "A 6022-RSR deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6022-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6022-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6022VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×170×28 mm per ISO 15. Quoted values: C 93 kN, C0 73 kN, mass 1940 g. The industry-neutral page spelling 6022-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6022VV" ], "locale_variants": {} }, { "sku": "6024-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6024VV", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 97, "static_load_kN": 80, "weight_g": 2080, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6024-RSR run faster than contact-seal 6024-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6024-2RS instead.", "The non-contact lip of 6024-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6024VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 97/80 kN ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6024-RSR bearing?", "a": "A 6024-RSR deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6024-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6024-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6024VV — two low-friction non-contact rubber seals (NSK suffix VV), 120×180×28 mm per ISO 15. Quoted values: C 97 kN, C0 80 kN, mass 2080 g. The industry-neutral page spelling 6024-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024VV" ], "locale_variants": {} }, { "sku": "6030-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6030VV", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 138, "static_load_kN": 126, "weight_g": 4240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6030-RSR run faster than contact-seal 6030-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6030-2RS instead.", "The non-contact lip of 6030-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 150 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6030VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 138/126 kN ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6030-RSR bearing?", "a": "A 6030-RSR deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6030-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6030-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6030VV — two low-friction non-contact rubber seals (NSK suffix VV), 150×225×35 mm per ISO 15. Quoted values: C 138 kN, C0 126 kN, mass 4240 g. The industry-neutral page spelling 6030-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6030VV" ], "locale_variants": {} }, { "sku": "6034-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6034VV", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 177, "static_load_kN": 161, "weight_g": 6890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6034-RSR run faster than contact-seal 6034-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6034-2RS instead.", "The non-contact lip of 6034-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6034-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6034VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 177/161 kN ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6034-RSR bearing?", "a": "A 6034-RSR deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6034-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6034-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6034VV — two low-friction non-contact rubber seals (NSK suffix VV), 170×260×42 mm per ISO 15. Quoted values: C 177 kN, C0 161 kN, mass 6890 g. The industry-neutral page spelling 6034-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6034VV" ], "locale_variants": {} }, { "sku": "6034-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6034ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 177, "static_load_kN": 161, "weight_g": 6890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6034-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6034-2RS for that.", "Shielded 6034-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 42 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6034ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 177/161 kN ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6034-ZZ bearing?", "a": "A 6034-ZZ deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6034-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6034-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6034ZZ — two non-contact steel shields (NSK suffix ZZ), 170×260×42 mm per ISO 15. Quoted values: C 177 kN, C0 161 kN, mass 6890 g. The industry-neutral page spelling 6034-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6034ZZ" ], "locale_variants": {} }, { "sku": "6036-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6036VV", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 185, "weight_g": 8880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6036-RSR run faster than contact-seal 6036-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6036-2RS instead.", "The non-contact lip of 6036-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 180 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6036VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 198/185 kN ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6036-RSR bearing?", "a": "A 6036-RSR deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6036-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6036-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6036VV — two low-friction non-contact rubber seals (NSK suffix VV), 180×280×46 mm per ISO 15. Quoted values: C 198 kN, C0 185 kN, mass 8880 g. The industry-neutral page spelling 6036-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6036VV" ], "locale_variants": {} }, { "sku": "6036-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6036ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 185, "weight_g": 8880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6036-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6036-2RS for that.", "Shielded 6036-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6036-ZZ.", "NSK catalogues the shielded version as 6036ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 198/185 kN ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6036-ZZ bearing?", "a": "A 6036-ZZ deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6036-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6036-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6036ZZ — two non-contact steel shields (NSK suffix ZZ), 180×280×46 mm per ISO 15. Quoted values: C 198 kN, C0 185 kN, mass 8880 g. The industry-neutral page spelling 6036-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6036ZZ" ], "locale_variants": {} }, { "sku": "6038-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6038ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 207, "static_load_kN": 201, "weight_g": 9390, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6038-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6038-2RS for that.", "Shielded 6038-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6038-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6038ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 207/201 kN ratings, mass 9390 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6038ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6038-ZZ bearing?", "a": "A 6038-ZZ deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6038 bore code work?", "a": "The last two digits of 6038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6038-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 190 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (290×46 mm, 50.0 mm radial section) at 190 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6038-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6038ZZ — two non-contact steel shields (NSK suffix ZZ), 190×290×46 mm per ISO 15. Quoted values: C 207 kN, C0 201 kN, mass 9390 g. The industry-neutral page spelling 6038-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6038", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6038ZZ" ], "locale_variants": {} }, { "sku": "6040-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6040ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 228, "static_load_kN": 226, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6040-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6040-2RS for that.", "Shielded 6040-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6040ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 228/226 kN ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6040-ZZ bearing?", "a": "A 6040-ZZ deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6040 bore code work?", "a": "The last two digits of 6040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6040-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6040-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6040ZZ — two non-contact steel shields (NSK suffix ZZ), 200×310×51 mm per ISO 15. Quoted values: C 228 kN, C0 226 kN, mass 12000 g. The industry-neutral page spelling 6040-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6040", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6040ZZ" ], "locale_variants": {} }, { "sku": "6040", "brand": "NSK", "manufacturer_designation": "NSK 6040", "series": "6000-series", "type": "deep_groove", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 228, "static_load_kN": 226, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 200 mm bore uses a smaller 310 mm OD than a 6240; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6040 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6040 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6040-C3. No clearance suffix means normal CN clearance.", "The open 6040 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 228/226 kN ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6040 bearing?", "a": "A 6040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6040 bore code work?", "a": "The last two digits of 6040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6040 mean?", "a": "A bare 6040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 200 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6040?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6040 — the open (unsealed) execution, 200×310×51 mm per ISO 15. Quoted values: C 228 kN, C0 226 kN, mass 12000 g. The industry-neutral page spelling 6040 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6040", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6044-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6044ZZ", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 259, "static_load_kN": 271, "weight_g": 18600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6044-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6044-2RS for that.", "Shielded 6044-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6044-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6044ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 259/271 kN ratings, mass 18600 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6044ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6044-ZZ bearing?", "a": "A 6044-ZZ deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6044 bore code work?", "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6044-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NSK designation and catalogue data for 6044-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6044ZZ — two non-contact steel shields (NSK suffix ZZ), 220×340×56 mm per ISO 15. Quoted values: C 259 kN, C0 271 kN, mass 18600 g. The industry-neutral page spelling 6044-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6044", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6044ZZ" ], "locale_variants": {} }, { "sku": "61800-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6800VV", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.89, "static_load_kN": 0.84, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "RSR low-friction seals on 61800-RSR run faster than contact-seal 61800-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61800-2RS instead.", "The non-contact lip of 61800-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61800-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6800VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 1.89/0.84 kN ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61800-RSR bearing?", "a": "A 61800-RSR deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61800-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61800-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6800VV — two low-friction non-contact rubber seals (NSK suffix VV), 10×19×5 mm per ISO 15. Quoted values: C 1.89 kN, C0 0.84 kN, mass 5 g. The industry-neutral page spelling 61800-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6800VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6800VV" ], "locale_variants": {} }, { "sku": "61801-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6801VV", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.11, "static_load_kN": 1.04, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "RSR low-friction seals on 61801-RSR run faster than contact-seal 61801-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61801-2RS instead.", "The non-contact lip of 61801-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6801VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.11/1.04 kN ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61801-RSR bearing?", "a": "A 61801-RSR deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61801-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61801-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6801VV — two low-friction non-contact rubber seals (NSK suffix VV), 12×21×5 mm per ISO 15. Quoted values: C 2.11 kN, C0 1.04 kN, mass 6 g. The industry-neutral page spelling 61801-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6801VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6801VV" ], "locale_variants": {} }, { "sku": "61802-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6802VV", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.28, "static_load_kN": 1.26, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "RSR low-friction seals on 61802-RSR run faster than contact-seal 61802-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61802-2RS instead.", "The non-contact lip of 61802-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6802VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.28/1.26 kN ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61802-RSR bearing?", "a": "A 61802-RSR deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61802-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61802-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6802VV — two low-friction non-contact rubber seals (NSK suffix VV), 15×24×5 mm per ISO 15. Quoted values: C 2.28 kN, C0 1.26 kN, mass 7 g. The industry-neutral page spelling 61802-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6802VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6802VV" ], "locale_variants": {} }, { "sku": "61804-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6804ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "ZZ shields are non-contact: 61804-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61804-2RS for that.", "Shielded 61804-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61804-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6804ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 4.4/2.47 kN ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61804-ZZ bearing?", "a": "A 61804-ZZ deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61804-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61804-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6804ZZ — two non-contact steel shields (NSK suffix ZZ), 20×32×7 mm per ISO 15. Quoted values: C 4.4 kN, C0 2.47 kN, mass 17 g. The industry-neutral page spelling 61804-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61804", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6804ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6804ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6804ZZ", "material": "GCr15", "dynamic_load_kN": 4.4, "static_load_kN": 2.47 }, { "sku": "61805-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6805ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "ZZ shields are non-contact: 61805-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61805-2RS for that.", "Shielded 61805-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6805ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 4.95/3.15 kN ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61805-ZZ bearing?", "a": "A 61805-ZZ deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61805-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61805-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6805ZZ — two non-contact steel shields (NSK suffix ZZ), 25×37×7 mm per ISO 15. Quoted values: C 4.95 kN, C0 3.15 kN, mass 21 g. The industry-neutral page spelling 61805-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61805", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6805ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6805ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6805ZZ", "material": "GCr15", "dynamic_load_kN": 4.95, "static_load_kN": 3.15 }, { "sku": "61806-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 24, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6806ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "ZZ shields are non-contact: 61806-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61806-2RS for that.", "Shielded 61806-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6806ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 5.2/3.65 kN ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61806-ZZ bearing?", "a": "A 61806-ZZ deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61806-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61806-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6806ZZ — two non-contact steel shields (NSK suffix ZZ), 30×42×7 mm per ISO 15. Quoted values: C 5.2 kN, C0 3.65 kN, mass 24 g. The industry-neutral page spelling 61806-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61806", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61806-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61806-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61806", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6806ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6806ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6806ZZ", "material": "GCr15", "dynamic_load_kN": 5.2, "static_load_kN": 3.65 }, { "sku": "61807-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 27, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6807ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "ZZ shields are non-contact: 61807-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61807-2RS for that.", "Shielded 61807-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6807ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 5.4/4.1 kN ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61807-ZZ bearing?", "a": "A 61807-ZZ deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61807-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61807-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6807ZZ — two non-contact steel shields (NSK suffix ZZ), 35×47×7 mm per ISO 15. Quoted values: C 5.4 kN, C0 4.1 kN, mass 27 g. The industry-neutral page spelling 61807-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61807", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61807-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61807-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61807", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6807ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6807ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6807ZZ", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 4.1 }, { "sku": "61808-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6808ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "ZZ shields are non-contact: 61808-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61808-2RS for that.", "Shielded 61808-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61808-ZZ.", "NSK catalogues the shielded version as 6808ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7/5.55 kN ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61808-ZZ bearing?", "a": "A 61808-ZZ deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61808-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61808-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6808ZZ — two non-contact steel shields (NSK suffix ZZ), 40×52×7 mm per ISO 15. Quoted values: C 7 kN, C0 5.55 kN, mass 31 g. The industry-neutral page spelling 61808-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61808", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61808-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61808-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61808", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6808ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6808ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6808ZZ", "material": "GCr15", "dynamic_load_kN": 7, "static_load_kN": 5.55 }, { "sku": "61809-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6809ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "ZZ shields are non-contact: 61809-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61809-2RS for that.", "Shielded 61809-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6809ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.25/6.15 kN ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61809-ZZ bearing?", "a": "A 61809-ZZ deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61809-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61809-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6809ZZ — two non-contact steel shields (NSK suffix ZZ), 45×58×7 mm per ISO 15. Quoted values: C 7.25 kN, C0 6.15 kN, mass 38 g. The industry-neutral page spelling 61809-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61809", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6809ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6809ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6809ZZ", "material": "GCr15", "dynamic_load_kN": 7.25, "static_load_kN": 6.15 }, { "sku": "61810-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 50, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6810ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "ZZ shields are non-contact: 61810-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61810-2RS for that.", "Shielded 61810-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61810-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6810ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.05/6.2 kN ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61810-ZZ bearing?", "a": "A 61810-ZZ deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61810-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61810-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6810ZZ — two non-contact steel shields (NSK suffix ZZ), 50×65×7 mm per ISO 15. Quoted values: C 7.05 kN, C0 6.2 kN, mass 50 g. The industry-neutral page spelling 61810-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61810", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6810ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6810ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6810ZZ", "material": "GCr15", "dynamic_load_kN": 7.05, "static_load_kN": 6.2 }, { "sku": "61811-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6811ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "ZZ shields are non-contact: 61811-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61811-2RS for that.", "Shielded 61811-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6811ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 9.7/8.5 kN ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61811-ZZ bearing?", "a": "A 61811-ZZ deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61811-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61811-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6811ZZ — two non-contact steel shields (NSK suffix ZZ), 55×72×9 mm per ISO 15. Quoted values: C 9.7 kN, C0 8.5 kN, mass 81 g. The industry-neutral page spelling 61811-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61811", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6811ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6811ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6811ZZ", "material": "GCr15", "dynamic_load_kN": 9.7, "static_load_kN": 8.5 }, { "sku": "61812-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 103, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6812ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "ZZ shields are non-contact: 61812-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61812-2RS for that.", "Shielded 61812-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6812ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 12.6/10.9 kN ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61812-ZZ bearing?", "a": "A 61812-ZZ deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61812-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61812-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6812ZZ — two non-contact steel shields (NSK suffix ZZ), 60×78×10 mm per ISO 15. Quoted values: C 12.6 kN, C0 10.9 kN, mass 103 g. The industry-neutral page spelling 61812-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61812", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6812ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6812ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6812ZZ", "material": "GCr15", "dynamic_load_kN": 12.6, "static_load_kN": 10.9 }, { "sku": "61813-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 128, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6813ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "ZZ shields are non-contact: 61813-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61813-2RS for that.", "Shielded 61813-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6813ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.1/12.1 kN ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61813-ZZ bearing?", "a": "A 61813-ZZ deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61813-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61813-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6813ZZ — two non-contact steel shields (NSK suffix ZZ), 65×85×10 mm per ISO 15. Quoted values: C 13.1 kN, C0 12.1 kN, mass 128 g. The industry-neutral page spelling 61813-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61813", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6813ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6813ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6813ZZ", "material": "GCr15", "dynamic_load_kN": 13.1, "static_load_kN": 12.1 }, { "sku": "61814-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 134, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6814ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "ZZ shields are non-contact: 61814-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61814-2RS for that.", "Shielded 61814-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61814-ZZ.", "NSK catalogues the shielded version as 6814ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.3/12.7 kN ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61814-ZZ bearing?", "a": "A 61814-ZZ deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61814-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61814-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6814ZZ — two non-contact steel shields (NSK suffix ZZ), 70×90×10 mm per ISO 15. Quoted values: C 13.3 kN, C0 12.7 kN, mass 134 g. The industry-neutral page spelling 61814-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61814", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6814ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6814ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6814ZZ", "material": "GCr15", "dynamic_load_kN": 13.3, "static_load_kN": 12.7 }, { "sku": "61815-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 149, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6815ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "ZZ shields are non-contact: 61815-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61815-2RS for that.", "Shielded 61815-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6815ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.8/13.9 kN ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61815-ZZ bearing?", "a": "A 61815-ZZ deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61815-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61815-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6815ZZ — two non-contact steel shields (NSK suffix ZZ), 75×95×10 mm per ISO 15. Quoted values: C 13.8 kN, C0 13.9 kN, mass 149 g. The industry-neutral page spelling 61815-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61815", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6815ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6815ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6815ZZ", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 13.9 }, { "sku": "61816-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6816VV", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.9, "static_load_kN": 14.5, "weight_g": 151, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "RSR low-friction seals on 61816-RSR run faster than contact-seal 61816-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61816-2RS instead.", "The non-contact lip of 61816-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-RSR.", "NSK catalogues this low-friction non-contact seal as 6816VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 13.9/14.5 kN ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61816-RSR bearing?", "a": "A 61816-RSR deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61816-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61816-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6816VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×100×10 mm per ISO 15. Quoted values: C 13.9 kN, C0 14.5 kN, mass 151 g. The industry-neutral page spelling 61816-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61816", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6816VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6816VV" ], "locale_variants": {} }, { "sku": "61816-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 151, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6816ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "ZZ shields are non-contact: 61816-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61816-2RS for that.", "Shielded 61816-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61816-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6816ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 13.9/14.5 kN ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61816-ZZ bearing?", "a": "A 61816-ZZ deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61816-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61816-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6816ZZ — two non-contact steel shields (NSK suffix ZZ), 80×100×10 mm per ISO 15. Quoted values: C 13.9 kN, C0 14.5 kN, mass 151 g. The industry-neutral page spelling 61816-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61816", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6816ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6816ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6816ZZ", "material": "GCr15", "dynamic_load_kN": 13.9, "static_load_kN": 14.5 }, { "sku": "61817-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 263, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6817ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "ZZ shields are non-contact: 61817-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61817-2RS for that.", "Shielded 61817-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6817ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 20.6/20 kN ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61817-ZZ bearing?", "a": "A 61817-ZZ deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61817-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61817-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6817ZZ — two non-contact steel shields (NSK suffix ZZ), 85×110×13 mm per ISO 15. Quoted values: C 20.6 kN, C0 20 kN, mass 263 g. The industry-neutral page spelling 61817-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61817", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6817ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6817ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6817ZZ", "material": "GCr15", "dynamic_load_kN": 20.6, "static_load_kN": 20 }, { "sku": "61818-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 276, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6818ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "ZZ shields are non-contact: 61818-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61818-2RS for that.", "Shielded 61818-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6818ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 20.9/21 kN ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61818-ZZ bearing?", "a": "A 61818-ZZ deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61818-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61818-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6818ZZ — two non-contact steel shields (NSK suffix ZZ), 90×115×13 mm per ISO 15. Quoted values: C 20.9 kN, C0 21 kN, mass 276 g. The industry-neutral page spelling 61818-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61818", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6818ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6818ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6818ZZ", "material": "GCr15", "dynamic_load_kN": 20.9, "static_load_kN": 21 }, { "sku": "61819-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6819VV", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.2, "static_load_kN": 22, "weight_g": 297, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "RSR low-friction seals on 61819-RSR run faster than contact-seal 61819-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61819-2RS instead.", "The non-contact lip of 61819-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6819VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 21.2/22 kN ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61819-RSR bearing?", "a": "A 61819-RSR deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61819-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61819-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6819VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×120×13 mm per ISO 15. Quoted values: C 21.2 kN, C0 22 kN, mass 297 g. The industry-neutral page spelling 61819-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61819", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6819VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6819VV" ], "locale_variants": {} }, { "sku": "61819-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 297, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6819ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "ZZ shields are non-contact: 61819-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61819-2RS for that.", "Shielded 61819-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6819ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.2/22 kN ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61819-ZZ bearing?", "a": "A 61819-ZZ deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61819-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61819-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6819ZZ — two non-contact steel shields (NSK suffix ZZ), 95×120×13 mm per ISO 15. Quoted values: C 21.2 kN, C0 22 kN, mass 297 g. The industry-neutral page spelling 61819-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61819", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6819ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6819ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6819ZZ", "material": "GCr15", "dynamic_load_kN": 21.2, "static_load_kN": 22 }, { "sku": "61820-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6820ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "ZZ shields are non-contact: 61820-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61820-2RS for that.", "Shielded 61820-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61820-ZZ.", "NSK catalogues the shielded version as 6820ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.5/23 kN ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61820-ZZ bearing?", "a": "A 61820-ZZ deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61820-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61820-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6820ZZ — two non-contact steel shields (NSK suffix ZZ), 100×125×13 mm per ISO 15. Quoted values: C 21.5 kN, C0 23 kN, mass 310 g. The industry-neutral page spelling 61820-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61820", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6820ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6820ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6820ZZ", "material": "GCr15", "dynamic_load_kN": 21.5, "static_load_kN": 23 }, { "sku": "61821-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 324, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6821ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "ZZ shields are non-contact: 61821-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61821-2RS for that.", "Shielded 61821-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6821ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.8/23.9 kN ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61821-ZZ bearing?", "a": "A 61821-ZZ deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61821-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61821-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6821ZZ — two non-contact steel shields (NSK suffix ZZ), 105×130×13 mm per ISO 15. Quoted values: C 21.8 kN, C0 23.9 kN, mass 324 g. The industry-neutral page spelling 61821-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61821", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61821-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61821-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61821", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6821ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6821ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6821ZZ", "material": "GCr15", "dynamic_load_kN": 21.8, "static_load_kN": 23.9 }, { "sku": "61822-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 497, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6822ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "ZZ shields are non-contact: 61822-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61822-2RS for that.", "Shielded 61822-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61822-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6822ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 31/32.5 kN ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61822-ZZ bearing?", "a": "A 61822-ZZ deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61822-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61822-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6822ZZ — two non-contact steel shields (NSK suffix ZZ), 110×140×16 mm per ISO 15. Quoted values: C 31 kN, C0 32.5 kN, mass 497 g. The industry-neutral page spelling 61822-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61822-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61822-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61822", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6822ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6822ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6822ZZ", "material": "GCr15", "dynamic_load_kN": 31, "static_load_kN": 32.5 }, { "sku": "61824-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 537, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6824ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "ZZ shields are non-contact: 61824-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61824-2RS for that.", "Shielded 61824-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6824ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 32/35.5 kN ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61824-ZZ bearing?", "a": "A 61824-ZZ deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61824-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61824-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6824ZZ — two non-contact steel shields (NSK suffix ZZ), 120×150×16 mm per ISO 15. Quoted values: C 32 kN, C0 35.5 kN, mass 537 g. The industry-neutral page spelling 61824-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61824-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61824-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61824", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6824ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6824ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6824ZZ", "material": "GCr15", "dynamic_load_kN": 32, "static_load_kN": 35.5 }, { "sku": "61826-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 758, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6826ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "ZZ shields are non-contact: 61826-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61826-2RS for that.", "Shielded 61826-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 165 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61826-ZZ.", "NSK catalogues the shielded version as 6826ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 40.5/44 kN ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61826-ZZ bearing?", "a": "A 61826-ZZ deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61826-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61826-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6826ZZ — two non-contact steel shields (NSK suffix ZZ), 130×165×18 mm per ISO 15. Quoted values: C 40.5 kN, C0 44 kN, mass 758 g. The industry-neutral page spelling 61826-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61826-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61826-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61826", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6826ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6826ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6826ZZ", "material": "GCr15", "dynamic_load_kN": 40.5, "static_load_kN": 44 }, { "sku": "61828-ZZ", "brand": "NSK", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 832, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6828ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "ZZ shields are non-contact: 61828-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61828-2RS for that.", "Shielded 61828-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61828-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6828ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 42/48 kN ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61828-ZZ bearing?", "a": "A 61828-ZZ deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61828-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61828-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6828ZZ — two non-contact steel shields (NSK suffix ZZ), 140×175×18 mm per ISO 15. Quoted values: C 42 kN, C0 48 kN, mass 832 g. The industry-neutral page spelling 61828-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61828-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61828-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61828", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6828ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6828ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6828ZZ", "material": "GCr15", "dynamic_load_kN": 42, "static_load_kN": 48 }, { "sku": "61830-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6830DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "Contact seals add drag and heat: 61830-2RS runs slower and cooler-limited than the open 61830; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61830-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-2RS.", "NSK catalogues the contact-sealed version as 6830DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-2RS bearing?", "a": "A 61830-2RS deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61830-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6830DDU" ], "locale_variants": {} }, { "sku": "61830-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6830VV", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "RSR low-friction seals on 61830-RSR run faster than contact-seal 61830-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61830-2RS instead.", "The non-contact lip of 61830-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 150 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6830VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-RSR bearing?", "a": "A 61830-RSR deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61830-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830VV — two low-friction non-contact rubber seals (NSK suffix VV), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6830VV" ], "locale_variants": {} }, { "sku": "61830-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6830ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52.5, "static_load_kN": 58.5, "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "ZZ shields are non-contact: 61830-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61830-2RS for that.", "Shielded 61830-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6830ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 52.5/58.5 kN ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61830-ZZ bearing?", "a": "A 61830-ZZ deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61830-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61830-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6830ZZ — two non-contact steel shields (NSK suffix ZZ), 150×190×20 mm per ISO 15. Quoted values: C 52.5 kN, C0 58.5 kN, mass 1150 g. The industry-neutral page spelling 61830-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6830ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6830ZZ" ], "locale_variants": {} }, { "sku": "61832-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6832DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "Contact seals add drag and heat: 61832-2RS runs slower and cooler-limited than the open 61832; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61832-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the contact-sealed version as 6832DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-2RS bearing?", "a": "A 61832-2RS deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61832-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6832DDU" ], "locale_variants": {} }, { "sku": "61832-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6832VV", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "RSR low-friction seals on 61832-RSR run faster than contact-seal 61832-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61832-2RS instead.", "The non-contact lip of 61832-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 160 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6832VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-RSR bearing?", "a": "A 61832-RSR deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61832-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832VV — two low-friction non-contact rubber seals (NSK suffix VV), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6832VV" ], "locale_variants": {} }, { "sku": "61832-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6832ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 61, "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "ZZ shields are non-contact: 61832-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61832-2RS for that.", "Shielded 61832-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61832-ZZ.", "NSK catalogues the shielded version as 6832ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 53/61 kN ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61832-ZZ bearing?", "a": "A 61832-ZZ deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61832-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61832-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6832ZZ — two non-contact steel shields (NSK suffix ZZ), 160×200×20 mm per ISO 15. Quoted values: C 53 kN, C0 61 kN, mass 1230 g. The industry-neutral page spelling 61832-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6832ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6832ZZ" ], "locale_variants": {} }, { "sku": "61834-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6834DDU", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "Contact seals add drag and heat: 61834-2RS runs slower and cooler-limited than the open 61834; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61834-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the contact-sealed version as 6834DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-2RS bearing?", "a": "A 61834-2RS deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61834-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6834DDU" ], "locale_variants": {} }, { "sku": "61834-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6834VV", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "RSR low-friction seals on 61834-RSR run faster than contact-seal 61834-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61834-2RS instead.", "The non-contact lip of 61834-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834-RSR.", "NSK catalogues this low-friction non-contact seal as 6834VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-RSR bearing?", "a": "A 61834-RSR deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61834-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834VV — two low-friction non-contact rubber seals (NSK suffix VV), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6834VV" ], "locale_variants": {} }, { "sku": "61834-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6834ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 75, "weight_g": 1860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "ZZ shields are non-contact: 61834-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61834-2RS for that.", "Shielded 61834-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6834ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 66/75 kN ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61834-ZZ bearing?", "a": "A 61834-ZZ deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61834-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61834-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6834ZZ — two non-contact steel shields (NSK suffix ZZ), 170×215×22 mm per ISO 15. Quoted values: C 66 kN, C0 75 kN, mass 1860 g. The industry-neutral page spelling 61834-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6834ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6834ZZ" ], "locale_variants": {} }, { "sku": "61836-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6836VV", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.5, "static_load_kN": 78.5, "weight_g": 1980, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "RSR low-friction seals on 61836-RSR run faster than contact-seal 61836-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61836-2RS instead.", "The non-contact lip of 61836-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 180 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61836-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6836VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 66.5/78.5 kN ratings, mass 1980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6836VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61836-RSR bearing?", "a": "A 61836-RSR deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61836-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61836-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6836VV — two low-friction non-contact rubber seals (NSK suffix VV), 180×225×22 mm per ISO 15. Quoted values: C 66.5 kN, C0 78.5 kN, mass 1980 g. The industry-neutral page spelling 61836-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61836", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6836VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6836VV" ], "locale_variants": {} }, { "sku": "61838-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6838VV", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80.5, "static_load_kN": 93.5, "weight_g": 2530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "RSR low-friction seals on 61838-RSR run faster than contact-seal 61838-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61838-2RS instead.", "The non-contact lip of 61838-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 190 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6838VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 80.5/93.5 kN ratings, mass 2530 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6838VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61838-RSR bearing?", "a": "A 61838-RSR deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61838 bore code work?", "a": "The last two digits of 61838 are bore code 38, giving 38 × 5 = 190 mm bore. The 240 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61838-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61838-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6838VV — two low-friction non-contact rubber seals (NSK suffix VV), 190×240×24 mm per ISO 15. Quoted values: C 80.5 kN, C0 93.5 kN, mass 2530 g. The industry-neutral page spelling 61838-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61838", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6838VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6838VV" ], "locale_variants": {} }, { "sku": "61844-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6844ZZ", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 84, "static_load_kN": 107, "weight_g": 2900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "ZZ shields are non-contact: 61844-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61844-2RS for that.", "Shielded 61844-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 270 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61844-ZZ.", "NSK catalogues the shielded version as 6844ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 84/107 kN ratings, mass 2900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6844ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61844-ZZ bearing?", "a": "A 61844-ZZ deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61844-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 220 mm bore?", "a": "618 is an extra-thin section: 270×24 mm, only 25.0 mm radial section at 220 mm bore, far smaller than a 6244, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NSK designation and catalogue data for 61844-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6844ZZ — two non-contact steel shields (NSK suffix ZZ), 220×270×24 mm per ISO 15. Quoted values: C 84 kN, C0 107 kN, mass 2900 g. The industry-neutral page spelling 61844-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61844", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6844ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6844ZZ" ], "locale_variants": {} }, { "sku": "61900-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6900VV", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.97, "static_load_kN": 1.27, "weight_g": 9, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61900-RSR run faster than contact-seal 61900-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61900-2RS instead.", "The non-contact lip of 61900-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6900VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 2.97/1.27 kN ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61900-RSR bearing?", "a": "A 61900-RSR deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61900-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61900-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6900VV — two low-friction non-contact rubber seals (NSK suffix VV), 10×22×6 mm per ISO 15. Quoted values: C 2.97 kN, C0 1.27 kN, mass 9 g. The industry-neutral page spelling 61900-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6900VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6900VV" ], "locale_variants": {} }, { "sku": "61901-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6901VV", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.2, "static_load_kN": 1.46, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61901-RSR run faster than contact-seal 61901-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61901-2RS instead.", "The non-contact lip of 61901-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6901VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 3.2/1.46 kN ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61901-RSR bearing?", "a": "A 61901-RSR deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61901-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61901-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6901VV — two low-friction non-contact rubber seals (NSK suffix VV), 12×24×6 mm per ISO 15. Quoted values: C 3.2 kN, C0 1.46 kN, mass 10 g. The industry-neutral page spelling 61901-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6901VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6901VV" ], "locale_variants": {} }, { "sku": "61904-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6904ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61904-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61904-2RS for that.", "Shielded 61904-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6904ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7/3.7 kN ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61904-ZZ bearing?", "a": "A 61904-ZZ deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61904-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61904-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6904ZZ — two non-contact steel shields (NSK suffix ZZ), 20×37×9 mm per ISO 15. Quoted values: C 7 kN, C0 3.7 kN, mass 37 g. The industry-neutral page spelling 61904-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61904", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6904ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6904ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6904ZZ", "material": "GCr15", "dynamic_load_kN": 7, "static_load_kN": 3.7 }, { "sku": "61905-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 42, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6905ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61905-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61905-2RS for that.", "Shielded 61905-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6905ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.75/4.55 kN ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61905-ZZ bearing?", "a": "A 61905-ZZ deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61905-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61905-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6905ZZ — two non-contact steel shields (NSK suffix ZZ), 25×42×9 mm per ISO 15. Quoted values: C 7.75 kN, C0 4.55 kN, mass 42 g. The industry-neutral page spelling 61905-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61905", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61905-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61905", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6905ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6905ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6905ZZ", "material": "GCr15", "dynamic_load_kN": 7.75, "static_load_kN": 4.55 }, { "sku": "61906-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6906ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61906-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61906-2RS for that.", "Shielded 61906-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6906ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 7.95/5 kN ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61906-ZZ bearing?", "a": "A 61906-ZZ deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61906-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61906-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6906ZZ — two non-contact steel shields (NSK suffix ZZ), 30×47×9 mm per ISO 15. Quoted values: C 7.95 kN, C0 5 kN, mass 52 g. The industry-neutral page spelling 61906-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61906", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6906ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6906ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6906ZZ", "material": "GCr15", "dynamic_load_kN": 7.95, "static_load_kN": 5 }, { "sku": "61907-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 75, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6907ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61907-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61907-2RS for that.", "Shielded 61907-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61907-ZZ.", "NSK catalogues the shielded version as 6907ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 11.6/7.25 kN ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61907-ZZ bearing?", "a": "A 61907-ZZ deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61907-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61907-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6907ZZ — two non-contact steel shields (NSK suffix ZZ), 35×55×10 mm per ISO 15. Quoted values: C 11.6 kN, C0 7.25 kN, mass 75 g. The industry-neutral page spelling 61907-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61907", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61907-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61907", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6907ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6907ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6907ZZ", "material": "GCr15", "dynamic_load_kN": 11.6, "static_load_kN": 7.25 }, { "sku": "61908-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 112, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6908ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61908-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61908-2RS for that.", "Shielded 61908-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6908ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 15/10 kN ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61908-ZZ bearing?", "a": "A 61908-ZZ deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61908-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61908-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6908ZZ — two non-contact steel shields (NSK suffix ZZ), 40×62×12 mm per ISO 15. Quoted values: C 15 kN, C0 10 kN, mass 112 g. The industry-neutral page spelling 61908-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61908", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61908-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61908", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6908ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6908ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6908ZZ", "material": "GCr15", "dynamic_load_kN": 15, "static_load_kN": 10 }, { "sku": "61909-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 126, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6909ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61909-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61909-2RS for that.", "Shielded 61909-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61909-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6909ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 15.5/10.9 kN ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61909-ZZ bearing?", "a": "A 61909-ZZ deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61909-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61909-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6909ZZ — two non-contact steel shields (NSK suffix ZZ), 45×68×12 mm per ISO 15. Quoted values: C 15.5 kN, C0 10.9 kN, mass 126 g. The industry-neutral page spelling 61909-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61909", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6909ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6909ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6909ZZ", "material": "GCr15", "dynamic_load_kN": 15.5, "static_load_kN": 10.9 }, { "sku": "61910-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 135, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6910ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61910-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61910-2RS for that.", "Shielded 61910-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6910ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 16/11.7 kN ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61910-ZZ bearing?", "a": "A 61910-ZZ deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61910-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61910-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6910ZZ — two non-contact steel shields (NSK suffix ZZ), 50×72×12 mm per ISO 15. Quoted values: C 16 kN, C0 11.7 kN, mass 135 g. The industry-neutral page spelling 61910-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61910", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6910ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6910ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6910ZZ", "material": "GCr15", "dynamic_load_kN": 16, "static_load_kN": 11.7 }, { "sku": "61911-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 189, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6911ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61911-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61911-2RS for that.", "Shielded 61911-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6911ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 17.6/13.3 kN ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61911-ZZ bearing?", "a": "A 61911-ZZ deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61911-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61911-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6911ZZ — two non-contact steel shields (NSK suffix ZZ), 55×80×13 mm per ISO 15. Quoted values: C 17.6 kN, C0 13.3 kN, mass 189 g. The industry-neutral page spelling 61911-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61911", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6911ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6911ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6911ZZ", "material": "GCr15", "dynamic_load_kN": 17.6, "static_load_kN": 13.3 }, { "sku": "61912-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 192, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6912ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61912-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61912-2RS for that.", "Shielded 61912-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6912ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 21.4/16.3 kN ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61912-ZZ bearing?", "a": "A 61912-ZZ deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61912-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61912-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6912ZZ — two non-contact steel shields (NSK suffix ZZ), 60×85×13 mm per ISO 15. Quoted values: C 21.4 kN, C0 16.3 kN, mass 192 g. The industry-neutral page spelling 61912-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61912", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6912ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6912ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6912ZZ", "material": "GCr15", "dynamic_load_kN": 21.4, "static_load_kN": 16.3 }, { "sku": "61913-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 218, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6913ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61913-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61913-2RS for that.", "Shielded 61913-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61913-ZZ.", "NSK catalogues the shielded version as 6913ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 19.1/16.1 kN ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61913-ZZ bearing?", "a": "A 61913-ZZ deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61913-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61913-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6913ZZ — two non-contact steel shields (NSK suffix ZZ), 65×90×13 mm per ISO 15. Quoted values: C 19.1 kN, C0 16.1 kN, mass 218 g. The industry-neutral page spelling 61913-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61913", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6913ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6913ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6913ZZ", "material": "GCr15", "dynamic_load_kN": 19.1, "static_load_kN": 16.1 }, { "sku": "61914-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 349, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6914ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61914-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61914-2RS for that.", "Shielded 61914-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6914ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 26.1/21.2 kN ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61914-ZZ bearing?", "a": "A 61914-ZZ deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61914-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61914-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6914ZZ — two non-contact steel shields (NSK suffix ZZ), 70×100×16 mm per ISO 15. Quoted values: C 26.1 kN, C0 21.2 kN, mass 349 g. The industry-neutral page spelling 61914-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61914", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6914ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6914ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6914ZZ", "material": "GCr15", "dynamic_load_kN": 26.1, "static_load_kN": 21.2 }, { "sku": "61915-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 364, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6915ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61915-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61915-2RS for that.", "Shielded 61915-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61915-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6915ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 26.8/22.6 kN ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61915-ZZ bearing?", "a": "A 61915-ZZ deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61915-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61915-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6915ZZ — two non-contact steel shields (NSK suffix ZZ), 75×105×16 mm per ISO 15. Quoted values: C 26.8 kN, C0 22.6 kN, mass 364 g. The industry-neutral page spelling 61915-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61915", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6915ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6915ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6915ZZ", "material": "GCr15", "dynamic_load_kN": 26.8, "static_load_kN": 22.6 }, { "sku": "61916-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 391, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6916ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61916-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61916-2RS for that.", "Shielded 61916-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6916ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 27.4/24 kN ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61916-ZZ bearing?", "a": "A 61916-ZZ deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61916-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61916-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6916ZZ — two non-contact steel shields (NSK suffix ZZ), 80×110×16 mm per ISO 15. Quoted values: C 27.4 kN, C0 24 kN, mass 391 g. The industry-neutral page spelling 61916-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "61916", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6916ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6916ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6916ZZ", "material": "GCr15", "dynamic_load_kN": 27.4, "static_load_kN": 24 }, { "sku": "61917-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6917DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61917-2RS runs slower and cooler-limited than the open 61917; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61917-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61917-2RS.", "NSK catalogues the contact-sealed version as 6917DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-2RS bearing?", "a": "A 61917-2RS deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61917-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6917DDU", "material": "GCr15", "dynamic_load_kN": 35, "static_load_kN": 29.6 }, { "sku": "61917-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6917VV", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35, "static_load_kN": 29.6, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61917-RSR run faster than contact-seal 61917-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61917-2RS instead.", "The non-contact lip of 61917-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6917VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-RSR bearing?", "a": "A 61917-RSR deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61917-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917VV" ], "locale_variants": {} }, { "sku": "61917-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6917ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61917-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61917-2RS for that.", "Shielded 61917-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6917ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 35/29.6 kN ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61917-ZZ bearing?", "a": "A 61917-ZZ deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61917-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61917-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6917ZZ — two non-contact steel shields (NSK suffix ZZ), 85×120×18 mm per ISO 15. Quoted values: C 35 kN, C0 29.6 kN, mass 550 g. The industry-neutral page spelling 61917-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61917", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6917ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6917ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6917ZZ", "material": "GCr15", "dynamic_load_kN": 35, "static_load_kN": 29.6 }, { "sku": "61918-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6918DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61918-2RS runs slower and cooler-limited than the open 61918; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61918-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6918DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-2RS bearing?", "a": "A 61918-2RS deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61918-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6918DDU", "material": "GCr15", "dynamic_load_kN": 36, "static_load_kN": 31.5 }, { "sku": "61918-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6918VV", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 36, "static_load_kN": 31.5, "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61918-RSR run faster than contact-seal 61918-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61918-2RS instead.", "The non-contact lip of 61918-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6918VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-RSR bearing?", "a": "A 61918-RSR deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61918-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918VV" ], "locale_variants": {} }, { "sku": "61918-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 585, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6918ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61918-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61918-2RS for that.", "Shielded 61918-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6918ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 36/31.5 kN ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61918-ZZ bearing?", "a": "A 61918-ZZ deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61918-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61918-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6918ZZ — two non-contact steel shields (NSK suffix ZZ), 90×125×18 mm per ISO 15. Quoted values: C 36 kN, C0 31.5 kN, mass 585 g. The industry-neutral page spelling 61918-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61918", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6918ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6918ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6918ZZ", "material": "GCr15", "dynamic_load_kN": 36, "static_load_kN": 31.5 }, { "sku": "61919-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6919VV", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 33.5, "weight_g": 601, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61919-RSR run faster than contact-seal 61919-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61919-2RS instead.", "The non-contact lip of 61919-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6919VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 37/33.5 kN ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61919-RSR bearing?", "a": "A 61919-RSR deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61919-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61919-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6919VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×130×18 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, mass 601 g. The industry-neutral page spelling 61919-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61919", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6919VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6919VV" ], "locale_variants": {} }, { "sku": "61919-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 601, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6919ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61919-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61919-2RS for that.", "Shielded 61919-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61919-ZZ.", "NSK catalogues the shielded version as 6919ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 37/33.5 kN ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61919-ZZ bearing?", "a": "A 61919-ZZ deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61919-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61919-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6919ZZ — two non-contact steel shields (NSK suffix ZZ), 95×130×18 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, mass 601 g. The industry-neutral page spelling 61919-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "61919", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6919ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6919ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6919ZZ", "material": "GCr15", "dynamic_load_kN": 37, "static_load_kN": 33.5 }, { "sku": "61920-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6920DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61920-2RS runs slower and cooler-limited than the open 61920; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61920-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the contact-sealed version as 6920DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-2RS bearing?", "a": "A 61920-2RS deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61920-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6920DDU", "material": "GCr15", "dynamic_load_kN": 47, "static_load_kN": 42 }, { "sku": "61920-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6920VV", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 47, "static_load_kN": 42, "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61920-RSR run faster than contact-seal 61920-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61920-2RS instead.", "The non-contact lip of 61920-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6920VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-RSR bearing?", "a": "A 61920-RSR deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61920-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920VV" ], "locale_variants": {} }, { "sku": "61920-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 828, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6920ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61920-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61920-2RS for that.", "Shielded 61920-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6920ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 47/42 kN ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61920-ZZ bearing?", "a": "A 61920-ZZ deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61920-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61920-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6920ZZ — two non-contact steel shields (NSK suffix ZZ), 100×140×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, mass 828 g. The industry-neutral page spelling 61920-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61920", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6920ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6920ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6920ZZ", "material": "GCr15", "dynamic_load_kN": 47, "static_load_kN": 42 }, { "sku": "61921-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6921VV", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 46.5, "static_load_kN": 42, "weight_g": 856, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61921-RSR run faster than contact-seal 61921-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61921-2RS instead.", "The non-contact lip of 61921-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 145 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61921-RSR.", "NSK catalogues this low-friction non-contact seal as 6921VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 46.5/42 kN ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-RSR bearing?", "a": "A 61921-RSR deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61921-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61921-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6921VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×145×20 mm per ISO 15. Quoted values: C 46.5 kN, C0 42 kN, mass 856 g. The industry-neutral page spelling 61921-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6921VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6921VV" ], "locale_variants": {} }, { "sku": "61921-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 856, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6921ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61921-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61921-2RS for that.", "Shielded 61921-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61921-ZZ-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6921ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 46.5/42 kN ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-ZZ bearing?", "a": "A 61921-ZZ deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61921-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61921-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6921ZZ — two non-contact steel shields (NSK suffix ZZ), 105×145×20 mm per ISO 15. Quoted values: C 46.5 kN, C0 42 kN, mass 856 g. The industry-neutral page spelling 61921-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6921ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6921ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6921ZZ", "material": "GCr15", "dynamic_load_kN": 46.5, "static_load_kN": 42 }, { "sku": "61922-2RS", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6922DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61922-2RS runs slower and cooler-limited than the open 61922; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61922-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the contact-sealed version as 6922DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-2RS bearing?", "a": "A 61922-2RS deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61922-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922DDU" ], "locale_variants": {}, "manufacturer_designation": "NSK 6922DDU", "material": "GCr15", "dynamic_load_kN": 48, "static_load_kN": 44.5 }, { "sku": "61922-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6922VV", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 44.5, "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61922-RSR run faster than contact-seal 61922-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61922-2RS instead.", "The non-contact lip of 61922-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6922VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-RSR bearing?", "a": "A 61922-RSR deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61922-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922VV" ], "locale_variants": {} }, { "sku": "61922-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 893, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6922ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61922-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61922-2RS for that.", "Shielded 61922-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6922ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 48/44.5 kN ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61922-ZZ bearing?", "a": "A 61922-ZZ deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61922-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61922-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6922ZZ — two non-contact steel shields (NSK suffix ZZ), 110×150×20 mm per ISO 15. Quoted values: C 48 kN, C0 44.5 kN, mass 893 g. The industry-neutral page spelling 61922-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61922", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6922ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6922ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6922ZZ", "material": "GCr15", "dynamic_load_kN": 48, "static_load_kN": 44.5 }, { "sku": "61924-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6924ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61924-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61924-2RS for that.", "Shielded 61924-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6924ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 58.5/54 kN ratings, mass 1210 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6924ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61924-ZZ bearing?", "a": "A 61924-ZZ deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61924-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61924-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6924ZZ — two non-contact steel shields (NSK suffix ZZ), 120×165×22 mm per ISO 15. Quoted values: C 58.5 kN, C0 54 kN, mass 1210 g. The industry-neutral page spelling 61924-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61924", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6924ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6924ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6924ZZ", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 54 }, { "sku": "61926-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1570, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6926ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61926-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61926-2RS for that.", "Shielded 61926-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6926ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 71.5/67.5 kN ratings, mass 1570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6926ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61926-ZZ bearing?", "a": "A 61926-ZZ deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61926-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61926-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6926ZZ — two non-contact steel shields (NSK suffix ZZ), 130×180×24 mm per ISO 15. Quoted values: C 71.5 kN, C0 67.5 kN, mass 1570 g. The industry-neutral page spelling 61926-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61926", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6926ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6926ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6926ZZ", "material": "GCr15", "dynamic_load_kN": 71.5, "static_load_kN": 67.5 }, { "sku": "61928-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6928VV", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 73.5, "static_load_kN": 72, "weight_g": 1670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61928-RSR run faster than contact-seal 61928-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61928-2RS instead.", "The non-contact lip of 61928-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6928VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 73.5/72 kN ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-RSR bearing?", "a": "A 61928-RSR deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61928-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61928-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6928VV — two low-friction non-contact rubber seals (NSK suffix VV), 140×190×24 mm per ISO 15. Quoted values: C 73.5 kN, C0 72 kN, mass 1670 g. The industry-neutral page spelling 61928-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6928VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6928VV" ], "locale_variants": {} }, { "sku": "61928-ZZ", "brand": "NSK", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6928ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61928-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61928-2RS for that.", "Shielded 61928-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6928ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 73.5/72 kN ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-ZZ bearing?", "a": "A 61928-ZZ deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61928-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61928-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6928ZZ — two non-contact steel shields (NSK suffix ZZ), 140×190×24 mm per ISO 15. Quoted values: C 73.5 kN, C0 72 kN, mass 1670 g. The industry-neutral page spelling 61928-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6928ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6928ZZ" ], "locale_variants": {}, "manufacturer_designation": "NSK 6928ZZ", "material": "GCr15", "dynamic_load_kN": 73.5, "static_load_kN": 72 }, { "sku": "61930-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6930DDU", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61930-2RS runs slower and cooler-limited than the open 61930; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61930-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6930DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930-2RS bearing?", "a": "A 61930-2RS deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61930-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6930DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930DDU" ], "locale_variants": {} }, { "sku": "61930-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6930ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61930-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61930-2RS for that.", "Shielded 61930-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6930ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930-ZZ bearing?", "a": "A 61930-ZZ deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61930-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930ZZ — two non-contact steel shields (NSK suffix ZZ), 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6930ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930ZZ" ], "locale_variants": {} }, { "sku": "61930", "brand": "NSK", "manufacturer_designation": "NSK 6930", "series": "61900-series", "type": "deep_groove", "d_mm": 150, "D_mm": 210, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 93.5, "static_load_kN": 90.5, "weight_g": 3010, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61930 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×210×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61930 units.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61930 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 93.5/90.5 kN ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61930 bearing?", "a": "A 61930 deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61930 bore code work?", "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61930 mean?", "a": "A bare 61930 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 150 mm bore?", "a": "619 is a thin section one step above 618: 210×28 mm with a 30.0 mm radial section at 150 mm bore; a 6230 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61930?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6930 — the open (unsealed) execution, 150×210×28 mm per ISO 15. Quoted values: C 93.5 kN, C0 90.5 kN, mass 3010 g. The industry-neutral page spelling 61930 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61930", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6930" ], "locale_variants": {} }, { "sku": "61932-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6932DDU", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95.5, "static_load_kN": 96, "weight_g": 2710, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61932-2RS runs slower and cooler-limited than the open 61932; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61932-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the contact-sealed version as 6932DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 95.5/96 kN ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61932-2RS bearing?", "a": "A 61932-2RS deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61932-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61932-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6932DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 160×220×28 mm per ISO 15. Quoted values: C 95.5 kN, C0 96 kN, mass 2710 g. The industry-neutral page spelling 61932-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6932DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6932DDU" ], "locale_variants": {} }, { "sku": "61932-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6932ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95.5, "static_load_kN": 96, "weight_g": 2710, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61932-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61932-2RS for that.", "Shielded 61932-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6932ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 95.5/96 kN ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61932-ZZ bearing?", "a": "A 61932-ZZ deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61932-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61932-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6932ZZ — two non-contact steel shields (NSK suffix ZZ), 160×220×28 mm per ISO 15. Quoted values: C 95.5 kN, C0 96 kN, mass 2710 g. The industry-neutral page spelling 61932-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6932ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6932ZZ" ], "locale_variants": {} }, { "sku": "61934-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6934ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 94.5, "static_load_kN": 97, "weight_g": 3340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61934-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61934-2RS for that.", "Shielded 61934-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6934ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 94.5/97 kN ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61934-ZZ bearing?", "a": "A 61934-ZZ deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61934 bore code work?", "a": "The last two digits of 61934 are bore code 34, giving 34 × 5 = 170 mm bore. The 230 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61934-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61934-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6934ZZ — two non-contact steel shields (NSK suffix ZZ), 170×230×28 mm per ISO 15. Quoted values: C 94.5 kN, C0 97 kN, mass 3340 g. The industry-neutral page spelling 61934-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61934", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6934ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6934ZZ" ], "locale_variants": {} }, { "sku": "61934", "brand": "NSK", "manufacturer_designation": "NSK 6934", "series": "61900-series", "type": "deep_groove", "d_mm": 170, "D_mm": 230, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 94.5, "static_load_kN": 97, "weight_g": 3340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61934 carries bore code 34 = 170 mm. Outside diameter 230 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61934 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×230×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61934 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61934 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 94.5/97 kN ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61934 bearing?", "a": "A 61934 deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61934 bore code work?", "a": "The last two digits of 61934 are bore code 34, giving 34 × 5 = 170 mm bore. The 230 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61934 mean?", "a": "A bare 61934 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 170 mm bore?", "a": "619 is a thin section one step above 618: 230×28 mm with a 30.0 mm radial section at 170 mm bore; a 6234 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61934?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6934 — the open (unsealed) execution, 170×230×28 mm per ISO 15. Quoted values: C 94.5 kN, C0 97 kN, mass 3340 g. The industry-neutral page spelling 61934 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61934", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6934" ], "locale_variants": {} }, { "sku": "61936-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6936ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 128, "weight_g": 4160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61936 carries bore code 36 = 180 mm. Outside diameter 250 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61936-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61936-2RS for that.", "Shielded 61936-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6936ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 131/128 kN ratings, mass 4160 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6936ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61936-ZZ bearing?", "a": "A 61936-ZZ deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61936 bore code work?", "a": "The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61936-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61936-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6936ZZ — two non-contact steel shields (NSK suffix ZZ), 180×250×33 mm per ISO 15. Quoted values: C 131 kN, C0 128 kN, mass 4160 g. The industry-neutral page spelling 61936-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61936", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6936ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6936ZZ" ], "locale_variants": {} }, { "sku": "61940-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6940ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 158, "static_load_kN": 158, "weight_g": 7280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61940-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61940-2RS for that.", "Shielded 61940-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6940ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 158/158 kN ratings, mass 7280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6940ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61940-ZZ bearing?", "a": "A 61940-ZZ deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61940 bore code work?", "a": "The last two digits of 61940 are bore code 40, giving 40 × 5 = 200 mm bore. The 280 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61940-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61940-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6940ZZ — two non-contact steel shields (NSK suffix ZZ), 200×280×38 mm per ISO 15. Quoted values: C 158 kN, C0 158 kN, mass 7280 g. The industry-neutral page spelling 61940-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61940", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6940ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6940ZZ" ], "locale_variants": {} }, { "sku": "61944-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6944ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 161, "static_load_kN": 169, "weight_g": 7880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61944-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61944-2RS for that.", "Shielded 61944-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6944ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 161/169 kN ratings, mass 7880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6944ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61944-ZZ bearing?", "a": "A 61944-ZZ deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61944-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 220 mm bore?", "a": "619 is a thin section one step above 618: 300×38 mm with a 40.0 mm radial section at 220 mm bore; a 6244 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61944-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6944ZZ — two non-contact steel shields (NSK suffix ZZ), 220×300×38 mm per ISO 15. Quoted values: C 161 kN, C0 169 kN, mass 7880 g. The industry-neutral page spelling 61944-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61944", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6944ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6944ZZ" ], "locale_variants": {} }, { "sku": "61948-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6948ZZ", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 170, "static_load_kN": 190, "weight_g": 8490, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61948-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61948-2RS for that.", "Shielded 61948-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6948ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 170/190 kN ratings, mass 8490 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6948ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61948-ZZ bearing?", "a": "A 61948-ZZ deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61948-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 240 mm bore?", "a": "619 is a thin section one step above 618: 320×38 mm with a 40.0 mm radial section at 240 mm bore; a 6248 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NSK designation and catalogue data for 61948-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6948ZZ — two non-contact steel shields (NSK suffix ZZ), 240×320×38 mm per ISO 15. Quoted values: C 170 kN, C0 190 kN, mass 8490 g. The industry-neutral page spelling 61948-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "61948", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix 6948ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6948ZZ" ], "locale_variants": {} }, { "sku": "6207-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6207VV", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.2, "static_load_kN": 15.3, "weight_g": 284, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6207-RSR run faster than contact-seal 6207-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6207-2RS instead.", "The non-contact lip of 6207-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6207-RSR.", "NSK catalogues this low-friction non-contact seal as 6207VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 28.2/15.3 kN ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6207-RSR bearing?", "a": "A 6207-RSR deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6207-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6207-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6207VV — two low-friction non-contact rubber seals (NSK suffix VV), 35×72×17 mm per ISO 15. Quoted values: C 28.2 kN, C0 15.3 kN, mass 284 g. The industry-neutral page spelling 6207-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207VV" ], "locale_variants": {} }, { "sku": "6209-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6209VV", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 20.4, "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6209-RSR run faster than contact-seal 6209-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6209-2RS instead.", "The non-contact lip of 6209-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6209VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 34.5/20.4 kN ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6209-RSR bearing?", "a": "A 6209-RSR deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6209-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6209-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6209VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×85×19 mm per ISO 15. Quoted values: C 34.5 kN, C0 20.4 kN, mass 420 g. The industry-neutral page spelling 6209-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209VV" ], "locale_variants": {} }, { "sku": "6210-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6210VV", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38.5, "static_load_kN": 23.2, "weight_g": 459, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6210-RSR run faster than contact-seal 6210-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6210-2RS instead.", "The non-contact lip of 6210-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6210VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 38.5/23.2 kN ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6210-RSR bearing?", "a": "A 6210-RSR deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6210-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6210-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6210VV — two low-friction non-contact rubber seals (NSK suffix VV), 50×90×20 mm per ISO 15. Quoted values: C 38.5 kN, C0 23.2 kN, mass 459 g. The industry-neutral page spelling 6210-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210VV" ], "locale_variants": {} }, { "sku": "6211-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6211VV", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 47.5, "static_load_kN": 29.3, "weight_g": 619, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6211-RSR run faster than contact-seal 6211-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6211-2RS instead.", "The non-contact lip of 6211-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6211VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 47.5/29.3 kN ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6211-RSR bearing?", "a": "A 6211-RSR deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6211-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6211-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6211VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×100×21 mm per ISO 15. Quoted values: C 47.5 kN, C0 29.3 kN, mass 619 g. The industry-neutral page spelling 6211-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211VV" ], "locale_variants": {} }, { "sku": "6212-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6212VV", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 36, "weight_g": 783, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6212-RSR run faster than contact-seal 6212-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6212-2RS instead.", "The non-contact lip of 6212-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6212VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 57.5/36 kN ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6212-RSR bearing?", "a": "A 6212-RSR deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6212-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6212-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6212VV — two low-friction non-contact rubber seals (NSK suffix VV), 60×110×22 mm per ISO 15. Quoted values: C 57.5 kN, C0 36 kN, mass 783 g. The industry-neutral page spelling 6212-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212VV" ], "locale_variants": {} }, { "sku": "6213-2RS", "brand": "NSK", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6213DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6213-2RS runs slower and cooler-limited than the open 6213; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6213-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the contact-sealed version as 6213DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 63/40 kN ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6213-2RS bearing?", "a": "A 6213-2RS deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6213-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6213-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6213DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 65×120×23 mm per ISO 15. Quoted values: C 63 kN, C0 40 kN, mass 1000 g. The industry-neutral page spelling 6213-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6213", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6213DDU", "material": "GCr15", "dynamic_load_kN": 63, "static_load_kN": 40 }, { "sku": "6213-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6213VV", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 40, "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6213-RSR run faster than contact-seal 6213-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6213-2RS instead.", "The non-contact lip of 6213-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6213-RSR.", "NSK catalogues this low-friction non-contact seal as 6213VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 63/40 kN ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6213-RSR bearing?", "a": "A 6213-RSR deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6213-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6213-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6213VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×120×23 mm per ISO 15. Quoted values: C 63 kN, C0 40 kN, mass 1000 g. The industry-neutral page spelling 6213-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6213", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213VV" ], "locale_variants": {} }, { "sku": "6214-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6214VV", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68.5, "static_load_kN": 44, "weight_g": 1090, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6214-RSR run faster than contact-seal 6214-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6214-2RS instead.", "The non-contact lip of 6214-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6214VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 68.5/44 kN ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6214-RSR bearing?", "a": "A 6214-RSR deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6214-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6214-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6214VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×125×24 mm per ISO 15. Quoted values: C 68.5 kN, C0 44 kN, mass 1090 g. The industry-neutral page spelling 6214-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214VV" ], "locale_variants": {} }, { "sku": "6215-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6215VV", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 73, "static_load_kN": 49.5, "weight_g": 1190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6215-RSR run faster than contact-seal 6215-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6215-2RS instead.", "The non-contact lip of 6215-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6215VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 73/49.5 kN ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6215-RSR bearing?", "a": "A 6215-RSR deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6215-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6215-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6215VV — two low-friction non-contact rubber seals (NSK suffix VV), 75×130×25 mm per ISO 15. Quoted values: C 73 kN, C0 49.5 kN, mass 1190 g. The industry-neutral page spelling 6215-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215VV" ], "locale_variants": {} }, { "sku": "6216-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6216VV", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 53, "weight_g": 1420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6216-RSR run faster than contact-seal 6216-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6216-2RS instead.", "The non-contact lip of 6216-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6216VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 80/53 kN ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6216-RSR bearing?", "a": "A 6216-RSR deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6216-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6216-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6216VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×140×26 mm per ISO 15. Quoted values: C 80 kN, C0 53 kN, mass 1420 g. The industry-neutral page spelling 6216-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216VV" ], "locale_variants": {} }, { "sku": "6217-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6217VV", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 92.5, "static_load_kN": 62, "weight_g": 1760, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6217-RSR run faster than contact-seal 6217-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6217-2RS instead.", "The non-contact lip of 6217-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6217VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 92.5/62 kN ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6217-RSR bearing?", "a": "A 6217-RSR deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6217-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6217-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6217VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×150×28 mm per ISO 15. Quoted values: C 92.5 kN, C0 62 kN, mass 1760 g. The industry-neutral page spelling 6217-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217VV" ], "locale_variants": {} }, { "sku": "6218-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6218VV", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 71.5, "weight_g": 2180, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6218-RSR run faster than contact-seal 6218-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6218-2RS instead.", "The non-contact lip of 6218-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6218VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 106/71.5 kN ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6218-RSR bearing?", "a": "A 6218-RSR deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6218-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6218-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6218VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×160×30 mm per ISO 15. Quoted values: C 106 kN, C0 71.5 kN, mass 2180 g. The industry-neutral page spelling 6218-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218VV" ], "locale_variants": {} }, { "sku": "6219-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6219VV", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 120, "static_load_kN": 82, "weight_g": 2640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6219-RSR run faster than contact-seal 6219-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6219-2RS instead.", "The non-contact lip of 6219-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219-RSR.", "NSK catalogues this low-friction non-contact seal as 6219VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 120/82 kN ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6219-RSR bearing?", "a": "A 6219-RSR deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6219-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6219-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6219VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×170×32 mm per ISO 15. Quoted values: C 120 kN, C0 82 kN, mass 2640 g. The industry-neutral page spelling 6219-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219VV" ], "locale_variants": {} }, { "sku": "6220-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6220VV", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 93, "weight_g": 3170, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6220-RSR run faster than contact-seal 6220-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6220-2RS instead.", "The non-contact lip of 6220-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6220VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 134/93 kN ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6220-RSR bearing?", "a": "A 6220-RSR deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6220-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6220-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6220VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×180×34 mm per ISO 15. Quoted values: C 134 kN, C0 93 kN, mass 3170 g. The industry-neutral page spelling 6220-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220VV" ], "locale_variants": {} }, { "sku": "6221-2RS", "brand": "NSK", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6221DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6221-2RS runs slower and cooler-limited than the open 6221; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6221-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-2RS.", "NSK catalogues the contact-sealed version as 6221DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 146/105 kN ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6221-2RS bearing?", "a": "A 6221-2RS deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6221-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6221-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6221DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 105×190×36 mm per ISO 15. Quoted values: C 146 kN, C0 105 kN, mass 3790 g. The industry-neutral page spelling 6221-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6221", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6221DDU", "material": "GCr15", "dynamic_load_kN": 146, "static_load_kN": 105 }, { "sku": "6221-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6221VV", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 105, "weight_g": 3790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6221-RSR run faster than contact-seal 6221-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6221-2RS instead.", "The non-contact lip of 6221-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6221VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 146/105 kN ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6221-RSR bearing?", "a": "A 6221-RSR deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6221-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6221-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6221VV — two low-friction non-contact rubber seals (NSK suffix VV), 105×190×36 mm per ISO 15. Quoted values: C 146 kN, C0 105 kN, mass 3790 g. The industry-neutral page spelling 6221-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6221", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221VV" ], "locale_variants": {} }, { "sku": "6222-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6222VV", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 117, "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6222-RSR run faster than contact-seal 6222-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6222-2RS instead.", "The non-contact lip of 6222-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6222VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 159/117 kN ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6222-RSR bearing?", "a": "A 6222-RSR deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6222-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6222-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6222VV — two low-friction non-contact rubber seals (NSK suffix VV), 110×200×38 mm per ISO 15. Quoted values: C 159 kN, C0 117 kN, mass 4450 g. The industry-neutral page spelling 6222-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222VV" ], "locale_variants": {} }, { "sku": "6224-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6224VV", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 171, "static_load_kN": 131, "weight_g": 5290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6224-RSR run faster than contact-seal 6224-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6224-2RS instead.", "The non-contact lip of 6224-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6224VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 171/131 kN ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6224-RSR bearing?", "a": "A 6224-RSR deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6224-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6224-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6224VV — two low-friction non-contact rubber seals (NSK suffix VV), 120×215×40 mm per ISO 15. Quoted values: C 171 kN, C0 131 kN, mass 5290 g. The industry-neutral page spelling 6224-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224VV" ], "locale_variants": {} }, { "sku": "6228-2RS", "brand": "NSK", "manufacturer_designation": "NSK 6228DDU", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 183, "static_load_kN": 150, "weight_g": 7680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6228-2RS runs slower and cooler-limited than the open 6228; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6228-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6228DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 183/150 kN ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6228-2RS bearing?", "a": "A 6228-2RS deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6228-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6228-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6228DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 140×250×42 mm per ISO 15. Quoted values: C 183 kN, C0 150 kN, mass 7680 g. The industry-neutral page spelling 6228-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6228DDU" ], "locale_variants": {} }, { "sku": "6228-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6228ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 183, "static_load_kN": 150, "weight_g": 7680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6228-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6228-2RS for that.", "Shielded 6228-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6228ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 183/150 kN ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6228-ZZ bearing?", "a": "A 6228-ZZ deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6228-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6228-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6228ZZ — two non-contact steel shields (NSK suffix ZZ), 140×250×42 mm per ISO 15. Quoted values: C 183 kN, C0 150 kN, mass 7680 g. The industry-neutral page spelling 6228-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6228ZZ" ], "locale_variants": {} }, { "sku": "6230-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6230ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 194, "static_load_kN": 168, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6230-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6230-2RS for that.", "Shielded 6230-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6230ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 194/168 kN ratings, mass 10000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6230ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6230-ZZ bearing?", "a": "A 6230-ZZ deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6230-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6230-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6230ZZ — two non-contact steel shields (NSK suffix ZZ), 150×270×45 mm per ISO 15. Quoted values: C 194 kN, C0 168 kN, mass 10000 g. The industry-neutral page spelling 6230-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6230ZZ" ], "locale_variants": {} }, { "sku": "6232-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6232ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 204, "static_load_kN": 186, "weight_g": 12800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6232-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6232-2RS for that.", "Shielded 6232-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6232ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 204/186 kN ratings, mass 12800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6232ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6232-ZZ bearing?", "a": "A 6232-ZZ deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6232 bore code work?", "a": "The last two digits of 6232 are bore code 32, giving 32 × 5 = 160 mm bore. The 290 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6232-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6232-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6232ZZ — two non-contact steel shields (NSK suffix ZZ), 160×290×48 mm per ISO 15. Quoted values: C 204 kN, C0 186 kN, mass 12800 g. The industry-neutral page spelling 6232-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6232", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6232ZZ" ], "locale_variants": {} }, { "sku": "6234-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6234ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 234, "static_load_kN": 224, "weight_g": 15800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 170 mm bore; before upgrading to a 6334 for extra capacity, confirm the housing accepts a 310 mm OD and 52 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6234-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6234-2RS for that.", "Shielded 6234-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6234ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 234/224 kN ratings, mass 15800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6234ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6234-ZZ bearing?", "a": "A 6234-ZZ deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6234-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6234-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6234ZZ — two non-contact steel shields (NSK suffix ZZ), 170×310×52 mm per ISO 15. Quoted values: C 234 kN, C0 224 kN, mass 15800 g. The industry-neutral page spelling 6234-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6234", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6234ZZ" ], "locale_variants": {} }, { "sku": "6236-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6236ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 250, "static_load_kN": 241, "weight_g": 15900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6236-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6236-2RS for that.", "Shielded 6236-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the shielded version as 6236ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 250/241 kN ratings, mass 15900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6236ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6236-ZZ bearing?", "a": "A 6236-ZZ deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6236-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 180 mm bore?", "a": "The '2' is the light diameter series: 320×52 mm with a 70.0 mm radial section at 180 mm bore. A 6336 on the same bore is larger and higher-rated; a 6036 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6236-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6236ZZ — two non-contact steel shields (NSK suffix ZZ), 180×320×52 mm per ISO 15. Quoted values: C 250 kN, C0 241 kN, mass 15900 g. The industry-neutral page spelling 6236-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6236", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6236ZZ" ], "locale_variants": {} }, { "sku": "6238-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6238ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 280, "static_load_kN": 282, "weight_g": 22300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6238-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6238-2RS for that.", "Shielded 6238-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues the shielded version as 6238ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 280/282 kN ratings, mass 22300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6238ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6238-ZZ bearing?", "a": "A 6238-ZZ deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6238-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 190 mm bore?", "a": "The '2' is the light diameter series: 340×55 mm with a 75.0 mm radial section at 190 mm bore. A 6338 on the same bore is larger and higher-rated; a 6038 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6238-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6238ZZ — two non-contact steel shields (NSK suffix ZZ), 190×340×55 mm per ISO 15. Quoted values: C 280 kN, C0 282 kN, mass 22300 g. The industry-neutral page spelling 6238-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6238", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6238ZZ" ], "locale_variants": {} }, { "sku": "6240-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6240ZZ", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 296, "static_load_kN": 310, "weight_g": 26700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6240-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6240-2RS for that.", "Shielded 6240-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues the shielded version as 6240ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 296/310 kN ratings, mass 26700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6240ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6240-ZZ bearing?", "a": "A 6240-ZZ deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6240 bore code work?", "a": "The last two digits of 6240 are bore code 40, giving 40 × 5 = 200 mm bore. The 360 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6240-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6240-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6240ZZ — two non-contact steel shields (NSK suffix ZZ), 200×360×58 mm per ISO 15. Quoted values: C 296 kN, C0 310 kN, mass 26700 g. The industry-neutral page spelling 6240-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6240", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6240ZZ" ], "locale_variants": {} }, { "sku": "6248", "brand": "NSK", "manufacturer_designation": "NSK 6248", "series": "6200-series", "type": "deep_groove", "d_mm": 240, "D_mm": 440, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 375, "static_load_kN": 430, "weight_g": 50500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6248 carries bore code 48 = 240 mm. Outside diameter 440 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 240 mm bore; before upgrading to a 6348 for extra capacity, confirm the housing accepts a 440 mm OD and 72 mm width — it is not a drop-in swap.", "The open 6248 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×440×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6248 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6248 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 375/430 kN ratings, mass 50500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6248; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6248 bearing?", "a": "A 6248 deep-groove ball bearing has a 240 mm bore, 440 mm outer diameter and 72 mm width (9.449 × 17.323 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6248 bore code work?", "a": "The last two digits of 6248 are bore code 48, giving 48 × 5 = 240 mm bore. The 440 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6248 mean?", "a": "A bare 6248 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 240 mm bore?", "a": "The '2' is the light diameter series: 440×72 mm with a 100.0 mm radial section at 240 mm bore. A 6348 on the same bore is larger and higher-rated; a 6048 is smaller and lower-rated." }, { "q": "What is the NSK designation and catalogue data for 6248?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6248 — the open (unsealed) execution, 240×440×72 mm per ISO 15. Quoted values: C 375 kN, C0 430 kN, mass 50500 g. The industry-neutral page spelling 6248 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6248", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6303-2RS", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 113, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6303DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "Contact seals add drag and heat: 6303-2RS runs slower and cooler-limited than the open 6303; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6303-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6303DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 15/6.65 kN ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6303-2RS bearing?", "a": "A 6303-2RS deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6303-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6303-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6303DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 17×47×14 mm per ISO 15. Quoted values: C 15 kN, C0 6.65 kN, mass 113 g. The industry-neutral page spelling 6303-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (2RS vs RSR) — confirm sealing suits the duty." }, { "equiv_sku": "6303", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6303DDU", "material": "GCr15", "dynamic_load_kN": 15, "static_load_kN": 6.65 }, { "sku": "6307-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6307VV", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 36.5, "static_load_kN": 19.2, "weight_g": 464, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "RSR low-friction seals on 6307-RSR run faster than contact-seal 6307-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6307-2RS instead.", "The non-contact lip of 6307-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6307VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 36.5/19.2 kN ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6307-RSR bearing?", "a": "A 6307-RSR deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6307-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6307-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6307VV — two low-friction non-contact rubber seals (NSK suffix VV), 35×80×21 mm per ISO 15. Quoted values: C 36.5 kN, C0 19.2 kN, mass 464 g. The industry-neutral page spelling 6307-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307VV" ], "locale_variants": {} }, { "sku": "6309-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6309VV", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 58.5, "static_load_kN": 32, "weight_g": 829, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "RSR low-friction seals on 6309-RSR run faster than contact-seal 6309-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6309-2RS instead.", "The non-contact lip of 6309-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6309VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 58.5/32 kN ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6309-RSR bearing?", "a": "A 6309-RSR deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6309-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6309-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6309VV — two low-friction non-contact rubber seals (NSK suffix VV), 45×100×25 mm per ISO 15. Quoted values: C 58.5 kN, C0 32 kN, mass 829 g. The industry-neutral page spelling 6309-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309VV" ], "locale_variants": {} }, { "sku": "6310-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6310VV", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 38.5, "weight_g": 1060, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "RSR low-friction seals on 6310-RSR run faster than contact-seal 6310-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6310-2RS instead.", "The non-contact lip of 6310-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6310VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 68/38.5 kN ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6310-RSR bearing?", "a": "A 6310-RSR deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6310-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6310-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6310VV — two low-friction non-contact rubber seals (NSK suffix VV), 50×110×27 mm per ISO 15. Quoted values: C 68 kN, C0 38.5 kN, mass 1060 g. The industry-neutral page spelling 6310-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310VV" ], "locale_variants": {} }, { "sku": "6311-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6311VV", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78.5, "static_load_kN": 44.5, "weight_g": 1370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "RSR low-friction seals on 6311-RSR run faster than contact-seal 6311-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6311-2RS instead.", "The non-contact lip of 6311-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6311VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 78.5/44.5 kN ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6311-RSR bearing?", "a": "A 6311-RSR deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6311-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6311-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6311VV — two low-friction non-contact rubber seals (NSK suffix VV), 55×120×29 mm per ISO 15. Quoted values: C 78.5 kN, C0 44.5 kN, mass 1370 g. The industry-neutral page spelling 6311-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311VV" ], "locale_variants": {} }, { "sku": "6312-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6312VV", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 90, "static_load_kN": 52, "weight_g": 1720, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "RSR low-friction seals on 6312-RSR run faster than contact-seal 6312-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6312-2RS instead.", "The non-contact lip of 6312-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312-RSR.", "NSK catalogues this low-friction non-contact seal as 6312VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 90/52 kN ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6312-RSR bearing?", "a": "A 6312-RSR deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6312-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6312-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6312VV — two low-friction non-contact rubber seals (NSK suffix VV), 60×130×31 mm per ISO 15. Quoted values: C 90 kN, C0 52 kN, mass 1720 g. The industry-neutral page spelling 6312-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312VV" ], "locale_variants": {} }, { "sku": "6313-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6313VV", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 102, "static_load_kN": 60, "weight_g": 2110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "RSR low-friction seals on 6313-RSR run faster than contact-seal 6313-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6313-2RS instead.", "The non-contact lip of 6313-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6313VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 102/60 kN ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6313-RSR bearing?", "a": "A 6313-RSR deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6313-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6313-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6313VV — two low-friction non-contact rubber seals (NSK suffix VV), 65×140×33 mm per ISO 15. Quoted values: C 102 kN, C0 60 kN, mass 2110 g. The industry-neutral page spelling 6313-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313VV" ], "locale_variants": {} }, { "sku": "6314-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6314VV", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 115, "static_load_kN": 68, "weight_g": 2570, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "RSR low-friction seals on 6314-RSR run faster than contact-seal 6314-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6314-2RS instead.", "The non-contact lip of 6314-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6314VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 115/68 kN ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6314-RSR bearing?", "a": "A 6314-RSR deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6314-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6314-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6314VV — two low-friction non-contact rubber seals (NSK suffix VV), 70×150×35 mm per ISO 15. Quoted values: C 115 kN, C0 68 kN, mass 2570 g. The industry-neutral page spelling 6314-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314VV" ], "locale_variants": {} }, { "sku": "6315-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6315VV", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 77, "weight_g": 3080, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "RSR low-friction seals on 6315-RSR run faster than contact-seal 6315-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6315-2RS instead.", "The non-contact lip of 6315-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NSK catalogues this low-friction non-contact seal as 6315VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 125/77 kN ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6315-RSR bearing?", "a": "A 6315-RSR deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6315-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6315-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6315VV — two low-friction non-contact rubber seals (NSK suffix VV), 75×160×37 mm per ISO 15. Quoted values: C 125 kN, C0 77 kN, mass 3080 g. The industry-neutral page spelling 6315-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315VV" ], "locale_variants": {} }, { "sku": "6316-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6316VV", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 135, "static_load_kN": 86.5, "weight_g": 3670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "RSR low-friction seals on 6316-RSR run faster than contact-seal 6316-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6316-2RS instead.", "The non-contact lip of 6316-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues this low-friction non-contact seal as 6316VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 135/86.5 kN ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6316-RSR bearing?", "a": "A 6316-RSR deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6316-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6316-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6316VV — two low-friction non-contact rubber seals (NSK suffix VV), 80×170×39 mm per ISO 15. Quoted values: C 135 kN, C0 86.5 kN, mass 3670 g. The industry-neutral page spelling 6316-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316VV" ], "locale_variants": {} }, { "sku": "6317-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6317VV", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 146, "static_load_kN": 97, "weight_g": 4280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "RSR low-friction seals on 6317-RSR run faster than contact-seal 6317-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6317-2RS instead.", "The non-contact lip of 6317-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NSK catalogues this low-friction non-contact seal as 6317VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 146/97 kN ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6317-RSR bearing?", "a": "A 6317-RSR deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6317-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6317-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6317VV — two low-friction non-contact rubber seals (NSK suffix VV), 85×180×41 mm per ISO 15. Quoted values: C 146 kN, C0 97 kN, mass 4280 g. The industry-neutral page spelling 6317-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317VV" ], "locale_variants": {} }, { "sku": "6318-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6318VV", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 157, "static_load_kN": 107, "weight_g": 4980, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "RSR low-friction seals on 6318-RSR run faster than contact-seal 6318-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6318-2RS instead.", "The non-contact lip of 6318-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318-RSR.", "NSK catalogues this low-friction non-contact seal as 6318VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 157/107 kN ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6318-RSR bearing?", "a": "A 6318-RSR deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6318-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6318-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6318VV — two low-friction non-contact rubber seals (NSK suffix VV), 90×190×43 mm per ISO 15. Quoted values: C 157 kN, C0 107 kN, mass 4980 g. The industry-neutral page spelling 6318-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318VV" ], "locale_variants": {} }, { "sku": "6319-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6319VV", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 168, "static_load_kN": 119, "weight_g": 5760, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "RSR low-friction seals on 6319-RSR run faster than contact-seal 6319-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6319-2RS instead.", "The non-contact lip of 6319-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues this low-friction non-contact seal as 6319VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 168/119 kN ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6319-RSR bearing?", "a": "A 6319-RSR deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6319-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6319-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6319VV — two low-friction non-contact rubber seals (NSK suffix VV), 95×200×45 mm per ISO 15. Quoted values: C 168 kN, C0 119 kN, mass 5760 g. The industry-neutral page spelling 6319-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319VV" ], "locale_variants": {} }, { "sku": "6320-RSR", "brand": "NSK", "manufacturer_designation": "NSK 6320VV", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 191, "static_load_kN": 141, "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "RSR low-friction seals on 6320-RSR run faster than contact-seal 6320-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6320-2RS instead.", "The non-contact lip of 6320-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.", "NSK catalogues this low-friction non-contact seal as 6320VV (suffix VV), the NSK equivalent of the industry-neutral -RSR spelling on this page. VV is not liquid-tight; NSK's contact-seal suffix DDU (industry-neutral -2RS) is the choice for wet or fine-dust duty.", "The 191/141 kN ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320VV; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6320-RSR bearing?", "a": "A 6320-RSR deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6320-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6320-RSR?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6320VV — two low-friction non-contact rubber seals (NSK suffix VV), 100×215×47 mm per ISO 15. Quoted values: C 191 kN, C0 141 kN, mass 7040 g. The industry-neutral page spelling 6320-RSR follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix VV maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320VV" ], "locale_variants": {} }, { "sku": "6320", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7040, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), VV (non-contact seals) and DDU (contact seals).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "The open 6320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6320 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.", "The open 6320 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 191/141 kN ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6320 bearing?", "a": "A 6320 deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6320 mean?", "a": "A bare 6320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6320?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6320 — the open (unsealed) execution, 100×215×47 mm per ISO 15. Quoted values: C 191 kN, C0 141 kN, mass 7040 g. The industry-neutral page spelling 6320 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "6320", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6320", "material": "GCr15", "dynamic_load_kN": 191, "static_load_kN": 141 }, { "sku": "6321-2RS", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8090, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6321DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "Contact seals add drag and heat: 6321-2RS runs slower and cooler-limited than the open 6321; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6321-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NSK catalogues the contact-sealed version as 6321DDU (suffix DDU), the NSK equivalent of the industry-neutral -2RS spelling on this page; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 202/154 kN ratings, mass 8090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6321DDU; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6321-2RS bearing?", "a": "A 6321-2RS deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6321-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6321-2RS?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6321DDU — two contacting rubber seals over a lifetime grease fill (NSK suffix DDU), 105×225×49 mm per ISO 15. Quoted values: C 202 kN, C0 154 kN, mass 8090 g. The industry-neutral page spelling 6321-2RS follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6321", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix DDU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6321DDU" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6321DDU", "material": "GCr15", "dynamic_load_kN": 202, "static_load_kN": 154 }, { "sku": "6322-ZZ", "brand": "NSK", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's catalogue order number is 6322ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "ZZ shields are non-contact: 6322-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6322-2RS for that.", "Shielded 6322-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6322-ZZ.", "NSK catalogues the shielded version as 6322ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 226/179 kN ratings, mass 9510 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6322ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-ZZ bearing?", "a": "A 6322-ZZ deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6322-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6322-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6322ZZ — two non-contact steel shields (NSK suffix ZZ), 110×240×50 mm per ISO 15. Quoted values: C 226 kN, C0 179 kN, mass 9510 g. The industry-neutral page spelling 6322-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." }, { "equiv_sku": "7322", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21322", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6322ZZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "manufacturer_designation": "NSK 6322ZZ", "material": "GCr15", "dynamic_load_kN": 226, "static_load_kN": 179 }, { "sku": "6326-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6326ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 252, "static_load_kN": 214, "weight_g": 15200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "ZZ shields are non-contact: 6326-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6326-2RS for that.", "Shielded 6326-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 58 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6326ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 252/214 kN ratings, mass 15200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6326ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6326-ZZ bearing?", "a": "A 6326-ZZ deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6326-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6326-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6326ZZ — two non-contact steel shields (NSK suffix ZZ), 130×280×58 mm per ISO 15. Quoted values: C 252 kN, C0 214 kN, mass 15200 g. The industry-neutral page spelling 6326-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6326", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6326ZZ" ], "locale_variants": {} }, { "sku": "6328-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6328ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 278, "static_load_kN": 246, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.", "ZZ shields are non-contact: 6328-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6328-2RS for that.", "Shielded 6328-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328-ZZ.", "NSK catalogues the shielded version as 6328ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 278/246 kN ratings, mass 18500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6328ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6328-ZZ bearing?", "a": "A 6328-ZZ deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6328 bore code work?", "a": "The last two digits of 6328 are bore code 28, giving 28 × 5 = 140 mm bore. The 300 mm outside diameter and 62 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6328-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 140 mm bore?", "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6328-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6328ZZ — two non-contact steel shields (NSK suffix ZZ), 140×300×62 mm per ISO 15. Quoted values: C 278 kN, C0 246 kN, mass 18500 g. The industry-neutral page spelling 6328-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6328", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6328ZZ" ], "locale_variants": {} }, { "sku": "6330-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6330ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 300, "static_load_kN": 284, "weight_g": 22700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6330 carries bore code 30 = 150 mm. Outside diameter 320 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.", "ZZ shields are non-contact: 6330-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6330-2RS for that.", "Shielded 6330-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6330-C3. No clearance suffix means normal CN clearance.", "NSK catalogues the shielded version as 6330ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 300/284 kN ratings, mass 22700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6330ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6330-ZZ bearing?", "a": "A 6330-ZZ deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6330-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6330-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6330ZZ — two non-contact steel shields (NSK suffix ZZ), 150×320×65 mm per ISO 15. Quoted values: C 300 kN, C0 284 kN, mass 22700 g. The industry-neutral page spelling 6330-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6330", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6330ZZ" ], "locale_variants": {} }, { "sku": "6332-ZZ", "brand": "NSK", "manufacturer_designation": "NSK 6332ZZ", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 287, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 160 mm bore through a 340 mm OD and 68 mm width; the heavier rolling elements also trade away some speed versus a 6232.", "ZZ shields are non-contact: 6332-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6332-2RS for that.", "Shielded 6332-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 68 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NSK catalogues the shielded version as 6332ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.", "The 305/287 kN ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6332-ZZ bearing?", "a": "A 6332-ZZ deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6332 bore code work?", "a": "The last two digits of 6332 are bore code 32, giving 32 × 5 = 160 mm bore. The 340 mm outside diameter and 68 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6332-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 160 mm bore?", "a": "The '3' is the medium diameter series: 340×68 mm, 90.0 mm radial section at 160 mm bore, carrying more load than a 6232 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6332-ZZ?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6332ZZ — two non-contact steel shields (NSK suffix ZZ), 160×340×68 mm per ISO 15. Quoted values: C 305 kN, C0 287 kN, mass 26200 g. The industry-neutral page spelling 6332-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6332", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6332ZZ" ], "locale_variants": {} }, { "sku": "6332", "brand": "NSK", "manufacturer_designation": "NSK 6332", "series": "6300-series", "type": "deep_groove", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 305, "static_load_kN": 287, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6332 carries bore code 32 = 160 mm. Outside diameter 340 mm and width 68 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 160 mm bore through a 340 mm OD and 68 mm width; the heavier rolling elements also trade away some speed versus a 6232.", "The open 6332 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×340×68 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6332 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6332-C3. No clearance suffix means normal CN clearance.", "The open 6332 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 305/287 kN ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6332 bearing?", "a": "A 6332 deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6332 bore code work?", "a": "The last two digits of 6332 are bore code 32, giving 32 × 5 = 160 mm bore. The 340 mm outside diameter and 68 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6332 mean?", "a": "A bare 6332 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 160 mm bore?", "a": "The '3' is the medium diameter series: 340×68 mm, 90.0 mm radial section at 160 mm bore, carrying more load than a 6232 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6332?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6332 — the open (unsealed) execution, 160×340×68 mm per ISO 15. Quoted values: C 305 kN, C0 287 kN, mass 26200 g. The industry-neutral page spelling 6332 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6332", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6340", "brand": "NSK", "manufacturer_designation": "NSK 6340", "series": "6300-series", "type": "deep_groove", "d_mm": 200, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 445, "weight_g": 55300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6340 carries bore code 40 = 200 mm. Outside diameter 420 mm and width 80 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 200 mm bore through a 420 mm OD and 80 mm width; the heavier rolling elements also trade away some speed versus a 6240.", "The open 6340 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×420×80 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6340 units.", "Shaft and housing fillets must clear the bearing chamfer so the 80 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6340 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 415/445 kN ratings, mass 55300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6340; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6340 bearing?", "a": "A 6340 deep-groove ball bearing has a 200 mm bore, 420 mm outer diameter and 80 mm width (7.874 × 16.535 × 3.15 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6340 bore code work?", "a": "The last two digits of 6340 are bore code 40, giving 40 × 5 = 200 mm bore. The 420 mm outside diameter and 80 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6340 mean?", "a": "A bare 6340 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 200 mm bore?", "a": "The '3' is the medium diameter series: 420×80 mm, 110.0 mm radial section at 200 mm bore, carrying more load than a 6240 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6340?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6340 — the open (unsealed) execution, 200×420×80 mm per ISO 15. Quoted values: C 415 kN, C0 445 kN, mass 55300 g. The industry-neutral page spelling 6340 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6340", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6344", "brand": "NSK", "manufacturer_designation": "NSK 6344", "series": "6300-series", "type": "deep_groove", "d_mm": 220, "D_mm": 460, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 450, "static_load_kN": 520, "weight_g": 73900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6344 carries bore code 44 = 220 mm. Outside diameter 460 mm and width 88 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 220 mm bore through a 460 mm OD and 88 mm width; the heavier rolling elements also trade away some speed versus a 6244.", "The open 6344 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×460×88 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6344 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6344-C3. No clearance suffix means normal CN clearance.", "The open 6344 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 450/520 kN ratings, mass 73900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6344; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6344 bearing?", "a": "A 6344 deep-groove ball bearing has a 220 mm bore, 460 mm outer diameter and 88 mm width (8.661 × 18.11 × 3.465 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6344 bore code work?", "a": "The last two digits of 6344 are bore code 44, giving 44 × 5 = 220 mm bore. The 460 mm outside diameter and 88 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6344 mean?", "a": "A bare 6344 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 220 mm bore?", "a": "The '3' is the medium diameter series: 460×88 mm, 120.0 mm radial section at 220 mm bore, carrying more load than a 6244 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6344?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6344 — the open (unsealed) execution, 220×460×88 mm per ISO 15. Quoted values: C 450 kN, C0 520 kN, mass 73900 g. The industry-neutral page spelling 6344 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6344", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "6348", "brand": "NSK", "manufacturer_designation": "NSK 6348", "series": "6300-series", "type": "deep_groove", "d_mm": 240, "D_mm": 500, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 515, "static_load_kN": 625, "weight_g": 94400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6348 carries bore code 48 = 240 mm. Outside diameter 500 mm and width 95 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 240 mm bore through a 500 mm OD and 95 mm width; the heavier rolling elements also trade away some speed versus a 6248.", "The open 6348 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×500×95 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6348 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 500 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6348.", "The open 6348 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).", "The 515/625 kN ratings, mass 94400 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6348; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6348 bearing?", "a": "A 6348 deep-groove ball bearing has a 240 mm bore, 500 mm outer diameter and 95 mm width (9.449 × 19.685 × 3.74 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6348 bore code work?", "a": "The last two digits of 6348 are bore code 48, giving 48 × 5 = 240 mm bore. The 500 mm outside diameter and 95 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6348 mean?", "a": "A bare 6348 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 240 mm bore?", "a": "The '3' is the medium diameter series: 500×95 mm, 130.0 mm radial section at 240 mm bore, carrying more load than a 6248 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NSK designation and catalogue data for 6348?", "a": "In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6348 — the open (unsealed) execution, 240×500×95 mm per ISO 15. Quoted values: C 515 kN, C0 625 kN, mass 94400 g. The industry-neutral page spelling 6348 follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service." } ], "cross_ref": [ { "equiv_sku": "6348", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier." } ], "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf", "catalog_ver": "NSK Rolling Bearings E1103 Part C", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {} }, { "sku": "16001", "brand": "NTN", "manufacturer_designation": "NTN 16001JRX", "series": "16000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.65, "static_load_kN": 2.39, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 26000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 16001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 160xx narrow section at 12 mm bore shares the 28 mm outside diameter of the 6001 but is only 7 mm wide; a 6001 in a 7 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16001 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16001 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 5.65/2.39 kN load ratings, 0.19 kN fatigue load limit Cu and 19 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16001JRX; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16001 bearing?", "a": "A 16001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 7 mm width (0.472 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 16001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 16001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 16001 mean?", "a": "A bare 16001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 12 mm bore?", "a": "160 is the narrow extra-light section: 28×7 mm with an 8.0 mm radial section at 12 mm bore. It has the same bore and outside diameter as the 6001 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16001?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16001JRX — the open (unsealed) execution, 12×28×7 mm per ISO 15. Quoted values: C 5.65 kN, C0 2.39 kN, Cu 0.19 kN, mass 19 g. Grease limiting speed 26000 rpm. The industry-neutral page spelling 16001 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16001", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "16001jrx" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=4", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6403-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6403ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6403-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6403-2RS for that.", "Shielded 6403-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6403-ZZ.", "NTN catalogues the shielded version as 6403ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 25.2/10.8 kN load ratings, 0.84 kN fatigue load limit Cu and 270 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6403ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6403-ZZ bearing?", "a": "A 6403-ZZ deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6403-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6403-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6403ZZ — two non-contact steel shields (NTN suffix ZZ), 17×62×17 mm per ISO 15. Quoted values: C 25.2 kN, C0 10.8 kN, Cu 0.84 kN, mass 270 g. Grease limiting speed 14000 rpm. The industry-neutral page spelling 6403-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6403", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6403", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=4", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6403-zz", "6403zz" ], "locale_variants": {}, "dynamic_load_kN": 25.2, "static_load_kN": 10.8, "load_derived": true, "manufacturer_designation": "NTN 6403ZZ", "material": "GCr15", "fatigue_load_limit_kN": 0.84, "limiting_speed_rpm": 14000 }, { "sku": "6404-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6404ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6404-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6404-2RS for that.", "Shielded 6404-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6404ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 31.5/13.9 kN load ratings, 1.09 kN fatigue load limit Cu and 400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6404ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6404-ZZ bearing?", "a": "A 6404-ZZ deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6404-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6404-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6404ZZ — two non-contact steel shields (NTN suffix ZZ), 20×72×19 mm per ISO 15. Quoted values: C 31.5 kN, C0 13.9 kN, Cu 1.09 kN, mass 400 g. Grease limiting speed 12000 rpm. The industry-neutral page spelling 6404-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6404", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6404-zz", "6404zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 31.5, "static_load_kN": 13.9, "load_derived": true, "manufacturer_designation": "NTN 6404ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.09, "limiting_speed_rpm": 12000 }, { "sku": "6405-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6405ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6405-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6405-2RS for that.", "Shielded 6405-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6405-ZZ-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6405ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 38.5/17.5 kN load ratings, 1.36 kN fatigue load limit Cu and 530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6405ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6405-ZZ bearing?", "a": "A 6405-ZZ deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6405-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6405-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6405ZZ — two non-contact steel shields (NTN suffix ZZ), 25×80×21 mm per ISO 15. Quoted values: C 38.5 kN, C0 17.5 kN, Cu 1.36 kN, mass 530 g. Grease limiting speed 10000 rpm. The industry-neutral page spelling 6405-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6405", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6405-zz", "6405zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 38.5, "static_load_kN": 17.5, "load_derived": true, "manufacturer_designation": "NTN 6405ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.36, "limiting_speed_rpm": 10000 }, { "sku": "6406-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 735, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6406ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6406-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6406-2RS for that.", "Shielded 6406-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6406ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 48/23.9 kN load ratings, 1.86 kN fatigue load limit Cu and 735 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6406ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6406-ZZ bearing?", "a": "A 6406-ZZ deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6406-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6406-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6406ZZ — two non-contact steel shields (NTN suffix ZZ), 30×90×23 mm per ISO 15. Quoted values: C 48 kN, C0 23.9 kN, Cu 1.86 kN, mass 735 g. Grease limiting speed 8800 rpm. The industry-neutral page spelling 6406-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6406", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6406-zz", "6406zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 48, "static_load_kN": 23.9, "load_derived": true, "manufacturer_designation": "NTN 6406ZZ", "material": "GCr15", "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 8800 }, { "sku": "6407-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 952, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6407ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6407-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6407-2RS for that.", "Shielded 6407-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the shielded version as 6407ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 61/31 kN load ratings, 2.43 kN fatigue load limit Cu and 952 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6407ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6407-ZZ bearing?", "a": "A 6407-ZZ deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6407-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6407-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6407ZZ — two non-contact steel shields (NTN suffix ZZ), 35×100×25 mm per ISO 15. Quoted values: C 61 kN, C0 31 kN, Cu 2.43 kN, mass 952 g. Grease limiting speed 7800 rpm. The industry-neutral page spelling 6407-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6407", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=5", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6407-zz", "6407zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 61, "static_load_kN": 31, "load_derived": true, "manufacturer_designation": "NTN 6407ZZ", "material": "GCr15", "fatigue_load_limit_kN": 2.43, "limiting_speed_rpm": 7800 }, { "sku": "6408-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6408ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6408-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6408-2RS for that.", "Shielded 6408-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the shielded version as 6408ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 70.5/36.5 kN load ratings, 2.85 kN fatigue load limit Cu and 1230 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6408ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6408-ZZ bearing?", "a": "A 6408-ZZ deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6408-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6408-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6408ZZ — two non-contact steel shields (NTN suffix ZZ), 40×110×27 mm per ISO 15. Quoted values: C 70.5 kN, C0 36.5 kN, Cu 2.85 kN, mass 1230 g. Grease limiting speed 7000 rpm. The industry-neutral page spelling 6408-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6408", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6408-zz", "6408zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 70.5, "static_load_kN": 36.5, "load_derived": true, "manufacturer_designation": "NTN 6408ZZ", "material": "GCr15", "fatigue_load_limit_kN": 2.85, "limiting_speed_rpm": 7000 }, { "sku": "16009", "brand": "NTN", "manufacturer_designation": "NTN 16009", "series": "16000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.3, "static_load_kN": 10.5, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 9200, "weight_g": 171, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16009; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 160xx narrow section at 45 mm bore shares the 75 mm outside diameter of the 6009 but is only 10 mm wide; a 6009 in a 10 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16009 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16009 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16009 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 14.3/10.5 kN load ratings, 0.72 kN fatigue load limit Cu and 171 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16009; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16009 bearing?", "a": "A 16009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 10 mm width (1.772 × 2.953 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16009 bore code work?", "a": "The last two digits of 16009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16009 mean?", "a": "A bare 16009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 45 mm bore?", "a": "160 is the narrow extra-light section: 75×10 mm with a 15.0 mm radial section at 45 mm bore. It has the same bore and outside diameter as the 6009 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16009?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16009 — the open (unsealed) execution, 45×75×10 mm per ISO 15. Quoted values: C 14.3 kN, C0 10.5 kN, Cu 0.72 kN, mass 171 g. Grease limiting speed 9200 rpm. The industry-neutral page spelling 16009 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16009", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6409-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1530, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6409ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6409-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6409-2RS for that.", "Shielded 6409-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6409-ZZ.", "NTN catalogues the shielded version as 6409ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 85.5/45 kN load ratings, 3.5 kN fatigue load limit Cu and 1530 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6409ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6409-ZZ bearing?", "a": "A 6409-ZZ deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6409-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6409-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6409ZZ — two non-contact steel shields (NTN suffix ZZ), 45×120×29 mm per ISO 15. Quoted values: C 85.5 kN, C0 45 kN, Cu 3.5 kN, mass 1530 g. Grease limiting speed 6300 rpm. The industry-neutral page spelling 6409-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6409", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6409-zz", "6409zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 85.5, "static_load_kN": 45, "load_derived": true, "manufacturer_designation": "NTN 6409ZZ", "material": "GCr15", "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 6300 }, { "sku": "16010", "brand": "NTN", "manufacturer_designation": "NTN 16010", "series": "16000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.7, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.76, "limiting_speed_rpm": 8400, "weight_g": 180, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16010 with C3 for those conditions.", "The 160xx narrow section at 50 mm bore shares the 80 mm outside diameter of the 6010 but is only 10 mm wide; a 6010 in a 10 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16010 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16010-C3. No clearance suffix means normal CN clearance.", "The open 16010 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 14.7/11.3 kN load ratings, 0.76 kN fatigue load limit Cu and 180 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16010; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16010 bearing?", "a": "A 16010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 10 mm width (1.969 × 3.15 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16010 bore code work?", "a": "The last two digits of 16010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16010 mean?", "a": "A bare 16010 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 50 mm bore?", "a": "160 is the narrow extra-light section: 80×10 mm with a 15.0 mm radial section at 50 mm bore. It has the same bore and outside diameter as the 6010 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16010?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16010 — the open (unsealed) execution, 50×80×10 mm per ISO 15. Quoted values: C 14.7 kN, C0 11.3 kN, Cu 0.76 kN, mass 180 g. Grease limiting speed 8400 rpm. The industry-neutral page spelling 16010 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16010", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6410-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6410ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6410-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6410-2RS for that.", "Shielded 6410-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the shielded version as 6410ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 92/49.5 kN load ratings, 3.85 kN fatigue load limit Cu and 1880 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6410ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6410-ZZ bearing?", "a": "A 6410-ZZ deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6410-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6410-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6410ZZ — two non-contact steel shields (NTN suffix ZZ), 50×130×31 mm per ISO 15. Quoted values: C 92 kN, C0 49.5 kN, Cu 3.85 kN, mass 1880 g. Grease limiting speed 5700 rpm. The industry-neutral page spelling 6410-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6410", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6410-zz", "6410zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 92, "static_load_kN": 49.5, "load_derived": true, "manufacturer_designation": "NTN 6410ZZ", "material": "GCr15", "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 5700 }, { "sku": "6411-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6411ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6411-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6411-2RS for that.", "Shielded 6411-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6411-ZZ-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the shielded version as 6411ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 98.5/54 kN load ratings, 4.2 kN fatigue load limit Cu and 2290 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6411ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6411-ZZ bearing?", "a": "A 6411-ZZ deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6411-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6411-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6411ZZ — two non-contact steel shields (NTN suffix ZZ), 55×140×33 mm per ISO 15. Quoted values: C 98.5 kN, C0 54 kN, Cu 4.2 kN, mass 2290 g. Grease limiting speed 5200 rpm. The industry-neutral page spelling 6411-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6411", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6411-zz", "6411zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 98.5, "static_load_kN": 54, "load_derived": true, "manufacturer_designation": "NTN 6411ZZ", "material": "GCr15", "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 5200 }, { "sku": "16012", "brand": "NTN", "manufacturer_designation": "NTN 16012", "series": "16000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.1, "static_load_kN": 17.5, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 7000, "weight_g": 283, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16012 with C3 for those conditions.", "The 160xx narrow section at 60 mm bore shares the 95 mm outside diameter of the 6012 but is only 11 mm wide; a 6012 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16012 units.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16012 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 22.1/17.5 kN load ratings, 1.2 kN fatigue load limit Cu and 283 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16012; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16012 bearing?", "a": "A 16012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 11 mm width (2.362 × 3.74 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16012 bore code work?", "a": "The last two digits of 16012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16012 mean?", "a": "A bare 16012 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 60 mm bore?", "a": "160 is the narrow extra-light section: 95×11 mm with a 17.5 mm radial section at 60 mm bore. It has the same bore and outside diameter as the 6012 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16012?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16012 — the open (unsealed) execution, 60×95×11 mm per ISO 15. Quoted values: C 22.1 kN, C0 17.5 kN, Cu 1.2 kN, mass 283 g. Grease limiting speed 7000 rpm. The industry-neutral page spelling 16012 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16012", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6412-ZZ", "brand": "NTN", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2770, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN catalogue order number: 6412ZZ (suffix ZZ), mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "ZZ shields are non-contact: 6412-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6412-2RS for that.", "Shielded 6412-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the shielded version as 6412ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NTN order number when buying from an NTN channel.", "The 113/64.5 kN load ratings, 4.9 kN fatigue load limit Cu and 2770 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6412ZZ; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6412-ZZ bearing?", "a": "A 6412-ZZ deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6412-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the NTN designation and catalogue data for 6412-ZZ?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6412ZZ — two non-contact steel shields (NTN suffix ZZ), 60×150×35 mm per ISO 15. Quoted values: C 113 kN, C0 64.5 kN, Cu 4.9 kN, mass 2770 g. Grease limiting speed 4800 rpm. The industry-neutral page spelling 6412-ZZ follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6412", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=6", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6412-zz", "6412zz" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 113, "static_load_kN": 64.5, "load_derived": true, "manufacturer_designation": "NTN 6412ZZ", "material": "GCr15", "fatigue_load_limit_kN": 4.9, "limiting_speed_rpm": 4800 }, { "sku": "16013", "brand": "NTN", "manufacturer_designation": "NTN 16013", "series": "16000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.7, "static_load_kN": 18.7, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 6500, "weight_g": 307, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16013 with C3 for those conditions.", "The 160xx narrow section at 65 mm bore shares the 100 mm outside diameter of the 6013 but is only 11 mm wide; a 6013 in an 11 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16013 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16013 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 22.7/18.7 kN load ratings, 1.26 kN fatigue load limit Cu and 307 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16013; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16013 bearing?", "a": "A 16013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 11 mm width (2.559 × 3.937 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16013 bore code work?", "a": "The last two digits of 16013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16013 mean?", "a": "A bare 16013 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 65 mm bore?", "a": "160 is the narrow extra-light section: 100×11 mm with a 17.5 mm radial section at 65 mm bore. It has the same bore and outside diameter as the 6013 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16013?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16013 — the open (unsealed) execution, 65×100×11 mm per ISO 15. Quoted values: C 22.7 kN, C0 18.7 kN, Cu 1.26 kN, mass 307 g. Grease limiting speed 6500 rpm. The industry-neutral page spelling 16013 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16013", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16014", "brand": "NTN", "manufacturer_designation": "NTN 16014", "series": "16000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27, "static_load_kN": 22.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 6100, "weight_g": 441, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16014 with C3 for those conditions.", "The 160xx narrow section at 70 mm bore shares the 110 mm outside diameter of the 6014 but is only 13 mm wide; a 6014 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16014 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16014.", "The open 16014 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 27/22.6 kN load ratings, 1.52 kN fatigue load limit Cu and 441 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16014; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16014 bearing?", "a": "A 16014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 13 mm width (2.756 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16014 bore code work?", "a": "The last two digits of 16014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16014 mean?", "a": "A bare 16014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 70 mm bore?", "a": "160 is the narrow extra-light section: 110×13 mm with a 20.0 mm radial section at 70 mm bore. It has the same bore and outside diameter as the 6014 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16014?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16014 — the open (unsealed) execution, 70×110×13 mm per ISO 15. Quoted values: C 27 kN, C0 22.6 kN, Cu 1.52 kN, mass 441 g. Grease limiting speed 6100 rpm. The industry-neutral page spelling 16014 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16014", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16015", "brand": "NTN", "manufacturer_designation": "NTN 16015", "series": "16000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.6, "static_load_kN": 24, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 5700, "weight_g": 464, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 16015 with C3 for those conditions.", "The 160xx narrow section at 75 mm bore shares the 115 mm outside diameter of the 6015 but is only 13 mm wide; a 6015 in a 13 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16015 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16015 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 27.6/24 kN load ratings, 1.6 kN fatigue load limit Cu and 464 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16015; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16015 bearing?", "a": "A 16015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 13 mm width (2.953 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16015 bore code work?", "a": "The last two digits of 16015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16015 mean?", "a": "A bare 16015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 75 mm bore?", "a": "160 is the narrow extra-light section: 115×13 mm with a 20.0 mm radial section at 75 mm bore. It has the same bore and outside diameter as the 6015 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16015?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16015 — the open (unsealed) execution, 75×115×13 mm per ISO 15. Quoted values: C 27.6 kN, C0 24 kN, Cu 1.6 kN, mass 464 g. Grease limiting speed 5700 rpm. The industry-neutral page spelling 16015 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16015", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16016", "brand": "NTN", "manufacturer_designation": "NTN 16016", "series": "16000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.1, "static_load_kN": 25.1, "fatigue_load_limit_kN": 1.64, "limiting_speed_rpm": 5300, "weight_g": 597, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 80 mm bore shares the 125 mm outside diameter of the 6016 but is only 14 mm wide; a 6016 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16016 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16016-C3. No clearance suffix means normal CN clearance.", "The open 16016 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 28.1/25.1 kN load ratings, 1.64 kN fatigue load limit Cu and 597 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16016; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16016 bearing?", "a": "A 16016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 14 mm width (3.15 × 4.921 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16016 bore code work?", "a": "The last two digits of 16016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16016 mean?", "a": "A bare 16016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 80 mm bore?", "a": "160 is the narrow extra-light section: 125×14 mm with a 22.5 mm radial section at 80 mm bore. It has the same bore and outside diameter as the 6016 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16016?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16016 — the open (unsealed) execution, 80×125×14 mm per ISO 15. Quoted values: C 28.1 kN, C0 25.1 kN, Cu 1.64 kN, mass 597 g. Grease limiting speed 5300 rpm. The industry-neutral page spelling 16016 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16016", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16017", "brand": "NTN", "manufacturer_designation": "NTN 16017", "series": "16000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.7, "static_load_kN": 26.2, "fatigue_load_limit_kN": 1.68, "limiting_speed_rpm": 5000, "weight_g": 626, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 85 mm bore shares the 130 mm outside diameter of the 6017 but is only 14 mm wide; a 6017 in a 14 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16017 units.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 16017 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 28.7/26.2 kN load ratings, 1.68 kN fatigue load limit Cu and 626 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16017; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16017 bearing?", "a": "A 16017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 14 mm width (3.346 × 5.118 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16017 bore code work?", "a": "The last two digits of 16017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16017 mean?", "a": "A bare 16017 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 85 mm bore?", "a": "160 is the narrow extra-light section: 130×14 mm with a 22.5 mm radial section at 85 mm bore. It has the same bore and outside diameter as the 6017 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16017?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16017 — the open (unsealed) execution, 85×130×14 mm per ISO 15. Quoted values: C 28.7 kN, C0 26.2 kN, Cu 1.68 kN, mass 626 g. Grease limiting speed 5000 rpm. The industry-neutral page spelling 16017 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16017", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=7", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16018", "brand": "NTN", "manufacturer_designation": "NTN 16018", "series": "16000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 33.5, "fatigue_load_limit_kN": 2.07, "limiting_speed_rpm": 4700, "weight_g": 848, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 90 mm bore shares the 140 mm outside diameter of the 6018 but is only 16 mm wide; a 6018 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16018 units.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16018 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 37/33.5 kN load ratings, 2.07 kN fatigue load limit Cu and 848 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16018; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16018 bearing?", "a": "A 16018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 16 mm width (3.543 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16018 bore code work?", "a": "The last two digits of 16018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16018 mean?", "a": "A bare 16018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 90 mm bore?", "a": "160 is the narrow extra-light section: 140×16 mm with a 25.0 mm radial section at 90 mm bore. It has the same bore and outside diameter as the 6018 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16018?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16018 — the open (unsealed) execution, 90×140×16 mm per ISO 15. Quoted values: C 37 kN, C0 33.5 kN, Cu 2.07 kN, mass 848 g. Grease limiting speed 4700 rpm. The industry-neutral page spelling 16018 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16018", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16019", "brand": "NTN", "manufacturer_designation": "NTN 16019", "series": "16000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38, "static_load_kN": 35, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 4500, "weight_g": 885, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 95 mm bore shares the 145 mm outside diameter of the 6019 but is only 16 mm wide; a 6019 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16019 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 16019 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 38/35 kN load ratings, 2.13 kN fatigue load limit Cu and 885 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16019; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16019 bearing?", "a": "A 16019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 16 mm width (3.74 × 5.709 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16019 bore code work?", "a": "The last two digits of 16019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16019 mean?", "a": "A bare 16019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 95 mm bore?", "a": "160 is the narrow extra-light section: 145×16 mm with a 25.0 mm radial section at 95 mm bore. It has the same bore and outside diameter as the 6019 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16019?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16019 — the open (unsealed) execution, 95×145×16 mm per ISO 15. Quoted values: C 38 kN, C0 35 kN, Cu 2.13 kN, mass 885 g. Grease limiting speed 4500 rpm. The industry-neutral page spelling 16019 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16019", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16020", "brand": "NTN", "manufacturer_designation": "NTN 16020", "series": "16000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 39, "static_load_kN": 36.5, "fatigue_load_limit_kN": 2.18, "limiting_speed_rpm": 4200, "weight_g": 910, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 100 mm bore shares the 150 mm outside diameter of the 6020 but is only 16 mm wide; a 6020 in a 16 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16020 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16020.", "The open 16020 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 39/36.5 kN load ratings, 2.18 kN fatigue load limit Cu and 910 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16020; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16020 bearing?", "a": "A 16020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 16 mm width (3.937 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16020 bore code work?", "a": "The last two digits of 16020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16020 mean?", "a": "A bare 16020 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 100 mm bore?", "a": "160 is the narrow extra-light section: 150×16 mm with a 25.0 mm radial section at 100 mm bore. It has the same bore and outside diameter as the 6020 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16020?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16020 — the open (unsealed) execution, 100×150×16 mm per ISO 15. Quoted values: C 39 kN, C0 36.5 kN, Cu 2.18 kN, mass 910 g. Grease limiting speed 4200 rpm. The industry-neutral page spelling 16020 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16020", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61921-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 816, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6921LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61921-2RS runs slower and cooler-limited than the open 61921; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61921-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues the contact-sealed version as 6921LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 47/42 kN load ratings, 2.52 kN fatigue load limit Cu and 816 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6921LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61921-2RS bearing?", "a": "A 61921-2RS deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61921-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61921-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6921LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 105×145×20 mm per ISO 15. Quoted values: C 47 kN, C0 42 kN, Cu 2.52 kN, mass 816 g. Grease limiting speed 2500 rpm. The industry-neutral page spelling 61921-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61921", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61921", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61921-llu", "6921llu" ], "locale_variants": {}, "dynamic_load_kN": 47, "static_load_kN": 42, "load_derived": true, "manufacturer_designation": "NTN 6921LLU", "material": "GCr15", "fatigue_load_limit_kN": 2.52, "limiting_speed_rpm": 2500 }, { "sku": "16021", "brand": "NTN", "manufacturer_designation": "NTN 16021", "series": "16000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57.5, "static_load_kN": 50.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 4000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 105 mm bore shares the 160 mm outside diameter of the 6021 but is only 18 mm wide; a 6021 in a 18 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16021 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 16021 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 57.5/50.5 kN load ratings, 3 kN fatigue load limit Cu and 1200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16021; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16021 bearing?", "a": "A 16021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 18 mm width (4.134 × 6.299 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16021 bore code work?", "a": "The last two digits of 16021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16021 mean?", "a": "A bare 16021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 105 mm bore?", "a": "160 is the narrow extra-light section: 160×18 mm with a 27.5 mm radial section at 105 mm bore. It has the same bore and outside diameter as the 6021 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16021?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16021 — the open (unsealed) execution, 105×160×18 mm per ISO 15. Quoted values: C 57.5 kN, C0 50.5 kN, Cu 3 kN, mass 1200 g. Grease limiting speed 4000 rpm. The industry-neutral page spelling 16021 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16021", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16022", "brand": "NTN", "manufacturer_designation": "NTN 16022", "series": "16000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63.5, "static_load_kN": 56.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 3800, "weight_g": 1460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 110 mm bore shares the 170 mm outside diameter of the 6022 but is only 19 mm wide; a 6022 in a 19 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16022 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16022-C3. No clearance suffix means normal CN clearance.", "The open 16022 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 63.5/56.5 kN load ratings, 3.25 kN fatigue load limit Cu and 1460 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16022; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16022 bearing?", "a": "A 16022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 19 mm width (4.331 × 6.693 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16022 bore code work?", "a": "The last two digits of 16022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16022 mean?", "a": "A bare 16022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 110 mm bore?", "a": "160 is the narrow extra-light section: 170×19 mm with a 30.0 mm radial section at 110 mm bore. It has the same bore and outside diameter as the 6022 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16022?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16022 — the open (unsealed) execution, 110×170×19 mm per ISO 15. Quoted values: C 63.5 kN, C0 56.5 kN, Cu 3.25 kN, mass 1460 g. Grease limiting speed 3800 rpm. The industry-neutral page spelling 16022 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16022", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6322-2RS", "brand": "NTN", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6322LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "Contact seals add drag and heat: 6322-2RS runs slower and cooler-limited than the open 6322; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6322-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6322-2RS-C3. No clearance suffix means normal CN clearance.", "NTN catalogues the contact-sealed version as 6322LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-2RS bearing?", "a": "A 6322-2RS deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6322-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN designation and catalogue data for 6322-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6322LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LLU), 110×240×50 mm per ISO 15. Quoted values: C 227 kN, C0 179 kN, Cu 10.5 kN, mass 9540 g. Grease limiting speed 1900 rpm. The industry-neutral page spelling 6322-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6322-llu", "6322llu" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ], "dynamic_load_kN": 227, "static_load_kN": 179, "load_derived": true, "manufacturer_designation": "NTN 6322LLU", "material": "GCr15", "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 1900 }, { "sku": "6322-RSR", "brand": "NTN", "manufacturer_designation": "NTN 6322LLB", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 227, "static_load_kN": 179, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2900, "weight_g": 9540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's non-contact seal suffix is LLB/LLF (catalogue number 6322LLB), mapped here from the industry-neutral -RSR spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "RSR low-friction seals on 6322-RSR run faster than contact-seal 6322-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6322-2RS instead.", "The non-contact lip of 6322-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "NTN catalogues this low-friction non-contact seal as 6322LLB (suffix LLB), mapped here from the industry-neutral -RSR spelling. NTN rates its speed capability the same as the open bearing, but it is not liquid-tight — for wet or fine-dust duty step up to the LLU contact seal (industry-neutral -2RS).", "The 227/179 kN load ratings, 10.5 kN fatigue load limit Cu and 9540 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6322LLB; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6322-RSR bearing?", "a": "A 6322-RSR deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6322-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the NTN designation and catalogue data for 6322-RSR?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6322LLB — two low-friction non-contact rubber seals (NTN suffix LLB), 110×240×50 mm per ISO 15. Quoted values: C 227 kN, C0 179 kN, Cu 10.5 kN, mass 9540 g. Grease limiting speed 2900 rpm. The industry-neutral page spelling 6322-RSR follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6322", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLB maps to industry-neutral RSR. Verify seal design, grease and speed rating per brand catalogue." } ], "aliases": [ "6322-llb", "6322llb" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61924-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6924LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61924-2RS runs slower and cooler-limited than the open 61924; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61924-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "NTN catalogues the contact-sealed version as 6924LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 59/54 kN load ratings, 3.05 kN fatigue load limit Cu and 1150 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6924LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61924-2RS bearing?", "a": "A 61924-2RS deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61924-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61924-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6924LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 120×165×22 mm per ISO 15. Quoted values: C 59 kN, C0 54 kN, Cu 3.05 kN, mass 1150 g. Grease limiting speed 2100 rpm. The industry-neutral page spelling 61924-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61924", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=8", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61924-llu", "6924llu" ], "locale_variants": {}, "dynamic_load_kN": 59, "static_load_kN": 54, "load_derived": true, "manufacturer_designation": "NTN 6924LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 2100 }, { "sku": "61926-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1520, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6926LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61926-2RS runs slower and cooler-limited than the open 61926; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61926-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6926LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 72/67.5 kN load ratings, 3.65 kN fatigue load limit Cu and 1520 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6926LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61926-2RS bearing?", "a": "A 61926-2RS deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61926-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61926-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6926LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 130×180×24 mm per ISO 15. Quoted values: C 72 kN, C0 67.5 kN, Cu 3.65 kN, mass 1520 g. Grease limiting speed 1900 rpm. The industry-neutral page spelling 61926-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61926", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61926-llu", "6926llu" ], "locale_variants": {}, "dynamic_load_kN": 72, "static_load_kN": 67.5, "load_derived": true, "manufacturer_designation": "NTN 6926LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 1900 }, { "sku": "61928-2RS", "brand": "NTN", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6928LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61928-2RS runs slower and cooler-limited than the open 61928; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61928-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "NTN catalogues the contact-sealed version as 6928LLU (suffix LU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 74/71.5 kN load ratings, 3.7 kN fatigue load limit Cu and 1620 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6928LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61928-2RS bearing?", "a": "A 61928-2RS deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61928-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61928-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6928LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LU), 140×190×24 mm per ISO 15. Quoted values: C 74 kN, C0 71.5 kN, Cu 3.7 kN, mass 1620 g. Grease limiting speed 1800 rpm. The industry-neutral page spelling 61928-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "61928", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61928-llu", "6928llu" ], "locale_variants": {}, "dynamic_load_kN": 74, "static_load_kN": 71.5, "load_derived": true, "manufacturer_designation": "NTN 6928LLU", "material": "GCr15", "fatigue_load_limit_kN": 3.7, "limiting_speed_rpm": 1800 }, { "sku": "6230-2RS", "brand": "NTN", "manufacturer_designation": "NTN 6230LLU", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 168, "fatigue_load_limit_kN": 9.05, "limiting_speed_rpm": 1500, "weight_g": 9410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NTN's contact-seal catalogue number is 6230LLU, mapped here from the industry-neutral -2RS spelling (LLH is the low-torque contact-seal variant).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6230-2RS runs slower and cooler-limited than the open 6230; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6230-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "NTN catalogues the contact-sealed version as 6230LLU (suffix LLU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "The 195/168 kN load ratings, 9.05 kN fatigue load limit Cu and 9410 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6230LLU; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6230-2RS bearing?", "a": "A 6230-2RS deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6230-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the NTN designation and catalogue data for 6230-2RS?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6230LLU — two contacting rubber seals over a lifetime grease fill (NTN suffix LLU), 150×270×45 mm per ISO 15. Quoted values: C 195 kN, C0 168 kN, Cu 9.05 kN, mass 9410 g. Grease limiting speed 1500 rpm. The industry-neutral page spelling 6230-2RS follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO-INTERCHANGE", "level": "verify", "note": "ISO 15 envelope interchange; NTN suffix LLU maps to industry-neutral 2RS. Verify seal design, grease and speed rating per brand catalogue." } ], "aliases": [ "6230-llu", "6230llu" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=9", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16044", "brand": "NTN", "manufacturer_designation": "NTN 16044", "series": "16000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 200, "static_load_kN": 216, "fatigue_load_limit_kN": 8.65, "limiting_speed_rpm": 1800, "weight_g": 11300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 220 mm bore shares the 340 mm outside diameter of the 6044 but is only 37 mm wide; a 6044 in a 37 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16044 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×340×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16044 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16044.", "The open 16044 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 200/216 kN load ratings, 8.65 kN fatigue load limit Cu and 11300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16044; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16044 bearing?", "a": "A 16044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 37 mm width (8.661 × 13.386 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16044 bore code work?", "a": "The last two digits of 16044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16044 mean?", "a": "A bare 16044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 220 mm bore?", "a": "160 is the narrow extra-light section: 340×37 mm with a 60.0 mm radial section at 220 mm bore. It has the same bore and outside diameter as the 6044 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16044?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16044 — the open (unsealed) execution, 220×340×37 mm per ISO 15. Quoted values: C 200 kN, C0 216 kN, Cu 8.65 kN, mass 11300 g. Grease limiting speed 1800 rpm. The industry-neutral page spelling 16044 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16044", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16048", "brand": "NTN", "manufacturer_designation": "NTN 16048", "series": "16000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 197, "static_load_kN": 217, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 1700, "weight_g": 12100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 240 mm bore shares the 360 mm outside diameter of the 6048 but is only 37 mm wide; a 6048 in a 37 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16048 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16048 units.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16048 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 197/217 kN load ratings, 8.3 kN fatigue load limit Cu and 12100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16048; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16048 bearing?", "a": "A 16048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 37 mm width (9.449 × 14.173 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16048 bore code work?", "a": "The last two digits of 16048 are bore code 48, giving 48 × 5 = 240 mm bore. The 360 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16048 mean?", "a": "A bare 16048 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 240 mm bore?", "a": "160 is the narrow extra-light section: 360×37 mm with a 60.0 mm radial section at 240 mm bore. It has the same bore and outside diameter as the 6048 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16048?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16048 — the open (unsealed) execution, 240×360×37 mm per ISO 15. Quoted values: C 197 kN, C0 217 kN, Cu 8.3 kN, mass 12100 g. Grease limiting speed 1700 rpm. The industry-neutral page spelling 16048 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16048", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16052", "brand": "NTN", "manufacturer_designation": "NTN 16052", "series": "16000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 252, "static_load_kN": 299, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1500, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 260 mm bore shares the 400 mm outside diameter of the 6052 but is only 44 mm wide; a 6052 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16052 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16052-C3. No clearance suffix means normal CN clearance.", "The open 16052 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 252/299 kN load ratings, 11.1 kN fatigue load limit Cu and 18500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16052; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16052 bearing?", "a": "A 16052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 44 mm width (10.236 × 15.748 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16052 bore code work?", "a": "The last two digits of 16052 are bore code 52, giving 52 × 5 = 260 mm bore. The 400 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16052 mean?", "a": "A bare 16052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 260 mm bore?", "a": "160 is the narrow extra-light section: 400×44 mm with a 70.0 mm radial section at 260 mm bore. It has the same bore and outside diameter as the 6052 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16052?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16052 — the open (unsealed) execution, 260×400×44 mm per ISO 15. Quoted values: C 252 kN, C0 299 kN, Cu 11.1 kN, mass 18500 g. Grease limiting speed 1500 rpm. The industry-neutral page spelling 16052 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16052", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=10", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16056", "brand": "NTN", "manufacturer_designation": "NTN 16056", "series": "16000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 44, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 257, "static_load_kN": 315, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 1400, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 44 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 280 mm bore shares the 420 mm outside diameter of the 6056 but is only 44 mm wide; a 6056 in a 44 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×44 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16056 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16056.", "The open 16056 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 257/315 kN load ratings, 11.3 kN fatigue load limit Cu and 23000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16056; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16056 bearing?", "a": "A 16056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 44 mm width (11.024 × 16.535 × 1.732 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16056 bore code work?", "a": "The last two digits of 16056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 44 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16056 mean?", "a": "A bare 16056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 280 mm bore?", "a": "160 is the narrow extra-light section: 420×44 mm with a 70.0 mm radial section at 280 mm bore. It has the same bore and outside diameter as the 6056 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16056?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16056 — the open (unsealed) execution, 280×420×44 mm per ISO 15. Quoted values: C 257 kN, C0 315 kN, Cu 11.3 kN, mass 23000 g. Grease limiting speed 1400 rpm. The industry-neutral page spelling 16056 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16056", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16060", "brand": "NTN", "manufacturer_designation": "NTN 16060", "series": "16000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 410, "fatigue_load_limit_kN": 14.5, "limiting_speed_rpm": 1300, "weight_g": 32500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 300 mm bore shares the 460 mm outside diameter of the 6060 but is only 50 mm wide; a 6060 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16060 units.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 325/410 kN load ratings, 14.5 kN fatigue load limit Cu and 32500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16060; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16060 bearing?", "a": "A 16060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 50 mm width (11.811 × 18.11 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16060 bore code work?", "a": "The last two digits of 16060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16060 mean?", "a": "A bare 16060 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 300 mm bore?", "a": "160 is the narrow extra-light section: 460×50 mm with a 80.0 mm radial section at 300 mm bore. It has the same bore and outside diameter as the 6060 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16060?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16060 — the open (unsealed) execution, 300×460×50 mm per ISO 15. Quoted values: C 325 kN, C0 410 kN, Cu 14.5 kN, mass 32500 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 16060 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16060", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6060", "brand": "NTN", "manufacturer_designation": "NTN 6060", "series": "6000-series", "type": "deep_groove", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 395, "static_load_kN": 480, "fatigue_load_limit_kN": 18.4, "limiting_speed_rpm": 1300, "weight_g": 43800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6060 carries bore code 60 = 300 mm. Outside diameter 460 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 300 mm bore uses a smaller 460 mm OD than a 6260; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6060 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×460×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6060 units.", "Shaft and housing fillets must clear the bearing chamfer so the 74 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6060 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 395/480 kN load ratings, 18.4 kN fatigue load limit Cu and 43800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6060; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6060 bearing?", "a": "A 6060 deep-groove ball bearing has a 300 mm bore, 460 mm outer diameter and 74 mm width (11.811 × 18.11 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6060 bore code work?", "a": "The last two digits of 6060 are bore code 60, giving 60 × 5 = 300 mm bore. The 460 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6060 mean?", "a": "A bare 6060 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 300 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (460×74 mm, 80.0 mm radial section) at 300 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6060?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6060 — the open (unsealed) execution, 300×460×74 mm per ISO 15. Quoted values: C 395 kN, C0 480 kN, Cu 18.4 kN, mass 43800 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 6060 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6060", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61964", "brand": "NTN", "manufacturer_designation": "NTN 6964", "series": "61900-series", "type": "deep_groove", "d_mm": 320, "D_mm": 440, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 315, "static_load_kN": 405, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 1300, "weight_g": 24800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61964 carries bore code 64 = 320 mm. Outside diameter 440 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 320 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61964 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×440×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61964 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61964 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 315/405 kN load ratings, 14.1 kN fatigue load limit Cu and 24800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6964; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61964 bearing?", "a": "A 61964 deep-groove ball bearing has a 320 mm bore, 440 mm outer diameter and 56 mm width (12.598 × 17.323 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61964 bore code work?", "a": "The last two digits of 61964 are bore code 64, giving 64 × 5 = 320 mm bore. The 440 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61964 mean?", "a": "A bare 61964 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 320 mm bore?", "a": "619 is a thin section one step above 618: 440×56 mm with a 60.0 mm radial section at 320 mm bore; a 6264 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61964?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6964 — the open (unsealed) execution, 320×440×56 mm per ISO 15. Quoted values: C 315 kN, C0 405 kN, Cu 14.1 kN, mass 24800 g. Grease limiting speed 1300 rpm. The industry-neutral page spelling 61964 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61964", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6964" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16064", "brand": "NTN", "manufacturer_designation": "NTN 16064", "series": "16000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 335, "static_load_kN": 440, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 1200, "weight_g": 34200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16064 carries bore code 64 = 320 mm. Outside diameter 480 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 320 mm bore shares the 480 mm outside diameter of the 6064 but is only 50 mm wide; a 6064 in a 50 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16064 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16064-C3. No clearance suffix means normal CN clearance.", "The open 16064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 335/440 kN load ratings, 14.9 kN fatigue load limit Cu and 34200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16064; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16064 bearing?", "a": "A 16064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 50 mm width (12.598 × 18.898 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16064 bore code work?", "a": "The last two digits of 16064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16064 mean?", "a": "A bare 16064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 320 mm bore?", "a": "160 is the narrow extra-light section: 480×50 mm with a 80.0 mm radial section at 320 mm bore. It has the same bore and outside diameter as the 6064 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16064?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16064 — the open (unsealed) execution, 320×480×50 mm per ISO 15. Quoted values: C 335 kN, C0 440 kN, Cu 14.9 kN, mass 34200 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 16064 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16064", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6064", "brand": "NTN", "manufacturer_designation": "NTN 6064", "series": "6000-series", "type": "deep_groove", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 410, "static_load_kN": 530, "fatigue_load_limit_kN": 19.3, "limiting_speed_rpm": 1200, "weight_g": 46100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6064 carries bore code 64 = 320 mm. Outside diameter 480 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 320 mm bore uses a smaller 480 mm OD than a 6264; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6064 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×480×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6064 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6064-C3. No clearance suffix means normal CN clearance.", "The open 6064 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 410/530 kN load ratings, 19.3 kN fatigue load limit Cu and 46100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6064; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6064 bearing?", "a": "A 6064 deep-groove ball bearing has a 320 mm bore, 480 mm outer diameter and 74 mm width (12.598 × 18.898 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6064 bore code work?", "a": "The last two digits of 6064 are bore code 64, giving 64 × 5 = 320 mm bore. The 480 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6064 mean?", "a": "A bare 6064 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 320 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (480×74 mm, 80.0 mm radial section) at 320 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6064?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6064 — the open (unsealed) execution, 320×480×74 mm per ISO 15. Quoted values: C 410 kN, C0 530 kN, Cu 19.3 kN, mass 46100 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 6064 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6064", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61968", "brand": "NTN", "manufacturer_designation": "NTN 6968", "series": "61900-series", "type": "deep_groove", "d_mm": 340, "D_mm": 460, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 430, "fatigue_load_limit_kN": 14.4, "limiting_speed_rpm": 1200, "weight_g": 26200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61968 carries bore code 68 = 340 mm. Outside diameter 460 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 340 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61968 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×460×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61968 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61968 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 325/430 kN load ratings, 14.4 kN fatigue load limit Cu and 26200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6968; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61968 bearing?", "a": "A 61968 deep-groove ball bearing has a 340 mm bore, 460 mm outer diameter and 56 mm width (13.386 × 18.11 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61968 bore code work?", "a": "The last two digits of 61968 are bore code 68, giving 68 × 5 = 340 mm bore. The 460 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61968 mean?", "a": "A bare 61968 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 340 mm bore?", "a": "619 is a thin section one step above 618: 460×56 mm with a 60.0 mm radial section at 340 mm bore; a 6268 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61968?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6968 — the open (unsealed) execution, 340×460×56 mm per ISO 15. Quoted values: C 325 kN, C0 430 kN, Cu 14.4 kN, mass 26200 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 61968 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61968", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6968" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16068", "brand": "NTN", "manufacturer_designation": "NTN 16068", "series": "16000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 515, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1100, "weight_g": 47100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16068 carries bore code 68 = 340 mm. Outside diameter 520 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 340 mm bore shares the 520 mm outside diameter of the 6068 but is only 57 mm wide; a 6068 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16068 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16068.", "The open 16068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380/515 kN load ratings, 17 kN fatigue load limit Cu and 47100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16068; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16068 bearing?", "a": "A 16068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 57 mm width (13.386 × 20.472 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16068 bore code work?", "a": "The last two digits of 16068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 57 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16068 mean?", "a": "A bare 16068 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 340 mm bore?", "a": "160 is the narrow extra-light section: 520×57 mm with a 90.0 mm radial section at 340 mm bore. It has the same bore and outside diameter as the 6068 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16068?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16068 — the open (unsealed) execution, 340×520×57 mm per ISO 15. Quoted values: C 380 kN, C0 515 kN, Cu 17 kN, mass 47100 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 16068 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16068", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6068", "brand": "NTN", "manufacturer_designation": "NTN 6068", "series": "6000-series", "type": "deep_groove", "d_mm": 340, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 465, "static_load_kN": 610, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 1100, "weight_g": 61800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6068 carries bore code 68 = 340 mm. Outside diameter 520 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 340 mm bore uses a smaller 520 mm OD than a 6268; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6068 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×520×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6068 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 520 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6068.", "The open 6068 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 465/610 kN load ratings, 21.9 kN fatigue load limit Cu and 61800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6068; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6068 bearing?", "a": "A 6068 deep-groove ball bearing has a 340 mm bore, 520 mm outer diameter and 82 mm width (13.386 × 20.472 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6068 bore code work?", "a": "The last two digits of 6068 are bore code 68, giving 68 × 5 = 340 mm bore. The 520 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6068 mean?", "a": "A bare 6068 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 340 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (520×82 mm, 90.0 mm radial section) at 340 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6068?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6068 — the open (unsealed) execution, 340×520×82 mm per ISO 15. Quoted values: C 465 kN, C0 610 kN, Cu 21.9 kN, mass 61800 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 6068 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6068", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61872", "brand": "NTN", "manufacturer_designation": "NTN 6872", "series": "61800-series", "type": "deep_groove", "d_mm": 360, "D_mm": 440, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 207, "static_load_kN": 258, "fatigue_load_limit_kN": 8.55, "limiting_speed_rpm": 1200, "weight_g": 12300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61872 carries bore code 72 = 360 mm. Outside diameter 440 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 360 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6272.", "The open 61872 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×440×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61872 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61872-C3. No clearance suffix means normal CN clearance.", "The open 61872 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 207/258 kN load ratings, 8.55 kN fatigue load limit Cu and 12300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6872; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61872 bearing?", "a": "A 61872 deep-groove ball bearing has a 360 mm bore, 440 mm outer diameter and 38 mm width (14.173 × 17.323 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61872 bore code work?", "a": "The last two digits of 61872 are bore code 72, giving 72 × 5 = 360 mm bore. The 440 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61872 mean?", "a": "A bare 61872 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 360 mm bore?", "a": "618 is an extra-thin section: 440×38 mm, only 40.0 mm radial section at 360 mm bore, far smaller than a 6272, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61872?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6872 — the open (unsealed) execution, 360×440×38 mm per ISO 15. Quoted values: C 207 kN, C0 258 kN, Cu 8.55 kN, mass 12300 g. Grease limiting speed 1200 rpm. The industry-neutral page spelling 61872 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61872", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6872" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61972", "brand": "NTN", "manufacturer_designation": "NTN 6972", "series": "61900-series", "type": "deep_groove", "d_mm": 360, "D_mm": 480, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 330, "static_load_kN": 455, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 1100, "weight_g": 27500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61972 carries bore code 72 = 360 mm. Outside diameter 480 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 360 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61972 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×480×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61972 units.", "A 360 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61972 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 330/455 kN load ratings, 14.8 kN fatigue load limit Cu and 27500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6972; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61972 bearing?", "a": "A 61972 deep-groove ball bearing has a 360 mm bore, 480 mm outer diameter and 56 mm width (14.173 × 18.898 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61972 bore code work?", "a": "The last two digits of 61972 are bore code 72, giving 72 × 5 = 360 mm bore. The 480 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61972 mean?", "a": "A bare 61972 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 360 mm bore?", "a": "619 is a thin section one step above 618: 480×56 mm with a 60.0 mm radial section at 360 mm bore; a 6272 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61972?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6972 — the open (unsealed) execution, 360×480×56 mm per ISO 15. Quoted values: C 330 kN, C0 455 kN, Cu 14.8 kN, mass 27500 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61972 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61972", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6972" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "16072", "brand": "NTN", "manufacturer_designation": "NTN 16072", "series": "16000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 57, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 390, "static_load_kN": 550, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 1100, "weight_g": 49300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 57 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 160xx narrow section at 360 mm bore shares the 540 mm outside diameter of the 6072 but is only 57 mm wide; a 6072 in a 57 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×57 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16072 units.", "Shaft and housing fillets must clear the bearing chamfer so the 57 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 390/550 kN load ratings, 17.6 kN fatigue load limit Cu and 49300 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 16072; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 16072 bearing?", "a": "A 16072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 57 mm width (14.173 × 21.26 × 2.244 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 16072 bore code work?", "a": "The last two digits of 16072 are bore code 72, giving 72 × 5 = 360 mm bore. The 540 mm outside diameter and 57 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 16072 mean?", "a": "A bare 16072 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 16000 compare with other series at the same 360 mm bore?", "a": "160 is the narrow extra-light section: 540×57 mm with a 90.0 mm radial section at 360 mm bore. It has the same bore and outside diameter as the 6072 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site." }, { "q": "What is the NTN designation and catalogue data for 16072?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 16072 — the open (unsealed) execution, 360×540×57 mm per ISO 15. Quoted values: C 390 kN, C0 550 kN, Cu 17.6 kN, mass 49300 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 16072 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "16072", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6072", "brand": "NTN", "manufacturer_designation": "NTN 6072", "series": "6000-series", "type": "deep_groove", "d_mm": 360, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 485, "static_load_kN": 670, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 1100, "weight_g": 64700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6072 carries bore code 72 = 360 mm. Outside diameter 540 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 360 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 360 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 360 mm bore uses a smaller 540 mm OD than a 6272; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6072 has no lubricant retention: grease escapes and contaminants migrate straight into the 360×540×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6072 units.", "Shaft and housing fillets must clear the bearing chamfer so the 82 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6072 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 485/670 kN load ratings, 23 kN fatigue load limit Cu and 64700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6072; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6072 bearing?", "a": "A 6072 deep-groove ball bearing has a 360 mm bore, 540 mm outer diameter and 82 mm width (14.173 × 21.26 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6072 bore code work?", "a": "The last two digits of 6072 are bore code 72, giving 72 × 5 = 360 mm bore. The 540 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6072 mean?", "a": "A bare 6072 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 360 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (540×82 mm, 90.0 mm radial section) at 360 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6072?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6072 — the open (unsealed) execution, 360×540×82 mm per ISO 15. Quoted values: C 485 kN, C0 670 kN, Cu 23 kN, mass 64700 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 6072 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6072", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61876", "brand": "NTN", "manufacturer_designation": "NTN 6876", "series": "61800-series", "type": "deep_groove", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 256, "static_load_kN": 340, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1100, "weight_g": 19700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61876 carries bore code 76 = 380 mm. Outside diameter 480 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 380 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6276.", "The open 61876 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×480×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61876 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 480 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61876.", "The open 61876 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 256/340 kN load ratings, 10.8 kN fatigue load limit Cu and 19700 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6876; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61876 bearing?", "a": "A 61876 deep-groove ball bearing has a 380 mm bore, 480 mm outer diameter and 46 mm width (14.961 × 18.898 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61876 bore code work?", "a": "The last two digits of 61876 are bore code 76, giving 76 × 5 = 380 mm bore. The 480 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61876 mean?", "a": "A bare 61876 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 380 mm bore?", "a": "618 is an extra-thin section: 480×46 mm, only 50.0 mm radial section at 380 mm bore, far smaller than a 6276, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61876?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6876 — the open (unsealed) execution, 380×480×46 mm per ISO 15. Quoted values: C 256 kN, C0 340 kN, Cu 10.8 kN, mass 19700 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61876 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61876", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6876" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61976", "brand": "NTN", "manufacturer_designation": "NTN 6976", "series": "61900-series", "type": "deep_groove", "d_mm": 380, "D_mm": 520, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 360, "static_load_kN": 510, "fatigue_load_limit_kN": 15.9, "limiting_speed_rpm": 1100, "weight_g": 39800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61976 carries bore code 76 = 380 mm. Outside diameter 520 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 380 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61976 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×520×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61976 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61976 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 360/510 kN load ratings, 15.9 kN fatigue load limit Cu and 39800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6976; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61976 bearing?", "a": "A 61976 deep-groove ball bearing has a 380 mm bore, 520 mm outer diameter and 65 mm width (14.961 × 20.472 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61976 bore code work?", "a": "The last two digits of 61976 are bore code 76, giving 76 × 5 = 380 mm bore. The 520 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61976 mean?", "a": "A bare 61976 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 380 mm bore?", "a": "619 is a thin section one step above 618: 520×65 mm with a 70.0 mm radial section at 380 mm bore; a 6276 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61976?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6976 — the open (unsealed) execution, 380×520×65 mm per ISO 15. Quoted values: C 360 kN, C0 510 kN, Cu 15.9 kN, mass 39800 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61976 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61976", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6976" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6076", "brand": "NTN", "manufacturer_designation": "NTN 6076", "series": "6000-series", "type": "deep_groove", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 505, "static_load_kN": 725, "fatigue_load_limit_kN": 24.1, "limiting_speed_rpm": 990, "weight_g": 67500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6076 carries bore code 76 = 380 mm. Outside diameter 560 mm and width 82 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 380 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 380 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 380 mm bore uses a smaller 560 mm OD than a 6276; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6076 has no lubricant retention: grease escapes and contaminants migrate straight into the 380×560×82 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6076 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6076-C3. No clearance suffix means normal CN clearance.", "The open 6076 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 505/725 kN load ratings, 24.1 kN fatigue load limit Cu and 67500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6076; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6076 bearing?", "a": "A 6076 deep-groove ball bearing has a 380 mm bore, 560 mm outer diameter and 82 mm width (14.961 × 22.047 × 3.228 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6076 bore code work?", "a": "The last two digits of 6076 are bore code 76, giving 76 × 5 = 380 mm bore. The 560 mm outside diameter and 82 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6076 mean?", "a": "A bare 6076 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 380 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (560×82 mm, 90.0 mm radial section) at 380 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6076?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6076 — the open (unsealed) execution, 380×560×82 mm per ISO 15. Quoted values: C 505 kN, C0 725 kN, Cu 24.1 kN, mass 67500 g. Grease limiting speed 990 rpm. The industry-neutral page spelling 6076 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6076", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61880", "brand": "NTN", "manufacturer_designation": "NTN 6880", "series": "61800-series", "type": "deep_groove", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 251, "static_load_kN": 340, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 1100, "weight_g": 20600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61880 carries bore code 80 = 400 mm. Outside diameter 500 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 400 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6280.", "The open 61880 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×500×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61880 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61880 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 251/340 kN load ratings, 10.6 kN fatigue load limit Cu and 20600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6880; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61880 bearing?", "a": "A 61880 deep-groove ball bearing has a 400 mm bore, 500 mm outer diameter and 46 mm width (15.748 × 19.685 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61880 bore code work?", "a": "The last two digits of 61880 are bore code 80, giving 80 × 5 = 400 mm bore. The 500 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61880 mean?", "a": "A bare 61880 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 400 mm bore?", "a": "618 is an extra-thin section: 500×46 mm, only 50.0 mm radial section at 400 mm bore, far smaller than a 6280, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61880?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6880 — the open (unsealed) execution, 400×500×46 mm per ISO 15. Quoted values: C 251 kN, C0 340 kN, Cu 10.6 kN, mass 20600 g. Grease limiting speed 1100 rpm. The industry-neutral page spelling 61880 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61880", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6880" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61980", "brand": "NTN", "manufacturer_designation": "NTN 6980", "series": "61900-series", "type": "deep_groove", "d_mm": 400, "D_mm": 540, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 370, "static_load_kN": 535, "fatigue_load_limit_kN": 16.4, "limiting_speed_rpm": 990, "weight_g": 41600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61980 carries bore code 80 = 400 mm. Outside diameter 540 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 400 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61980 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×540×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61980 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61980 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 370/535 kN load ratings, 16.4 kN fatigue load limit Cu and 41600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6980; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61980 bearing?", "a": "A 61980 deep-groove ball bearing has a 400 mm bore, 540 mm outer diameter and 65 mm width (15.748 × 21.26 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61980 bore code work?", "a": "The last two digits of 61980 are bore code 80, giving 80 × 5 = 400 mm bore. The 540 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61980 mean?", "a": "A bare 61980 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 400 mm bore?", "a": "619 is a thin section one step above 618: 540×65 mm with a 70.0 mm radial section at 400 mm bore; a 6280 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61980?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6980 — the open (unsealed) execution, 400×540×65 mm per ISO 15. Quoted values: C 370 kN, C0 535 kN, Cu 16.4 kN, mass 41600 g. Grease limiting speed 990 rpm. The industry-neutral page spelling 61980 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61980", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6980" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6080", "brand": "NTN", "manufacturer_designation": "NTN 6080", "series": "6000-series", "type": "deep_groove", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 565, "static_load_kN": 825, "fatigue_load_limit_kN": 26.9, "limiting_speed_rpm": 930, "weight_g": 87600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6080 carries bore code 80 = 400 mm. Outside diameter 600 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 400 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 400 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 400 mm bore uses a smaller 600 mm OD than a 6280; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6080 has no lubricant retention: grease escapes and contaminants migrate straight into the 400×600×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6080 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 600 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6080.", "The open 6080 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 565/825 kN load ratings, 26.9 kN fatigue load limit Cu and 87600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6080; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6080 bearing?", "a": "A 6080 deep-groove ball bearing has a 400 mm bore, 600 mm outer diameter and 90 mm width (15.748 × 23.622 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6080 bore code work?", "a": "The last two digits of 6080 are bore code 80, giving 80 × 5 = 400 mm bore. The 600 mm outside diameter and 90 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6080 mean?", "a": "A bare 6080 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 400 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (600×90 mm, 100.0 mm radial section) at 400 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6080?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6080 — the open (unsealed) execution, 400×600×90 mm per ISO 15. Quoted values: C 565 kN, C0 825 kN, Cu 26.9 kN, mass 87600 g. Grease limiting speed 930 rpm. The industry-neutral page spelling 6080 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6080", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61884", "brand": "NTN", "manufacturer_designation": "NTN 6884", "series": "61800-series", "type": "deep_groove", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 288, "static_load_kN": 405, "fatigue_load_limit_kN": 12.4, "limiting_speed_rpm": 1000, "weight_g": 21600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61884 carries bore code 84 = 420 mm. Outside diameter 520 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 420 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6284.", "The open 61884 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×520×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61884 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61884-C3. No clearance suffix means normal CN clearance.", "The open 61884 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 288/405 kN load ratings, 12.4 kN fatigue load limit Cu and 21600 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6884; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61884 bearing?", "a": "A 61884 deep-groove ball bearing has a 420 mm bore, 520 mm outer diameter and 46 mm width (16.535 × 20.472 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61884 bore code work?", "a": "The last two digits of 61884 are bore code 84, giving 84 × 5 = 420 mm bore. The 520 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61884 mean?", "a": "A bare 61884 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 420 mm bore?", "a": "618 is an extra-thin section: 520×46 mm, only 50.0 mm radial section at 420 mm bore, far smaller than a 6284, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61884?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6884 — the open (unsealed) execution, 420×520×46 mm per ISO 15. Quoted values: C 288 kN, C0 405 kN, Cu 12.4 kN, mass 21600 g. Grease limiting speed 1000 rpm. The industry-neutral page spelling 61884 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61884", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6884" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61984", "brand": "NTN", "manufacturer_designation": "NTN 6984", "series": "61900-series", "type": "deep_groove", "d_mm": 420, "D_mm": 560, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 380, "static_load_kN": 560, "fatigue_load_limit_kN": 16.8, "limiting_speed_rpm": 940, "weight_g": 43400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61984 carries bore code 84 = 420 mm. Outside diameter 560 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (70.0 mm section height at 420 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61984 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×560×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61984 units.", "A 420 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61984 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 380/560 kN load ratings, 16.8 kN fatigue load limit Cu and 43400 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6984; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61984 bearing?", "a": "A 61984 deep-groove ball bearing has a 420 mm bore, 560 mm outer diameter and 65 mm width (16.535 × 22.047 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61984 bore code work?", "a": "The last two digits of 61984 are bore code 84, giving 84 × 5 = 420 mm bore. The 560 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61984 mean?", "a": "A bare 61984 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 420 mm bore?", "a": "619 is a thin section one step above 618: 560×65 mm with a 70.0 mm radial section at 420 mm bore; a 6284 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61984?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6984 — the open (unsealed) execution, 420×560×65 mm per ISO 15. Quoted values: C 380 kN, C0 560 kN, Cu 16.8 kN, mass 43400 g. Grease limiting speed 940 rpm. The industry-neutral page spelling 61984 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61984", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6984" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "6084", "brand": "NTN", "manufacturer_designation": "NTN 6084", "series": "6000-series", "type": "deep_groove", "d_mm": 420, "D_mm": 620, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 590, "static_load_kN": 895, "fatigue_load_limit_kN": 28.3, "limiting_speed_rpm": 880, "weight_g": 91100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6084 carries bore code 84 = 420 mm. Outside diameter 620 mm and width 90 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 420 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 420 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 420 mm bore uses a smaller 620 mm OD than a 6284; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6084 has no lubricant retention: grease escapes and contaminants migrate straight into the 420×620×90 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6084 units.", "Shaft and housing fillets must clear the bearing chamfer so the 90 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6084 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 590/895 kN load ratings, 28.3 kN fatigue load limit Cu and 91100 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6084; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 6084 bearing?", "a": "A 6084 deep-groove ball bearing has a 420 mm bore, 620 mm outer diameter and 90 mm width (16.535 × 24.409 × 3.543 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6084 bore code work?", "a": "The last two digits of 6084 are bore code 84, giving 84 × 5 = 420 mm bore. The 620 mm outside diameter and 90 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6084 mean?", "a": "A bare 6084 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 420 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (620×90 mm, 100.0 mm radial section) at 420 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the NTN designation and catalogue data for 6084?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6084 — the open (unsealed) execution, 420×620×90 mm per ISO 15. Quoted values: C 590 kN, C0 895 kN, Cu 28.3 kN, mass 91100 g. Grease limiting speed 880 rpm. The industry-neutral page spelling 6084 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "6084", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61888", "brand": "NTN", "manufacturer_designation": "NTN 6888", "series": "61800-series", "type": "deep_groove", "d_mm": 440, "D_mm": 540, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 292, "static_load_kN": 420, "fatigue_load_limit_kN": 12.6, "limiting_speed_rpm": 950, "weight_g": 22500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61888 carries bore code 88 = 440 mm. Outside diameter 540 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 440 mm bore has only a 50.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6288.", "The open 61888 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×540×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61888 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 540 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61888.", "The open 61888 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 292/420 kN load ratings, 12.6 kN fatigue load limit Cu and 22500 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6888; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61888 bearing?", "a": "A 61888 deep-groove ball bearing has a 440 mm bore, 540 mm outer diameter and 46 mm width (17.323 × 21.26 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61888 bore code work?", "a": "The last two digits of 61888 are bore code 88, giving 88 × 5 = 440 mm bore. The 540 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61888 mean?", "a": "A bare 61888 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 440 mm bore?", "a": "618 is an extra-thin section: 540×46 mm, only 50.0 mm radial section at 440 mm bore, far smaller than a 6288, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61888?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6888 — the open (unsealed) execution, 440×540×46 mm per ISO 15. Quoted values: C 292 kN, C0 420 kN, Cu 12.6 kN, mass 22500 g. Grease limiting speed 950 rpm. The industry-neutral page spelling 61888 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61888", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6888" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61988", "brand": "NTN", "manufacturer_designation": "NTN 6988", "series": "61900-series", "type": "deep_groove", "d_mm": 440, "D_mm": 600, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 405, "static_load_kN": 615, "fatigue_load_limit_kN": 18, "limiting_speed_rpm": 890, "weight_g": 60000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61988 carries bore code 88 = 440 mm. Outside diameter 600 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 440 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 440 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 440 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61988 has no lubricant retention: grease escapes and contaminants migrate straight into the 440×600×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61988 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61988 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 405/615 kN load ratings, 18 kN fatigue load limit Cu and 60000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6988; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61988 bearing?", "a": "A 61988 deep-groove ball bearing has a 440 mm bore, 600 mm outer diameter and 74 mm width (17.323 × 23.622 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61988 bore code work?", "a": "The last two digits of 61988 are bore code 88, giving 88 × 5 = 440 mm bore. The 600 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61988 mean?", "a": "A bare 61988 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 440 mm bore?", "a": "619 is a thin section one step above 618: 600×74 mm with a 80.0 mm radial section at 440 mm bore; a 6288 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61988?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6988 — the open (unsealed) execution, 440×600×74 mm per ISO 15. Quoted values: C 405 kN, C0 615 kN, Cu 18 kN, mass 60000 g. Grease limiting speed 890 rpm. The industry-neutral page spelling 61988 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61988", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6988" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=11", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61892", "brand": "NTN", "manufacturer_designation": "NTN 6892", "series": "61800-series", "type": "deep_groove", "d_mm": 460, "D_mm": 580, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 350, "static_load_kN": 515, "fatigue_load_limit_kN": 15.1, "limiting_speed_rpm": 900, "weight_g": 34800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61892 carries bore code 92 = 460 mm. Outside diameter 580 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 460 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 460 mm bore has only a 60.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6292.", "The open 61892 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×580×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61892 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61892 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 350/515 kN load ratings, 15.1 kN fatigue load limit Cu and 34800 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6892; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61892 bearing?", "a": "A 61892 deep-groove ball bearing has a 460 mm bore, 580 mm outer diameter and 56 mm width (18.11 × 22.835 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61892 bore code work?", "a": "The last two digits of 61892 are bore code 92, giving 92 × 5 = 460 mm bore. The 580 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61892 mean?", "a": "A bare 61892 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 460 mm bore?", "a": "618 is an extra-thin section: 580×56 mm, only 60.0 mm radial section at 460 mm bore, far smaller than a 6292, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61892?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6892 — the open (unsealed) execution, 460×580×56 mm per ISO 15. Quoted values: C 350 kN, C0 515 kN, Cu 15.1 kN, mass 34800 g. Grease limiting speed 900 rpm. The industry-neutral page spelling 61892 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61892", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6892" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61992", "brand": "NTN", "manufacturer_designation": "NTN 6992", "series": "61900-series", "type": "deep_groove", "d_mm": 460, "D_mm": 620, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 645, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 850, "weight_g": 62200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61992 carries bore code 92 = 460 mm. Outside diameter 620 mm and width 74 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 460 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 460 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (80.0 mm section height at 460 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61992 has no lubricant retention: grease escapes and contaminants migrate straight into the 460×620×74 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61992 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61992 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 415/645 kN load ratings, 18.5 kN fatigue load limit Cu and 62200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6992; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61992 bearing?", "a": "A 61992 deep-groove ball bearing has a 460 mm bore, 620 mm outer diameter and 74 mm width (18.11 × 24.409 × 2.913 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61992 bore code work?", "a": "The last two digits of 61992 are bore code 92, giving 92 × 5 = 460 mm bore. The 620 mm outside diameter and 74 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61992 mean?", "a": "A bare 61992 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 460 mm bore?", "a": "619 is a thin section one step above 618: 620×74 mm with a 80.0 mm radial section at 460 mm bore; a 6292 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61992?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6992 — the open (unsealed) execution, 460×620×74 mm per ISO 15. Quoted values: C 415 kN, C0 645 kN, Cu 18.5 kN, mass 62200 g. Grease limiting speed 850 rpm. The industry-neutral page spelling 61992 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61992", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6992" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61896", "brand": "NTN", "manufacturer_designation": "NTN 6896", "series": "61800-series", "type": "deep_groove", "d_mm": 480, "D_mm": 600, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 355, "static_load_kN": 540, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 860, "weight_g": 36200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61896 carries bore code 96 = 480 mm. Outside diameter 600 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 480 mm bore has only a 60.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6296.", "The open 61896 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×600×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61896 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61896-C3. No clearance suffix means normal CN clearance.", "The open 61896 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 355/540 kN load ratings, 15.4 kN fatigue load limit Cu and 36200 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6896; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61896 bearing?", "a": "A 61896 deep-groove ball bearing has a 480 mm bore, 600 mm outer diameter and 56 mm width (18.898 × 23.622 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61896 bore code work?", "a": "The last two digits of 61896 are bore code 96, giving 96 × 5 = 480 mm bore. The 600 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61896 mean?", "a": "A bare 61896 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 480 mm bore?", "a": "618 is an extra-thin section: 600×56 mm, only 60.0 mm radial section at 480 mm bore, far smaller than a 6296, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the NTN designation and catalogue data for 61896?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6896 — the open (unsealed) execution, 480×600×56 mm per ISO 15. Quoted values: C 355 kN, C0 540 kN, Cu 15.4 kN, mass 36200 g. Grease limiting speed 860 rpm. The industry-neutral page spelling 61896 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61896", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6896" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "61996", "brand": "NTN", "manufacturer_designation": "NTN 6996", "series": "61900-series", "type": "deep_groove", "d_mm": 480, "D_mm": 650, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 480, "static_load_kN": 770, "fatigue_load_limit_kN": 21.5, "limiting_speed_rpm": 810, "weight_g": 73000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61996 carries bore code 96 = 480 mm. Outside diameter 650 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 480 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NTN catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (shields), LLB/LLF (non-contact seals), LLH (low-torque contact seal) and LLU (contact seal).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 480 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (85.0 mm section height at 480 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61996 has no lubricant retention: grease escapes and contaminants migrate straight into the 480×650×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61996 units.", "A 480 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61996 has no integral sealing; in the NTN 2203 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), LLB/LLF (non-contact rubber seals), LLU (contact rubber seals) and LLH (a low-torque contact seal with higher speed capability than LLU). A JR or JRX suffix (as printed for some thin-section sizes) denotes a pressed-steel cage, not a seal.", "The 480/770 kN load ratings, 21.5 kN fatigue load limit Cu and 73000 g mass here are NTN Ball and Roller Bearings CAT.No.2203-3/E figures for 6996; this seal/size combination has no counterpart from another catalogue on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive." ], "faq": [ { "q": "What are the dimensions of a 61996 bearing?", "a": "A 61996 deep-groove ball bearing has a 480 mm bore, 650 mm outer diameter and 78 mm width (18.898 × 25.591 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61996 bore code work?", "a": "The last two digits of 61996 are bore code 96, giving 96 × 5 = 480 mm bore. The 650 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61996 mean?", "a": "A bare 61996 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 480 mm bore?", "a": "619 is a thin section one step above 618: 650×78 mm with a 85.0 mm radial section at 480 mm bore; a 6296 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the NTN designation and catalogue data for 61996?", "a": "In the NTN Ball and Roller Bearings catalogue (CAT.No.2203-3/E, 2024) this size is listed as 6996 — the open (unsealed) execution, 480×650×78 mm per ISO 15. Quoted values: C 480 kN, C0 770 kN, Cu 21.5 kN, mass 73000 g. Grease limiting speed 810 rpm. The industry-neutral page spelling 61996 follows the seal-suffix convention used across this site, not NTN order-number spelling." } ], "cross_ref": [ { "equiv_sku": "61996", "equiv_brand": "ISO-INTERCHANGE", "level": "full", "note": "ISO 15 boundary-dimension interchange; ratings above are NTN 2203-3/E values and differ by brand — verify per supplier." } ], "aliases": [ "6996" ], "locale_variants": {}, "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/2203E_b02.pdf#page=12", "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203-3/E (2024)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published" }, { "sku": "1200", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 5.55, "static_load_kN": 1.19, "fatigue_load_limit_kN": 0.049, "limiting_speed_rpm": 22000, "speed_oil_rpm": 28000, "weight_g": 34, "manufacturer_designation": "1200S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1200S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small electric motor and fan shafts", "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 12xx light section at 10 mm bore uses a smaller 30 mm OD than a 1300; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1200 units.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1200 self-aligning ball bearing?", "a": "A 1200 self-aligning ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1200?", "a": "A bare 1200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 10 mm bore?", "a": "The 12xx is the light section: 30×9 mm with a 10.0 mm radial section at 10 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2200", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 10, "D_mm": 30, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 7.45, "static_load_kN": 1.59, "fatigue_load_limit_kN": 0.067, "limiting_speed_rpm": 24000, "speed_oil_rpm": 28000, "weight_g": 46, "manufacturer_designation": "2200S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2200S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "garden equipment and light machinery", "instrument and office machine drives", "small electric motor and fan shafts", "domestic appliance drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 22xx wide-section at 10 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1200.", "The open 2200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2200 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2200." ], "faq": [ { "q": "What are the dimensions of a 2200 self-aligning ball bearing?", "a": "A 2200 self-aligning ball bearing has a 10 mm bore, 30 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2200?", "a": "A bare 2200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 10 mm bore?", "a": "The 22xx is the wide light section: 30×14 mm with a 10.0 mm radial section at 10 mm bore, wider than a 1200 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1300", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 7.35, "static_load_kN": 1.62, "fatigue_load_limit_kN": 0.074, "limiting_speed_rpm": 20000, "speed_oil_rpm": 24000, "weight_g": 59, "manufacturer_designation": "1300S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1300S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 13xx medium section at 10 mm bore gains rating through a larger 35 mm OD and 11 mm width; verify the housing accepts the larger envelope before substituting for a 1200.", "The open 1300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1300 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1300." ], "faq": [ { "q": "What are the dimensions of a 1300 self-aligning ball bearing?", "a": "A 1300 self-aligning ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1300?", "a": "A bare 1300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 10 mm bore?", "a": "The 13xx is the medium section: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 1200 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2300", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 10, "D_mm": 35, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 9.2, "static_load_kN": 2.01, "fatigue_load_limit_kN": 0.096, "limiting_speed_rpm": 18000, "speed_oil_rpm": 22000, "weight_g": 78, "manufacturer_designation": "2300S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2300S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small electric motor and fan shafts", "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 23xx heavy wide-section at 10 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2300 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2300 self-aligning ball bearing?", "a": "A 2300 self-aligning ball bearing has a 10 mm bore, 35 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2300?", "a": "A bare 2300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 10 mm bore?", "a": "The 23xx is the wide heavy section: 35×17 mm, 12.5 mm radial section at 10 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1201", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 5.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.053, "limiting_speed_rpm": 22000, "speed_oil_rpm": 26000, "weight_g": 41, "manufacturer_designation": "1201S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1201S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 12xx light section at 12 mm bore uses a smaller 32 mm OD than a 1301; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1201 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1201." ], "faq": [ { "q": "What are the dimensions of a 1201 self-aligning ball bearing?", "a": "A 1201 self-aligning ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1201?", "a": "A bare 1201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 12 mm bore?", "a": "The 12xx is the light section: 32×10 mm with a 10.0 mm radial section at 12 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2201", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 12, "D_mm": 32, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 7.75, "static_load_kN": 1.73, "fatigue_load_limit_kN": 0.089, "limiting_speed_rpm": 22000, "speed_oil_rpm": 26000, "weight_g": 51, "manufacturer_designation": "2201S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2201S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "instrument and office machine drives", "small electric motor and fan shafts", "domestic appliance drive shafts", "power tool spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 22xx wide-section at 12 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1201.", "The open 2201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2201 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2201 self-aligning ball bearing?", "a": "A 2201 self-aligning ball bearing has a 12 mm bore, 32 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2201?", "a": "A bare 2201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 12 mm bore?", "a": "The 22xx is the wide light section: 32×14 mm with a 10.0 mm radial section at 12 mm bore, wider than a 1201 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1301", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 9.65, "static_load_kN": 2.16, "fatigue_load_limit_kN": 0.078, "limiting_speed_rpm": 18000, "speed_oil_rpm": 22000, "weight_g": 68, "manufacturer_designation": "1301S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1301S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives", "small electric motor and fan shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 13xx medium section at 12 mm bore gains rating through a larger 37 mm OD and 12 mm width; verify the housing accepts the larger envelope before substituting for a 1201.", "The open 1301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1301 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1301." ], "faq": [ { "q": "What are the dimensions of a 1301 self-aligning ball bearing?", "a": "A 1301 self-aligning ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1301?", "a": "A bare 1301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 12 mm bore?", "a": "The 13xx is the medium section: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 1201 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2301", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 12, "D_mm": 37, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 12.1, "static_load_kN": 2.73, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 17000, "speed_oil_rpm": 22000, "weight_g": 87, "manufacturer_designation": "2301S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2301S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 23xx heavy wide-section at 12 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2301 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2301-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2301 self-aligning ball bearing?", "a": "A 2301 self-aligning ball bearing has a 12 mm bore, 37 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2301?", "a": "A bare 2301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 12 mm bore?", "a": "The 23xx is the wide heavy section: 37×17 mm, 12.5 mm radial section at 12 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1202", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 7.6, "static_load_kN": 1.75, "fatigue_load_limit_kN": 0.072, "limiting_speed_rpm": 18000, "speed_oil_rpm": 22000, "weight_g": 50, "manufacturer_designation": "1202S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1202S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 12xx light section at 15 mm bore uses a smaller 35 mm OD than a 1302; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1202 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1202." ], "faq": [ { "q": "What are the dimensions of a 1202 self-aligning ball bearing?", "a": "A 1202 self-aligning ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1202?", "a": "A bare 1202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 15 mm bore?", "a": "The 12xx is the light section: 35×11 mm with a 10.0 mm radial section at 15 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2202", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 15, "D_mm": 35, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 7.8, "static_load_kN": 1.85, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 18000, "speed_oil_rpm": 22000, "weight_g": 58, "manufacturer_designation": "2202S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2202S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small electric motor and fan shafts", "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 22xx wide-section at 15 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1202.", "The open 2202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2202 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2202-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2202 self-aligning ball bearing?", "a": "A 2202 self-aligning ball bearing has a 15 mm bore, 35 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2202?", "a": "A bare 2202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 15 mm bore?", "a": "The 22xx is the wide light section: 35×14 mm with a 10.0 mm radial section at 15 mm bore, wider than a 1202 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1302", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "dynamic_load_kN": 9.7, "static_load_kN": 2.29, "fatigue_load_limit_kN": 0.081, "limiting_speed_rpm": 16000, "speed_oil_rpm": 20000, "weight_g": 101, "manufacturer_designation": "1302S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1302S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "garden equipment and light machinery", "instrument and office machine drives", "small electric motor and fan shafts", "domestic appliance drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 13xx medium section at 15 mm bore gains rating through a larger 42 mm OD and 13 mm width; verify the housing accepts the larger envelope before substituting for a 1202.", "The open 1302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1302 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1302 self-aligning ball bearing?", "a": "A 1302 self-aligning ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1302?", "a": "A bare 1302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 15 mm bore?", "a": "The 13xx is the medium section: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 1202 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2302", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 15, "D_mm": 42, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 12.3, "static_load_kN": 2.91, "fatigue_load_limit_kN": 0.13, "limiting_speed_rpm": 14000, "speed_oil_rpm": 18000, "weight_g": 113, "manufacturer_designation": "2302S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2302S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 23xx heavy wide-section at 15 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2302 units.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2302 self-aligning ball bearing?", "a": "A 2302 self-aligning ball bearing has a 15 mm bore, 42 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2302?", "a": "A bare 2302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 15 mm bore?", "a": "The 23xx is the wide heavy section: 42×17 mm, 13.5 mm radial section at 15 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1203", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 8, "static_load_kN": 2.01, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 16000, "speed_oil_rpm": 20000, "weight_g": 74, "manufacturer_designation": "1203S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1203S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives", "small electric motor and fan shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 12xx light section at 17 mm bore uses a smaller 40 mm OD than a 1303; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1203 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1203 self-aligning ball bearing?", "a": "A 1203 self-aligning ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1203?", "a": "A bare 1203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 17 mm bore?", "a": "The 12xx is the light section: 40×12 mm with an 11.5 mm radial section at 17 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2203", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 17, "D_mm": 40, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 9.95, "static_load_kN": 2.42, "fatigue_load_limit_kN": 0.13, "limiting_speed_rpm": 16000, "speed_oil_rpm": 20000, "weight_g": 89, "manufacturer_designation": "2203S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2203S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 16 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "domestic appliance drive shafts", "power tool spindles", "small pump impeller shafts", "garden equipment and light machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 22xx wide-section at 17 mm bore adds load capacity through increased 16 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1203.", "The open 2203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2203 units.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2203 self-aligning ball bearing?", "a": "A 2203 self-aligning ball bearing has a 17 mm bore, 40 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2203?", "a": "A bare 2203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 17 mm bore?", "a": "The 22xx is the wide light section: 40×16 mm with an 11.5 mm radial section at 17 mm bore, wider than a 1203 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1303", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 12.7, "static_load_kN": 3.2, "fatigue_load_limit_kN": 0.11, "limiting_speed_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 130, "manufacturer_designation": "1303S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1303S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "instrument and office machine drives", "small electric motor and fan shafts", "domestic appliance drive shafts", "power tool spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 1303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 13xx medium section at 17 mm bore gains rating through a larger 47 mm OD and 14 mm width; verify the housing accepts the larger envelope before substituting for a 1203.", "The open 1303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1303 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1303-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1303 self-aligning ball bearing?", "a": "A 1303 self-aligning ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 1303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 1303?", "a": "A bare 1303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 17 mm bore?", "a": "The 13xx is the medium section: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 1203 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2303", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 17, "D_mm": 47, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 14.7, "static_load_kN": 3.55, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "speed_oil_rpm": 16000, "weight_g": 160, "manufacturer_designation": "2303S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2303S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small pump impeller shafts", "garden equipment and light machinery", "instrument and office machine drives", "small electric motor and fan shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 2303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 23xx heavy wide-section at 17 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2303 units.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2303 self-aligning ball bearing?", "a": "A 2303 self-aligning ball bearing has a 17 mm bore, 47 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "Why does 2303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the open suffix mean on 2303?", "a": "A bare 2303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 17 mm bore?", "a": "The 23xx is the wide heavy section: 47×19 mm, 15.0 mm radial section at 17 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1204", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 10, "static_load_kN": 2.61, "fatigue_load_limit_kN": 0.11, "limiting_speed_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 120, "manufacturer_designation": "1204S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1204S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 20 mm bore uses a smaller 47 mm OD than a 1304; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1204 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1204-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1204 self-aligning ball bearing?", "a": "A 1204 self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1204 bore code work?", "a": "The last two digits of 1204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1204?", "a": "A bare 1204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 20 mm bore?", "a": "The 12xx is the light section: 47×14 mm with a 13.5 mm radial section at 20 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1204K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 10, "static_load_kN": 2.61, "fatigue_load_limit_kN": 0.11, "limiting_speed_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 120, "manufacturer_designation": "1204SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1204SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1204. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1204K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 20 mm bore uses a smaller 47 mm OD than a 1304; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1204K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1204K self-aligning ball bearing?", "a": "A 1204K self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1204." }, { "q": "How does the 1204 bore code work?", "a": "The last two digits of 1204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1204K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1204. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 20 mm bore?", "a": "The 12xx is the light section: 47×14 mm with a 13.5 mm radial section at 20 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2204", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 47, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 12.8, "static_load_kN": 3.3, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 142, "manufacturer_designation": "2204S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2204S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 20 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1204.", "The open 2204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2204 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2204 self-aligning ball bearing?", "a": "A 2204 self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2204 bore code work?", "a": "The last two digits of 2204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2204?", "a": "A bare 2204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 20 mm bore?", "a": "The 22xx is the wide light section: 47×18 mm with a 13.5 mm radial section at 20 mm bore, wider than a 1204 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2204K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 47, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 12.8, "static_load_kN": 3.3, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 14000, "speed_oil_rpm": 17000, "weight_g": 142, "manufacturer_designation": "2204SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2204SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2204. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2204K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 20 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1204.", "Tapered-bore 2204K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2204K." ], "faq": [ { "q": "What are the dimensions of a 2204K self-aligning ball bearing?", "a": "A 2204K self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2204." }, { "q": "How does the 2204 bore code work?", "a": "The last two digits of 2204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2204K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2204. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 20 mm bore?", "a": "The 22xx is the wide light section: 47×18 mm with a 13.5 mm radial section at 20 mm bore, wider than a 1204 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1304", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 12.6, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 164, "manufacturer_designation": "1304S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1304S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 20 mm bore gains rating through a larger 52 mm OD and 15 mm width; verify the housing accepts the larger envelope before substituting for a 1204.", "The open 1304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1304 units.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1304 self-aligning ball bearing?", "a": "A 1304 self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1304 bore code work?", "a": "The last two digits of 1304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1304?", "a": "A bare 1304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 20 mm bore?", "a": "The 13xx is the medium section: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 1204 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1304K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 12.6, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 12000, "speed_oil_rpm": 15000, "weight_g": 164, "manufacturer_designation": "1304SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1304SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1304. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1304K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 20 mm bore gains rating through a larger 52 mm OD and 15 mm width; verify the housing accepts the larger envelope before substituting for a 1204.", "Tapered-bore 1304K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1304K." ], "faq": [ { "q": "What are the dimensions of a 1304K self-aligning ball bearing?", "a": "A 1304K self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1304." }, { "q": "How does the 1304 bore code work?", "a": "The last two digits of 1304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1304K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1304. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 20 mm bore?", "a": "The 13xx is the medium section: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 1204 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2304", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 52, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 18.5, "static_load_kN": 4.7, "fatigue_load_limit_kN": 0.21, "limiting_speed_rpm": 11000, "speed_oil_rpm": 14000, "weight_g": 207, "manufacturer_designation": "2304S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2304S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 20 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2304 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2304." ], "faq": [ { "q": "What are the dimensions of a 2304 self-aligning ball bearing?", "a": "A 2304 self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2304 bore code work?", "a": "The last two digits of 2304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2304?", "a": "A bare 2304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 20 mm bore?", "a": "The 23xx is the wide heavy section: 52×21 mm, 16.0 mm radial section at 20 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2304K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 20, "D_mm": 52, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 18.5, "static_load_kN": 4.7, "fatigue_load_limit_kN": 0.21, "limiting_speed_rpm": 11000, "speed_oil_rpm": 14000, "weight_g": 207, "manufacturer_designation": "2304SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2304SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2304. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2304K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 20 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2304K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2304K self-aligning ball bearing?", "a": "A 2304K self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2304." }, { "q": "How does the 2304 bore code work?", "a": "The last two digits of 2304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2304K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2304. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 20 mm bore?", "a": "The 23xx is the wide heavy section: 52×21 mm, 16.0 mm radial section at 20 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1205", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 12.2, "static_load_kN": 3.3, "fatigue_load_limit_kN": 0.13, "limiting_speed_rpm": 12000, "speed_oil_rpm": 14000, "weight_g": 140, "manufacturer_designation": "1205S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1205S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 25 mm bore uses a smaller 52 mm OD than a 1305; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1205 units.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1205 self-aligning ball bearing?", "a": "A 1205 self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1205 bore code work?", "a": "The last two digits of 1205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1205?", "a": "A bare 1205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 25 mm bore?", "a": "The 12xx is the light section: 52×15 mm with a 13.5 mm radial section at 25 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1205K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 12.2, "static_load_kN": 3.3, "fatigue_load_limit_kN": 0.13, "limiting_speed_rpm": 12000, "speed_oil_rpm": 14000, "weight_g": 140, "manufacturer_designation": "1205SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1205SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1205. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1205K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 25 mm bore uses a smaller 52 mm OD than a 1305; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1205K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1205K." ], "faq": [ { "q": "What are the dimensions of a 1205K self-aligning ball bearing?", "a": "A 1205K self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1205." }, { "q": "How does the 1205 bore code work?", "a": "The last two digits of 1205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1205K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1205. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 25 mm bore?", "a": "The 12xx is the light section: 52×15 mm with a 13.5 mm radial section at 25 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2205", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 52, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 12.4, "static_load_kN": 3.45, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "speed_oil_rpm": 14000, "weight_g": 160, "manufacturer_designation": "2205S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2205S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 25 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1205.", "The open 2205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2205 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2205." ], "faq": [ { "q": "What are the dimensions of a 2205 self-aligning ball bearing?", "a": "A 2205 self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2205 bore code work?", "a": "The last two digits of 2205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2205?", "a": "A bare 2205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 25 mm bore?", "a": "The 22xx is the wide light section: 52×18 mm with a 13.5 mm radial section at 25 mm bore, wider than a 1205 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2205K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 52, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 12.4, "static_load_kN": 3.45, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "speed_oil_rpm": 14000, "weight_g": 160, "manufacturer_designation": "2205SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2205SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2205. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2205K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 25 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1205.", "Tapered-bore 2205K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2205K self-aligning ball bearing?", "a": "A 2205K self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2205." }, { "q": "How does the 2205 bore code work?", "a": "The last two digits of 2205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2205K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2205. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 25 mm bore?", "a": "The 22xx is the wide light section: 52×18 mm with a 13.5 mm radial section at 25 mm bore, wider than a 1205 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1305", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 18.2, "static_load_kN": 5, "fatigue_load_limit_kN": 0.15, "limiting_speed_rpm": 10000, "speed_oil_rpm": 13000, "weight_g": 261, "manufacturer_designation": "1305S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1305S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 25 mm bore gains rating through a larger 62 mm OD and 17 mm width; verify the housing accepts the larger envelope before substituting for a 1205.", "The open 1305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1305 units.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1305 self-aligning ball bearing?", "a": "A 1305 self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1305 bore code work?", "a": "The last two digits of 1305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1305?", "a": "A bare 1305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 25 mm bore?", "a": "The 13xx is the medium section: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 1205 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1305K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 18.2, "static_load_kN": 5, "fatigue_load_limit_kN": 0.15, "limiting_speed_rpm": 10000, "speed_oil_rpm": 13000, "weight_g": 261, "manufacturer_designation": "1305SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1305SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1305. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1305K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 25 mm bore gains rating through a larger 62 mm OD and 17 mm width; verify the housing accepts the larger envelope before substituting for a 1205.", "Tapered-bore 1305K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1305K." ], "faq": [ { "q": "What are the dimensions of a 1305K self-aligning ball bearing?", "a": "A 1305K self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1305." }, { "q": "How does the 1305 bore code work?", "a": "The last two digits of 1305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1305K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1305. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 25 mm bore?", "a": "The 13xx is the medium section: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 1205 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2305", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 62, "B_mm": 24, "seal_type": "open", "dynamic_load_kN": 24.9, "static_load_kN": 6.6, "fatigue_load_limit_kN": 0.29, "limiting_speed_rpm": 9500, "speed_oil_rpm": 12000, "weight_g": 332, "manufacturer_designation": "2305S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2305S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 24 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 25 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2305 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2305." ], "faq": [ { "q": "What are the dimensions of a 2305 self-aligning ball bearing?", "a": "A 2305 self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2305 bore code work?", "a": "The last two digits of 2305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2305?", "a": "A bare 2305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 25 mm bore?", "a": "The 23xx is the wide heavy section: 62×24 mm, 18.5 mm radial section at 25 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2305K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 25, "D_mm": 62, "B_mm": 24, "seal_type": "open", "dynamic_load_kN": 24.9, "static_load_kN": 6.6, "fatigue_load_limit_kN": 0.29, "limiting_speed_rpm": 9500, "speed_oil_rpm": 12000, "weight_g": 332, "manufacturer_designation": "2305SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2305SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 24 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2305. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2305K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 25 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2305K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2305-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2305K self-aligning ball bearing?", "a": "A 2305K self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2305." }, { "q": "How does the 2305 bore code work?", "a": "The last two digits of 2305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2305K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2305. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 25 mm bore?", "a": "The 23xx is the wide heavy section: 62×24 mm, 18.5 mm radial section at 25 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1206", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 15.8, "static_load_kN": 4.65, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 10000, "speed_oil_rpm": 12000, "weight_g": 220, "manufacturer_designation": "1206S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1206S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 30 mm bore uses a smaller 62 mm OD than a 1306; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1206 units.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1206 self-aligning ball bearing?", "a": "A 1206 self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1206 bore code work?", "a": "The last two digits of 1206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1206?", "a": "A bare 1206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 30 mm bore?", "a": "The 12xx is the light section: 62×16 mm with a 16.0 mm radial section at 30 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1206K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 15.8, "static_load_kN": 4.65, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 10000, "speed_oil_rpm": 12000, "weight_g": 220, "manufacturer_designation": "1206SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1206SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1206. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1206K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 30 mm bore uses a smaller 62 mm OD than a 1306; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1206K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1206K." ], "faq": [ { "q": "What are the dimensions of a 1206K self-aligning ball bearing?", "a": "A 1206K self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1206." }, { "q": "How does the 1206 bore code work?", "a": "The last two digits of 1206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1206K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1206. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 30 mm bore?", "a": "The 12xx is the light section: 62×16 mm with a 16.0 mm radial section at 30 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2206", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 62, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 15.3, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 10000, "speed_oil_rpm": 12000, "weight_g": 262, "manufacturer_designation": "2206S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2206S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 20 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 30 mm bore adds load capacity through increased 20 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1206.", "The open 2206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2206 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2206." ], "faq": [ { "q": "What are the dimensions of a 2206 self-aligning ball bearing?", "a": "A 2206 self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2206 bore code work?", "a": "The last two digits of 2206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2206?", "a": "A bare 2206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 30 mm bore?", "a": "The 22xx is the wide light section: 62×20 mm with a 16.0 mm radial section at 30 mm bore, wider than a 1206 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2206K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 62, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 15.3, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 10000, "speed_oil_rpm": 12000, "weight_g": 262, "manufacturer_designation": "2206SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2206SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 20 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2206. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2206K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 30 mm bore adds load capacity through increased 20 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1206.", "Tapered-bore 2206K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2206-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2206K self-aligning ball bearing?", "a": "A 2206K self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2206." }, { "q": "How does the 2206 bore code work?", "a": "The last two digits of 2206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2206K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2206. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 30 mm bore?", "a": "The 22xx is the wide light section: 62×20 mm with a 16.0 mm radial section at 30 mm bore, wider than a 1206 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1306", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 21.4, "static_load_kN": 6.3, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 8500, "speed_oil_rpm": 11000, "weight_g": 391, "manufacturer_designation": "1306S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1306S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 30 mm bore gains rating through a larger 72 mm OD and 19 mm width; verify the housing accepts the larger envelope before substituting for a 1206.", "The open 1306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1306 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1306." ], "faq": [ { "q": "What are the dimensions of a 1306 self-aligning ball bearing?", "a": "A 1306 self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1306 bore code work?", "a": "The last two digits of 1306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1306?", "a": "A bare 1306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 30 mm bore?", "a": "The 13xx is the medium section: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 1206 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1306K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 21.4, "static_load_kN": 6.3, "fatigue_load_limit_kN": 0.19, "limiting_speed_rpm": 8500, "speed_oil_rpm": 11000, "weight_g": 391, "manufacturer_designation": "1306SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1306SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1306. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1306K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 30 mm bore gains rating through a larger 72 mm OD and 19 mm width; verify the housing accepts the larger envelope before substituting for a 1206.", "Tapered-bore 1306K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1306K self-aligning ball bearing?", "a": "A 1306K self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1306." }, { "q": "How does the 1306 bore code work?", "a": "The last two digits of 1306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1306K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1306. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 30 mm bore?", "a": "The 13xx is the medium section: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 1206 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2306", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 72, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 32, "static_load_kN": 8.75, "fatigue_load_limit_kN": 0.38, "limiting_speed_rpm": 8000, "speed_oil_rpm": 10000, "weight_g": 500, "manufacturer_designation": "2306S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2306S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 27 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 30 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2306 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2306 self-aligning ball bearing?", "a": "A 2306 self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2306 bore code work?", "a": "The last two digits of 2306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2306?", "a": "A bare 2306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 30 mm bore?", "a": "The 23xx is the wide heavy section: 72×27 mm, 21.0 mm radial section at 30 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2306K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 30, "D_mm": 72, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 32, "static_load_kN": 8.75, "fatigue_load_limit_kN": 0.38, "limiting_speed_rpm": 8000, "speed_oil_rpm": 10000, "weight_g": 500, "manufacturer_designation": "2306SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2306SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 27 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2306. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2306K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 30 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2306K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2306K self-aligning ball bearing?", "a": "A 2306K self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2306." }, { "q": "How does the 2306 bore code work?", "a": "The last two digits of 2306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2306K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2306. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 30 mm bore?", "a": "The 23xx is the wide heavy section: 72×27 mm, 21.0 mm radial section at 30 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1207", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 15.9, "static_load_kN": 5.1, "fatigue_load_limit_kN": 0.21, "limiting_speed_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 330, "manufacturer_designation": "1207S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1207S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 35 mm bore uses a smaller 72 mm OD than a 1307; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1207 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1207." ], "faq": [ { "q": "What are the dimensions of a 1207 self-aligning ball bearing?", "a": "A 1207 self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1207 bore code work?", "a": "The last two digits of 1207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1207?", "a": "A bare 1207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 35 mm bore?", "a": "The 12xx is the light section: 72×17 mm with an 18.5 mm radial section at 35 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1207K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 15.9, "static_load_kN": 5.1, "fatigue_load_limit_kN": 0.21, "limiting_speed_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 330, "manufacturer_designation": "1207SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1207SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1207. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1207K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 35 mm bore uses a smaller 72 mm OD than a 1307; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1207K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1207K self-aligning ball bearing?", "a": "A 1207K self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1207." }, { "q": "How does the 1207 bore code work?", "a": "The last two digits of 1207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1207K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1207. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 35 mm bore?", "a": "The 12xx is the light section: 72×17 mm with an 18.5 mm radial section at 35 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2207", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 72, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 21.7, "static_load_kN": 6.6, "fatigue_load_limit_kN": 0.32, "limiting_speed_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 403, "manufacturer_designation": "2207S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2207S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 35 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1207.", "The open 2207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2207 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2207 self-aligning ball bearing?", "a": "A 2207 self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2207 bore code work?", "a": "The last two digits of 2207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2207?", "a": "A bare 2207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 35 mm bore?", "a": "The 22xx is the wide light section: 72×23 mm with an 18.5 mm radial section at 35 mm bore, wider than a 1207 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2207K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 72, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 21.7, "static_load_kN": 6.6, "fatigue_load_limit_kN": 0.32, "limiting_speed_rpm": 8500, "speed_oil_rpm": 10000, "weight_g": 403, "manufacturer_designation": "2207SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2207SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2207. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2207K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 35 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1207.", "Tapered-bore 2207K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2207K self-aligning ball bearing?", "a": "A 2207K self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2207." }, { "q": "How does the 2207 bore code work?", "a": "The last two digits of 2207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2207K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2207. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 35 mm bore?", "a": "The 22xx is the wide light section: 72×23 mm with an 18.5 mm radial section at 35 mm bore, wider than a 1207 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1307", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 25.3, "static_load_kN": 7.85, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9500, "weight_g": 520, "manufacturer_designation": "1307S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1307S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 35 mm bore gains rating through a larger 80 mm OD and 21 mm width; verify the housing accepts the larger envelope before substituting for a 1207.", "The open 1307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1307 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1307." ], "faq": [ { "q": "What are the dimensions of a 1307 self-aligning ball bearing?", "a": "A 1307 self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1307 bore code work?", "a": "The last two digits of 1307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1307?", "a": "A bare 1307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 35 mm bore?", "a": "The 13xx is the medium section: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 1207 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1307K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 25.3, "static_load_kN": 7.85, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9500, "weight_g": 520, "manufacturer_designation": "1307SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1307SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1307. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1307K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 35 mm bore gains rating through a larger 80 mm OD and 21 mm width; verify the housing accepts the larger envelope before substituting for a 1207.", "Tapered-bore 1307K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1307-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1307K self-aligning ball bearing?", "a": "A 1307K self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1307." }, { "q": "How does the 1307 bore code work?", "a": "The last two digits of 1307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1307K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1307. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 35 mm bore?", "a": "The 13xx is the medium section: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 1207 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2307", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 80, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 40, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.48, "limiting_speed_rpm": 7100, "speed_oil_rpm": 9000, "weight_g": 671, "manufacturer_designation": "2307S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2307S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 35 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2307 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2307-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2307 self-aligning ball bearing?", "a": "A 2307 self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2307 bore code work?", "a": "The last two digits of 2307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2307?", "a": "A bare 2307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 35 mm bore?", "a": "The 23xx is the wide heavy section: 80×31 mm, 22.5 mm radial section at 35 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2307K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 35, "D_mm": 80, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 40, "static_load_kN": 11.3, "fatigue_load_limit_kN": 0.48, "limiting_speed_rpm": 7100, "speed_oil_rpm": 9000, "weight_g": 671, "manufacturer_designation": "2307SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2307SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2307. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2307K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 35 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2307K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2307K self-aligning ball bearing?", "a": "A 2307K self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2307." }, { "q": "How does the 2307 bore code work?", "a": "The last two digits of 2307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2307K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2307. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 35 mm bore?", "a": "The 23xx is the wide heavy section: 80×31 mm, 22.5 mm radial section at 35 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1208", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 19.3, "static_load_kN": 6.5, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9000, "weight_g": 420, "manufacturer_designation": "1208S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1208S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 40 mm bore uses a smaller 80 mm OD than a 1308; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1208 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1208." ], "faq": [ { "q": "What are the dimensions of a 1208 self-aligning ball bearing?", "a": "A 1208 self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1208 bore code work?", "a": "The last two digits of 1208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1208?", "a": "A bare 1208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 40 mm bore?", "a": "The 12xx is the light section: 80×18 mm with a 20.0 mm radial section at 40 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1208K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 19.3, "static_load_kN": 6.5, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9000, "weight_g": 420, "manufacturer_designation": "1208SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1208SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1208. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1208K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 40 mm bore uses a smaller 80 mm OD than a 1308; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1208K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1208-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1208K self-aligning ball bearing?", "a": "A 1208K self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1208." }, { "q": "How does the 1208 bore code work?", "a": "The last two digits of 1208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1208K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1208. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 40 mm bore?", "a": "The 12xx is the light section: 80×18 mm with a 20.0 mm radial section at 40 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2208", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 80, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 22.4, "static_load_kN": 7.35, "fatigue_load_limit_kN": 0.39, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9000, "weight_g": 506, "manufacturer_designation": "2208S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2208S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 40 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1208.", "The open 2208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2208 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2208-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2208 self-aligning ball bearing?", "a": "A 2208 self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2208 bore code work?", "a": "The last two digits of 2208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2208?", "a": "A bare 2208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 40 mm bore?", "a": "The 22xx is the wide light section: 80×23 mm with a 20.0 mm radial section at 40 mm bore, wider than a 1208 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2208K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 80, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 22.4, "static_load_kN": 7.35, "fatigue_load_limit_kN": 0.39, "limiting_speed_rpm": 7500, "speed_oil_rpm": 9000, "weight_g": 506, "manufacturer_designation": "2208SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2208SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2208. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2208K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 40 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1208.", "Tapered-bore 2208K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2208K self-aligning ball bearing?", "a": "A 2208K self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2208." }, { "q": "How does the 2208 bore code work?", "a": "The last two digits of 2208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2208K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2208. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 40 mm bore?", "a": "The 22xx is the wide light section: 80×23 mm with a 20.0 mm radial section at 40 mm bore, wider than a 1208 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1308", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 29.8, "static_load_kN": 9.7, "fatigue_load_limit_kN": 0.3, "limiting_speed_rpm": 6700, "speed_oil_rpm": 8500, "weight_g": 727, "manufacturer_designation": "1308S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1308S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 40 mm bore gains rating through a larger 90 mm OD and 23 mm width; verify the housing accepts the larger envelope before substituting for a 1208.", "The open 1308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1308 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1308 self-aligning ball bearing?", "a": "A 1308 self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1308 bore code work?", "a": "The last two digits of 1308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1308?", "a": "A bare 1308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 40 mm bore?", "a": "The 13xx is the medium section: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 1208 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1308K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 29.8, "static_load_kN": 9.7, "fatigue_load_limit_kN": 0.3, "limiting_speed_rpm": 6700, "speed_oil_rpm": 8500, "weight_g": 727, "manufacturer_designation": "1308SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1308SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1308. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1308K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 40 mm bore gains rating through a larger 90 mm OD and 23 mm width; verify the housing accepts the larger envelope before substituting for a 1208.", "Tapered-bore 1308K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1308K self-aligning ball bearing?", "a": "A 1308K self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1308." }, { "q": "How does the 1308 bore code work?", "a": "The last two digits of 1308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1308K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1308. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 40 mm bore?", "a": "The 13xx is the medium section: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 1208 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2308", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 90, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 45.5, "static_load_kN": 13.5, "fatigue_load_limit_kN": 0.58, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 918, "manufacturer_designation": "2308S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2308S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 40 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2308 units.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2308 self-aligning ball bearing?", "a": "A 2308 self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2308 bore code work?", "a": "The last two digits of 2308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2308?", "a": "A bare 2308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 40 mm bore?", "a": "The 23xx is the wide heavy section: 90×33 mm, 25.0 mm radial section at 40 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2308K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 40, "D_mm": 90, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 45.5, "static_load_kN": 13.5, "fatigue_load_limit_kN": 0.58, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 918, "manufacturer_designation": "2308SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2308SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2308. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2308K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 40 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2308K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2308K." ], "faq": [ { "q": "What are the dimensions of a 2308K self-aligning ball bearing?", "a": "A 2308K self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2308." }, { "q": "How does the 2308 bore code work?", "a": "The last two digits of 2308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2308K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2308. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 40 mm bore?", "a": "The 23xx is the wide heavy section: 90×33 mm, 25.0 mm radial section at 40 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1209", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 22, "static_load_kN": 7.35, "fatigue_load_limit_kN": 0.29, "limiting_speed_rpm": 7100, "speed_oil_rpm": 8500, "weight_g": 470, "manufacturer_designation": "1209S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1209S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 45 mm bore uses a smaller 85 mm OD than a 1309; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1209 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1209 self-aligning ball bearing?", "a": "A 1209 self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1209 bore code work?", "a": "The last two digits of 1209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1209?", "a": "A bare 1209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 45 mm bore?", "a": "The 12xx is the light section: 85×19 mm with a 20.0 mm radial section at 45 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1209K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 22, "static_load_kN": 7.35, "fatigue_load_limit_kN": 0.29, "limiting_speed_rpm": 7100, "speed_oil_rpm": 8500, "weight_g": 470, "manufacturer_designation": "1209SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1209SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1209. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1209K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 12xx light section at 45 mm bore uses a smaller 85 mm OD than a 1309; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1209K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1209K self-aligning ball bearing?", "a": "A 1209K self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1209." }, { "q": "How does the 1209 bore code work?", "a": "The last two digits of 1209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1209K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1209. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 45 mm bore?", "a": "The 12xx is the light section: 85×19 mm with a 20.0 mm radial section at 45 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2209", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 85, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 23.3, "static_load_kN": 8.15, "fatigue_load_limit_kN": 0.51, "limiting_speed_rpm": 7100, "speed_oil_rpm": 8500, "weight_g": 556, "manufacturer_designation": "2209S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2209S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 45 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1209.", "The open 2209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2209 units.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2209 self-aligning ball bearing?", "a": "A 2209 self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2209 bore code work?", "a": "The last two digits of 2209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2209?", "a": "A bare 2209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 45 mm bore?", "a": "The 22xx is the wide light section: 85×23 mm with a 20.0 mm radial section at 45 mm bore, wider than a 1209 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2209K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 85, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 23.3, "static_load_kN": 8.15, "fatigue_load_limit_kN": 0.51, "limiting_speed_rpm": 7100, "speed_oil_rpm": 8500, "weight_g": 556, "manufacturer_designation": "2209SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2209SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2209. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "small gearbox input/output shafts", "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2209K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 22xx wide-section at 45 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1209.", "Tapered-bore 2209K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2209K." ], "faq": [ { "q": "What are the dimensions of a 2209K self-aligning ball bearing?", "a": "A 2209K self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2209." }, { "q": "How does the 2209 bore code work?", "a": "The last two digits of 2209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2209K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2209. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 45 mm bore?", "a": "The 22xx is the wide light section: 85×23 mm with a 20.0 mm radial section at 45 mm bore, wider than a 1209 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1309", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 38.5, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7500, "weight_g": 971, "manufacturer_designation": "1309S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1309S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 45 mm bore gains rating through a larger 100 mm OD and 25 mm width; verify the housing accepts the larger envelope before substituting for a 1209.", "The open 1309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1309 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1309-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1309 self-aligning ball bearing?", "a": "A 1309 self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1309 bore code work?", "a": "The last two digits of 1309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1309?", "a": "A bare 1309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 45 mm bore?", "a": "The 13xx is the medium section: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 1209 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1309K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 38.5, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7500, "weight_g": 971, "manufacturer_designation": "1309SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1309SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1309. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "electric motors and generators", "centrifugal pump shafts", "small gearbox input/output shafts", "conveyor roller and pulley shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1309K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 13xx medium section at 45 mm bore gains rating through a larger 100 mm OD and 25 mm width; verify the housing accepts the larger envelope before substituting for a 1209.", "Tapered-bore 1309K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1309K self-aligning ball bearing?", "a": "A 1309K self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1309." }, { "q": "How does the 1309 bore code work?", "a": "The last two digits of 1309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1309K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1309. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 45 mm bore?", "a": "The 13xx is the medium section: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 1209 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2309", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 100, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 55, "static_load_kN": 16.7, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5600, "speed_oil_rpm": 7100, "weight_g": 1200, "manufacturer_designation": "2309S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2309S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor roller and pulley shafts", "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 45 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2309 units.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2309 self-aligning ball bearing?", "a": "A 2309 self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2309 bore code work?", "a": "The last two digits of 2309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2309?", "a": "A bare 2309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 45 mm bore?", "a": "The 23xx is the wide heavy section: 100×36 mm, 27.5 mm radial section at 45 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2309K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 45, "D_mm": 100, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 55, "static_load_kN": 16.7, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5600, "speed_oil_rpm": 7100, "weight_g": 1200, "manufacturer_designation": "2309SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2309SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 36 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2309. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "agricultural equipment (harvesters, balers)", "industrial fan and blower shafts", "electric motors and generators", "centrifugal pump shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2309K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 23xx heavy wide-section at 45 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2309K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2309K." ], "faq": [ { "q": "What are the dimensions of a 2309K self-aligning ball bearing?", "a": "A 2309K self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2309." }, { "q": "How does the 2309 bore code work?", "a": "The last two digits of 2309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2309K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2309. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 45 mm bore?", "a": "The 23xx is the wide heavy section: 100×36 mm, 27.5 mm radial section at 45 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1210", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 22.8, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 535, "manufacturer_designation": "1210S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1210S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1210 with C3 for those conditions.", "The 12xx light section at 50 mm bore uses a smaller 90 mm OD than a 1310; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1210 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1210-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1210 self-aligning ball bearing?", "a": "A 1210 self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1210 bore code work?", "a": "The last two digits of 1210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1210?", "a": "A bare 1210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 50 mm bore?", "a": "The 12xx is the light section: 90×20 mm with a 20.0 mm radial section at 50 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1210K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 22.8, "static_load_kN": 8.1, "fatigue_load_limit_kN": 0.33, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 535, "manufacturer_designation": "1210SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1210SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1210. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1210 with C3 for those conditions.", "The 12xx light section at 50 mm bore uses a smaller 90 mm OD than a 1310; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1210K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1210K self-aligning ball bearing?", "a": "A 1210K self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1210." }, { "q": "How does the 1210 bore code work?", "a": "The last two digits of 1210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1210K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1210. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 50 mm bore?", "a": "The 12xx is the light section: 90×20 mm with a 20.0 mm radial section at 50 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2210", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 90, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 23.3, "static_load_kN": 8.45, "fatigue_load_limit_kN": 0.57, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 598, "manufacturer_designation": "2210S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2210S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2210 with C3 for those conditions.", "The 22xx wide-section at 50 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1210.", "The open 2210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2210 units.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2210 self-aligning ball bearing?", "a": "A 2210 self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2210 bore code work?", "a": "The last two digits of 2210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2210?", "a": "A bare 2210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 50 mm bore?", "a": "The 22xx is the wide light section: 90×23 mm with a 20.0 mm radial section at 50 mm bore, wider than a 1210 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2210K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 90, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 23.3, "static_load_kN": 8.45, "fatigue_load_limit_kN": 0.57, "limiting_speed_rpm": 6300, "speed_oil_rpm": 8000, "weight_g": 598, "manufacturer_designation": "2210SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2210SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2210. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2210 with C3 for those conditions.", "The 22xx wide-section at 50 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1210.", "Tapered-bore 2210K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2210K." ], "faq": [ { "q": "What are the dimensions of a 2210K self-aligning ball bearing?", "a": "A 2210K self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2210." }, { "q": "How does the 2210 bore code work?", "a": "The last two digits of 2210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2210K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2210. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 50 mm bore?", "a": "The 22xx is the wide light section: 90×23 mm with a 20.0 mm radial section at 50 mm bore, wider than a 1210 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1310", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 43.5, "static_load_kN": 14.1, "fatigue_load_limit_kN": 0.35, "limiting_speed_rpm": 5600, "speed_oil_rpm": 6700, "weight_g": 1230, "manufacturer_designation": "1310S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1310S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1310 with C3 for those conditions.", "The 13xx medium section at 50 mm bore gains rating through a larger 110 mm OD and 27 mm width; verify the housing accepts the larger envelope before substituting for a 1210.", "The open 1310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1310 units.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1310 self-aligning ball bearing?", "a": "A 1310 self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1310 bore code work?", "a": "The last two digits of 1310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1310?", "a": "A bare 1310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 50 mm bore?", "a": "The 13xx is the medium section: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 1210 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1310K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 43.5, "static_load_kN": 14.1, "fatigue_load_limit_kN": 0.35, "limiting_speed_rpm": 5600, "speed_oil_rpm": 6700, "weight_g": 1230, "manufacturer_designation": "1310SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1310SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1310. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1310 with C3 for those conditions.", "The 13xx medium section at 50 mm bore gains rating through a larger 110 mm OD and 27 mm width; verify the housing accepts the larger envelope before substituting for a 1210.", "Tapered-bore 1310K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1310K." ], "faq": [ { "q": "What are the dimensions of a 1310K self-aligning ball bearing?", "a": "A 1310K self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1310." }, { "q": "How does the 1310 bore code work?", "a": "The last two digits of 1310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1310K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1310. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 50 mm bore?", "a": "The 13xx is the medium section: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 1210 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2310", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 110, "B_mm": 40, "seal_type": "open", "dynamic_load_kN": 65, "static_load_kN": 20.2, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 5000, "speed_oil_rpm": 6300, "weight_g": 1630, "manufacturer_designation": "2310S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2310S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 40 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2310 with C3 for those conditions.", "The 23xx heavy wide-section at 50 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2310 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2310." ], "faq": [ { "q": "What are the dimensions of a 2310 self-aligning ball bearing?", "a": "A 2310 self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2310 bore code work?", "a": "The last two digits of 2310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2310?", "a": "A bare 2310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 50 mm bore?", "a": "The 23xx is the wide heavy section: 110×40 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2310K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 50, "D_mm": 110, "B_mm": 40, "seal_type": "open", "dynamic_load_kN": 65, "static_load_kN": 20.2, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 5000, "speed_oil_rpm": 6300, "weight_g": 1630, "manufacturer_designation": "2310SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2310SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 40 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2310. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2310 with C3 for those conditions.", "The 23xx heavy wide-section at 50 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2310K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2310K self-aligning ball bearing?", "a": "A 2310K self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2310." }, { "q": "How does the 2310 bore code work?", "a": "The last two digits of 2310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2310K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2310. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 50 mm bore?", "a": "The 23xx is the wide heavy section: 110×40 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1211", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 26.9, "static_load_kN": 10, "fatigue_load_limit_kN": 0.4, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7100, "weight_g": 708, "manufacturer_designation": "1211S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1211S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1211 with C3 for those conditions.", "The 12xx light section at 55 mm bore uses a smaller 100 mm OD than a 1311; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1211 units.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1211 self-aligning ball bearing?", "a": "A 1211 self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1211 bore code work?", "a": "The last two digits of 1211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1211?", "a": "A bare 1211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 55 mm bore?", "a": "The 12xx is the light section: 100×21 mm with a 22.5 mm radial section at 55 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1211K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 26.9, "static_load_kN": 10, "fatigue_load_limit_kN": 0.4, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7100, "weight_g": 708, "manufacturer_designation": "1211SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1211SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1211. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1211 with C3 for those conditions.", "The 12xx light section at 55 mm bore uses a smaller 100 mm OD than a 1311; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1211K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1211K." ], "faq": [ { "q": "What are the dimensions of a 1211K self-aligning ball bearing?", "a": "A 1211K self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1211." }, { "q": "How does the 1211 bore code work?", "a": "The last two digits of 1211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1211K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1211. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 55 mm bore?", "a": "The 12xx is the light section: 100×21 mm with a 22.5 mm radial section at 55 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2211", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 100, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 26.7, "static_load_kN": 9.9, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7100, "weight_g": 807, "manufacturer_designation": "2211S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2211S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2211 with C3 for those conditions.", "The 22xx wide-section at 55 mm bore adds load capacity through increased 25 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1211.", "The open 2211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2211 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2211." ], "faq": [ { "q": "What are the dimensions of a 2211 self-aligning ball bearing?", "a": "A 2211 self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2211 bore code work?", "a": "The last two digits of 2211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2211?", "a": "A bare 2211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 55 mm bore?", "a": "The 22xx is the wide light section: 100×25 mm with a 22.5 mm radial section at 55 mm bore, wider than a 1211 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2211K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 100, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 26.7, "static_load_kN": 9.9, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 6000, "speed_oil_rpm": 7100, "weight_g": 807, "manufacturer_designation": "2211SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2211SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2211. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2211 with C3 for those conditions.", "The 22xx wide-section at 55 mm bore adds load capacity through increased 25 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1211.", "Tapered-bore 2211K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2211K self-aligning ball bearing?", "a": "A 2211K self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2211." }, { "q": "How does the 2211 bore code work?", "a": "The last two digits of 2211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2211K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2211. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 55 mm bore?", "a": "The 22xx is the wide light section: 100×25 mm with a 22.5 mm radial section at 55 mm bore, wider than a 1211 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1311", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "dynamic_load_kN": 51.5, "static_load_kN": 17.9, "fatigue_load_limit_kN": 0.4, "limiting_speed_rpm": 5000, "speed_oil_rpm": 6300, "weight_g": 1600, "manufacturer_designation": "1311S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1311S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1311 with C3 for those conditions.", "The 13xx medium section at 55 mm bore gains rating through a larger 120 mm OD and 29 mm width; verify the housing accepts the larger envelope before substituting for a 1211.", "The open 1311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1311 units.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1311 self-aligning ball bearing?", "a": "A 1311 self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1311 bore code work?", "a": "The last two digits of 1311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1311?", "a": "A bare 1311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 55 mm bore?", "a": "The 13xx is the medium section: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 1211 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1311K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "dynamic_load_kN": 51.5, "static_load_kN": 17.9, "fatigue_load_limit_kN": 0.4, "limiting_speed_rpm": 5000, "speed_oil_rpm": 6300, "weight_g": 1600, "manufacturer_designation": "1311SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1311SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1311. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1311 with C3 for those conditions.", "The 13xx medium section at 55 mm bore gains rating through a larger 120 mm OD and 29 mm width; verify the housing accepts the larger envelope before substituting for a 1211.", "Tapered-bore 1311K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1311K." ], "faq": [ { "q": "What are the dimensions of a 1311K self-aligning ball bearing?", "a": "A 1311K self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1311." }, { "q": "How does the 1311 bore code work?", "a": "The last two digits of 1311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1311K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1311. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 55 mm bore?", "a": "The 13xx is the medium section: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 1211 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2311", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 120, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 76.5, "static_load_kN": 24, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 2080, "manufacturer_designation": "2311S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2311S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2311 with C3 for those conditions.", "The 23xx heavy wide-section at 55 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2311 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2311." ], "faq": [ { "q": "What are the dimensions of a 2311 self-aligning ball bearing?", "a": "A 2311 self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2311 bore code work?", "a": "The last two digits of 2311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2311?", "a": "A bare 2311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 55 mm bore?", "a": "The 23xx is the wide heavy section: 120×43 mm, 32.5 mm radial section at 55 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2311K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 55, "D_mm": 120, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 76.5, "static_load_kN": 24, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 2080, "manufacturer_designation": "2311SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2311SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2311. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2311 with C3 for those conditions.", "The 23xx heavy wide-section at 55 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2311K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2311-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2311K self-aligning ball bearing?", "a": "A 2311K self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2311." }, { "q": "How does the 2311 bore code work?", "a": "The last two digits of 2311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2311K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2311. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 55 mm bore?", "a": "The 23xx is the wide heavy section: 120×43 mm, 32.5 mm radial section at 55 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1212", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 30.5, "static_load_kN": 11.5, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 5300, "speed_oil_rpm": 6300, "weight_g": 910, "manufacturer_designation": "1212S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1212S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1212 with C3 for those conditions.", "The 12xx light section at 60 mm bore uses a smaller 110 mm OD than a 1312; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1212 units.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1212 self-aligning ball bearing?", "a": "A 1212 self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1212 bore code work?", "a": "The last two digits of 1212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1212?", "a": "A bare 1212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 60 mm bore?", "a": "The 12xx is the light section: 110×22 mm with a 25.0 mm radial section at 60 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1212K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 30.5, "static_load_kN": 11.5, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 5300, "speed_oil_rpm": 6300, "weight_g": 910, "manufacturer_designation": "1212SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1212SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1212. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1212 with C3 for those conditions.", "The 12xx light section at 60 mm bore uses a smaller 110 mm OD than a 1312; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1212K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1212K." ], "faq": [ { "q": "What are the dimensions of a 1212K self-aligning ball bearing?", "a": "A 1212K self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1212." }, { "q": "How does the 1212 bore code work?", "a": "The last two digits of 1212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1212K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1212. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 60 mm bore?", "a": "The 12xx is the light section: 110×22 mm with a 25.0 mm radial section at 60 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2212", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 110, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 34, "static_load_kN": 12.6, "fatigue_load_limit_kN": 0.84, "limiting_speed_rpm": 5300, "speed_oil_rpm": 6300, "weight_g": 1100, "manufacturer_designation": "2212S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2212S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 28 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2212 with C3 for those conditions.", "The 22xx wide-section at 60 mm bore adds load capacity through increased 28 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1212.", "The open 2212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2212 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2212." ], "faq": [ { "q": "What are the dimensions of a 2212 self-aligning ball bearing?", "a": "A 2212 self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2212 bore code work?", "a": "The last two digits of 2212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2212?", "a": "A bare 2212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 60 mm bore?", "a": "The 22xx is the wide light section: 110×28 mm with a 25.0 mm radial section at 60 mm bore, wider than a 1212 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2212K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 110, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 34, "static_load_kN": 12.6, "fatigue_load_limit_kN": 0.84, "limiting_speed_rpm": 5300, "speed_oil_rpm": 6300, "weight_g": 1100, "manufacturer_designation": "2212SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2212SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 28 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2212. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2212 with C3 for those conditions.", "The 22xx wide-section at 60 mm bore adds load capacity through increased 28 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1212.", "Tapered-bore 2212K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2212-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2212K self-aligning ball bearing?", "a": "A 2212K self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2212." }, { "q": "How does the 2212 bore code work?", "a": "The last two digits of 2212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2212K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2212. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 60 mm bore?", "a": "The 22xx is the wide light section: 110×28 mm with a 25.0 mm radial section at 60 mm bore, wider than a 1212 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1312", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 57.5, "static_load_kN": 20.8, "fatigue_load_limit_kN": 0.51, "limiting_speed_rpm": 4500, "speed_oil_rpm": 5600, "weight_g": 2000, "manufacturer_designation": "1312S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1312S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1312 with C3 for those conditions.", "The 13xx medium section at 60 mm bore gains rating through a larger 130 mm OD and 31 mm width; verify the housing accepts the larger envelope before substituting for a 1212.", "The open 1312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1312 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1312." ], "faq": [ { "q": "What are the dimensions of a 1312 self-aligning ball bearing?", "a": "A 1312 self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1312 bore code work?", "a": "The last two digits of 1312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1312?", "a": "A bare 1312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 60 mm bore?", "a": "The 13xx is the medium section: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 1212 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1312K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 57.5, "static_load_kN": 20.8, "fatigue_load_limit_kN": 0.51, "limiting_speed_rpm": 4500, "speed_oil_rpm": 5600, "weight_g": 2000, "manufacturer_designation": "1312SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1312SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1312. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1312 with C3 for those conditions.", "The 13xx medium section at 60 mm bore gains rating through a larger 130 mm OD and 31 mm width; verify the housing accepts the larger envelope before substituting for a 1212.", "Tapered-bore 1312K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1312K self-aligning ball bearing?", "a": "A 1312K self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1312." }, { "q": "How does the 1312 bore code work?", "a": "The last two digits of 1312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1312K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1312. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 60 mm bore?", "a": "The 13xx is the medium section: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 1212 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2312", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 130, "B_mm": 46, "seal_type": "open", "dynamic_load_kN": 88.5, "static_load_kN": 28.3, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 2580, "manufacturer_designation": "2312S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2312S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 46 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2312 with C3 for those conditions.", "The 23xx heavy wide-section at 60 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2312 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2312 self-aligning ball bearing?", "a": "A 2312 self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2312 bore code work?", "a": "The last two digits of 2312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2312?", "a": "A bare 2312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 60 mm bore?", "a": "The 23xx is the wide heavy section: 130×46 mm, 35.0 mm radial section at 60 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2312K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 60, "D_mm": 130, "B_mm": 46, "seal_type": "open", "dynamic_load_kN": 88.5, "static_load_kN": 28.3, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 2580, "manufacturer_designation": "2312SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2312SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 46 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2312. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2312 with C3 for those conditions.", "The 23xx heavy wide-section at 60 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2312K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2312K self-aligning ball bearing?", "a": "A 2312K self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2312." }, { "q": "How does the 2312 bore code work?", "a": "The last two digits of 2312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2312K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2312. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 60 mm bore?", "a": "The 23xx is the wide heavy section: 130×46 mm, 35.0 mm radial section at 60 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1213", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 31, "static_load_kN": 12.5, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 1160, "manufacturer_designation": "1213S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1213S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1213 with C3 for those conditions.", "The 12xx light section at 65 mm bore uses a smaller 120 mm OD than a 1313; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1213 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1213." ], "faq": [ { "q": "What are the dimensions of a 1213 self-aligning ball bearing?", "a": "A 1213 self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1213 bore code work?", "a": "The last two digits of 1213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1213?", "a": "A bare 1213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 65 mm bore?", "a": "The 12xx is the light section: 120×23 mm with a 27.5 mm radial section at 65 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1213K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "dynamic_load_kN": 31, "static_load_kN": 12.5, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 1160, "manufacturer_designation": "1213SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1213SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1213. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1213 with C3 for those conditions.", "The 12xx light section at 65 mm bore uses a smaller 120 mm OD than a 1313; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1213K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1213K self-aligning ball bearing?", "a": "A 1213K self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1213." }, { "q": "How does the 1213 bore code work?", "a": "The last two digits of 1213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1213K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1213. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 65 mm bore?", "a": "The 12xx is the light section: 120×23 mm with a 27.5 mm radial section at 65 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2213", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 120, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 43.5, "static_load_kN": 16.4, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 1500, "manufacturer_designation": "2213S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2213S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2213 with C3 for those conditions.", "The 22xx wide-section at 65 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1213.", "The open 2213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2213 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2213 self-aligning ball bearing?", "a": "A 2213 self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2213 bore code work?", "a": "The last two digits of 2213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2213?", "a": "A bare 2213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 65 mm bore?", "a": "The 22xx is the wide light section: 120×31 mm with a 27.5 mm radial section at 65 mm bore, wider than a 1213 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2213K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 120, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 43.5, "static_load_kN": 16.4, "fatigue_load_limit_kN": 0.92, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6000, "weight_g": 1500, "manufacturer_designation": "2213SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2213SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2213. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2213 with C3 for those conditions.", "The 22xx wide-section at 65 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1213.", "Tapered-bore 2213K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2213K self-aligning ball bearing?", "a": "A 2213K self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2213." }, { "q": "How does the 2213 bore code work?", "a": "The last two digits of 2213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2213K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2213. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 65 mm bore?", "a": "The 22xx is the wide light section: 120×31 mm with a 27.5 mm radial section at 65 mm bore, wider than a 1213 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1313", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 62.5, "static_load_kN": 22.9, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 2470, "manufacturer_designation": "1313S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1313S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1313 with C3 for those conditions.", "The 13xx medium section at 65 mm bore gains rating through a larger 140 mm OD and 33 mm width; verify the housing accepts the larger envelope before substituting for a 1213.", "The open 1313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1313 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1313." ], "faq": [ { "q": "What are the dimensions of a 1313 self-aligning ball bearing?", "a": "A 1313 self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1313 bore code work?", "a": "The last two digits of 1313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1313?", "a": "A bare 1313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 65 mm bore?", "a": "The 13xx is the medium section: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 1213 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1313K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 62.5, "static_load_kN": 22.9, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 2470, "manufacturer_designation": "1313SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1313SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1313. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1313 with C3 for those conditions.", "The 13xx medium section at 65 mm bore gains rating through a larger 140 mm OD and 33 mm width; verify the housing accepts the larger envelope before substituting for a 1213.", "Tapered-bore 1313K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1313-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1313K self-aligning ball bearing?", "a": "A 1313K self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1313." }, { "q": "How does the 1313 bore code work?", "a": "The last two digits of 1313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1313K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1313. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 65 mm bore?", "a": "The 13xx is the medium section: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 1213 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2313", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 140, "B_mm": 48, "seal_type": "open", "dynamic_load_kN": 97, "static_load_kN": 32.5, "fatigue_load_limit_kN": 1.4, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4800, "weight_g": 3200, "manufacturer_designation": "2313S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2313S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 48 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2313 with C3 for those conditions.", "The 23xx heavy wide-section at 65 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2313 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2313-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2313 self-aligning ball bearing?", "a": "A 2313 self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 48 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2313 bore code work?", "a": "The last two digits of 2313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2313?", "a": "A bare 2313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 65 mm bore?", "a": "The 23xx is the wide heavy section: 140×48 mm, 37.5 mm radial section at 65 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2313K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 65, "D_mm": 140, "B_mm": 48, "seal_type": "open", "dynamic_load_kN": 97, "static_load_kN": 32.5, "fatigue_load_limit_kN": 1.4, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4800, "weight_g": 3200, "manufacturer_designation": "2313SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2313SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 48 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2313. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2313 with C3 for those conditions.", "The 23xx heavy wide-section at 65 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2313K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2313K self-aligning ball bearing?", "a": "A 2313K self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 48 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2313." }, { "q": "How does the 2313 bore code work?", "a": "The last two digits of 2313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2313K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2313. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 65 mm bore?", "a": "The 23xx is the wide heavy section: 140×48 mm, 37.5 mm radial section at 65 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1214", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "dynamic_load_kN": 35, "static_load_kN": 13.8, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 4800, "speed_oil_rpm": 5600, "weight_g": 1300, "manufacturer_designation": "1214S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1214S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1214 with C3 for those conditions.", "The 12xx light section at 70 mm bore uses a smaller 125 mm OD than a 1314; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1214 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1214." ], "faq": [ { "q": "What are the dimensions of a 1214 self-aligning ball bearing?", "a": "A 1214 self-aligning ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1214 bore code work?", "a": "The last two digits of 1214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1214?", "a": "A bare 1214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 70 mm bore?", "a": "The 12xx is the light section: 125×24 mm with a 27.5 mm radial section at 70 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2214", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 70, "D_mm": 125, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 44, "static_load_kN": 17.1, "fatigue_load_limit_kN": 1.1, "limiting_speed_rpm": 4500, "speed_oil_rpm": 5600, "weight_g": 1550, "manufacturer_designation": "2214S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2214S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2214 with C3 for those conditions.", "The 22xx wide-section at 70 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1214.", "The open 2214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2214 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2214-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2214 self-aligning ball bearing?", "a": "A 2214 self-aligning ball bearing has a 70 mm bore, 125 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2214 bore code work?", "a": "The last two digits of 2214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2214?", "a": "A bare 2214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 70 mm bore?", "a": "The 22xx is the wide light section: 125×31 mm with a 27.5 mm radial section at 70 mm bore, wider than a 1214 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1314", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "dynamic_load_kN": 75, "static_load_kN": 27.7, "fatigue_load_limit_kN": 0.69, "limiting_speed_rpm": 4000, "speed_oil_rpm": 5000, "weight_g": 3030, "manufacturer_designation": "1314S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1314S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1314 with C3 for those conditions.", "The 13xx medium section at 70 mm bore gains rating through a larger 150 mm OD and 35 mm width; verify the housing accepts the larger envelope before substituting for a 1214.", "The open 1314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1314 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1314 self-aligning ball bearing?", "a": "A 1314 self-aligning ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1314 bore code work?", "a": "The last two digits of 1314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1314?", "a": "A bare 1314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 70 mm bore?", "a": "The 13xx is the medium section: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 1214 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2314", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 70, "D_mm": 150, "B_mm": 51, "seal_type": "open", "dynamic_load_kN": 111, "static_load_kN": 37.5, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4500, "weight_g": 3900, "manufacturer_designation": "2314S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2314S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 51 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2314 with C3 for those conditions.", "The 23xx heavy wide-section at 70 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2314 units.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2314 self-aligning ball bearing?", "a": "A 2314 self-aligning ball bearing has a 70 mm bore, 150 mm outer diameter and 51 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2314 bore code work?", "a": "The last two digits of 2314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2314?", "a": "A bare 2314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 70 mm bore?", "a": "The 23xx is the wide heavy section: 150×51 mm, 40.0 mm radial section at 70 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1215", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 39, "static_load_kN": 15.7, "fatigue_load_limit_kN": 0.63, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 1360, "manufacturer_designation": "1215S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1215S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1215 with C3 for those conditions.", "The 12xx light section at 75 mm bore uses a smaller 130 mm OD than a 1315; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1215 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1215 self-aligning ball bearing?", "a": "A 1215 self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1215 bore code work?", "a": "The last two digits of 1215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1215?", "a": "A bare 1215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 75 mm bore?", "a": "The 12xx is the light section: 130×25 mm with a 27.5 mm radial section at 75 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1215K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 39, "static_load_kN": 15.7, "fatigue_load_limit_kN": 0.63, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 1360, "manufacturer_designation": "1215SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1215SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1215. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1215 with C3 for those conditions.", "The 12xx light section at 75 mm bore uses a smaller 130 mm OD than a 1315; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1215K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1215K self-aligning ball bearing?", "a": "A 1215K self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1215." }, { "q": "How does the 1215 bore code work?", "a": "The last two digits of 1215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1215K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1215. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 75 mm bore?", "a": "The 12xx is the light section: 130×25 mm with a 27.5 mm radial section at 75 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2215", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 130, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 44.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 1600, "manufacturer_designation": "2215S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2215S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2215 with C3 for those conditions.", "The 22xx wide-section at 75 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1215.", "The open 2215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2215 units.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2215 self-aligning ball bearing?", "a": "A 2215 self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2215 bore code work?", "a": "The last two digits of 2215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2215?", "a": "A bare 2215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 75 mm bore?", "a": "The 22xx is the wide light section: 130×31 mm with a 27.5 mm radial section at 75 mm bore, wider than a 1215 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2215K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 130, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 44.5, "static_load_kN": 17.8, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 4300, "speed_oil_rpm": 5300, "weight_g": 1600, "manufacturer_designation": "2215SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2215SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2215. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "gearbox and speed reducer shafts", "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2215 with C3 for those conditions.", "The 22xx wide-section at 75 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1215.", "Tapered-bore 2215K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2215K." ], "faq": [ { "q": "What are the dimensions of a 2215K self-aligning ball bearing?", "a": "A 2215K self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2215." }, { "q": "How does the 2215 bore code work?", "a": "The last two digits of 2215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2215K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2215. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 75 mm bore?", "a": "The 22xx is the wide light section: 130×31 mm with a 27.5 mm radial section at 75 mm bore, wider than a 1215 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1315", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "dynamic_load_kN": 80, "static_load_kN": 30, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3630, "manufacturer_designation": "1315S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1315S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1315 with C3 for those conditions.", "The 13xx medium section at 75 mm bore gains rating through a larger 160 mm OD and 37 mm width; verify the housing accepts the larger envelope before substituting for a 1215.", "The open 1315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1315 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1315-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1315 self-aligning ball bearing?", "a": "A 1315 self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1315 bore code work?", "a": "The last two digits of 1315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1315?", "a": "A bare 1315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 75 mm bore?", "a": "The 13xx is the medium section: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 1215 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1315K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "dynamic_load_kN": 80, "static_load_kN": 30, "fatigue_load_limit_kN": 0.72, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 3630, "manufacturer_designation": "1315SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1315SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1315. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial electric motor shafts", "pump and compressor drive shafts", "gearbox and speed reducer shafts", "conveyor and material handling drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1315 with C3 for those conditions.", "The 13xx medium section at 75 mm bore gains rating through a larger 160 mm OD and 37 mm width; verify the housing accepts the larger envelope before substituting for a 1215.", "Tapered-bore 1315K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1315K self-aligning ball bearing?", "a": "A 1315K self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1315." }, { "q": "How does the 1315 bore code work?", "a": "The last two digits of 1315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1315K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1315. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 75 mm bore?", "a": "The 13xx is the medium section: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 1215 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2315", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 160, "B_mm": 55, "seal_type": "open", "dynamic_load_kN": 125, "static_load_kN": 43, "fatigue_load_limit_kN": 1.8, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4300, "weight_g": 4780, "manufacturer_designation": "2315S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2315S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 55 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "conveyor and material handling drives", "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2315 with C3 for those conditions.", "The 23xx heavy wide-section at 75 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2315 units.", "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2315 self-aligning ball bearing?", "a": "A 2315 self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 55 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2315 bore code work?", "a": "The last two digits of 2315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2315?", "a": "A bare 2315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 75 mm bore?", "a": "The 23xx is the wide heavy section: 160×55 mm, 42.5 mm radial section at 75 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2315K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 75, "D_mm": 160, "B_mm": 55, "seal_type": "open", "dynamic_load_kN": 125, "static_load_kN": 43, "fatigue_load_limit_kN": 1.8, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4300, "weight_g": 4780, "manufacturer_designation": "2315SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2315SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 55 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2315. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "textile and printing machine spindles", "paper mill and processing equipment shafts", "industrial electric motor shafts", "pump and compressor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2315 with C3 for those conditions.", "The 23xx heavy wide-section at 75 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2315K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2315K." ], "faq": [ { "q": "What are the dimensions of a 2315K self-aligning ball bearing?", "a": "A 2315K self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 55 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2315." }, { "q": "How does the 2315 bore code work?", "a": "The last two digits of 2315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2315K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2315. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 75 mm bore?", "a": "The 23xx is the wide heavy section: 160×55 mm, 42.5 mm radial section at 75 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1216", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 40, "static_load_kN": 17, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4000, "speed_oil_rpm": 5000, "weight_g": 1680, "manufacturer_designation": "1216S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1216S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 80 mm bore uses a smaller 140 mm OD than a 1316; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1216 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1216-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1216 self-aligning ball bearing?", "a": "A 1216 self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1216 bore code work?", "a": "The last two digits of 1216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1216?", "a": "A bare 1216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 80 mm bore?", "a": "The 12xx is the light section: 140×26 mm with a 30.0 mm radial section at 80 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1216K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 40, "static_load_kN": 17, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4000, "speed_oil_rpm": 5000, "weight_g": 1680, "manufacturer_designation": "1216SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1216SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1216. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 80 mm bore uses a smaller 140 mm OD than a 1316; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1216K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1216K self-aligning ball bearing?", "a": "A 1216K self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1216." }, { "q": "How does the 1216 bore code work?", "a": "The last two digits of 1216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1216K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1216. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 80 mm bore?", "a": "The 12xx is the light section: 140×26 mm with a 30.0 mm radial section at 80 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2216", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 140, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 49, "static_load_kN": 19.9, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 4000, "speed_oil_rpm": 5000, "weight_g": 2020, "manufacturer_designation": "2216S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2216S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 80 mm bore adds load capacity through increased 33 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1216.", "The open 2216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2216 units.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2216 self-aligning ball bearing?", "a": "A 2216 self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2216 bore code work?", "a": "The last two digits of 2216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2216?", "a": "A bare 2216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 80 mm bore?", "a": "The 22xx is the wide light section: 140×33 mm with a 30.0 mm radial section at 80 mm bore, wider than a 1216 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2216K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 140, "B_mm": 33, "seal_type": "open", "dynamic_load_kN": 49, "static_load_kN": 19.9, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 4000, "speed_oil_rpm": 5000, "weight_g": 2020, "manufacturer_designation": "2216SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2216SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2216. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 80 mm bore adds load capacity through increased 33 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1216.", "Tapered-bore 2216K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2216K." ], "faq": [ { "q": "What are the dimensions of a 2216K self-aligning ball bearing?", "a": "A 2216K self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2216." }, { "q": "How does the 2216 bore code work?", "a": "The last two digits of 2216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2216K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2216. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 80 mm bore?", "a": "The 22xx is the wide light section: 140×33 mm with a 30.0 mm radial section at 80 mm bore, wider than a 1216 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1316", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "dynamic_load_kN": 89, "static_load_kN": 33, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 4240, "manufacturer_designation": "1316S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1316S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 80 mm bore gains rating through a larger 170 mm OD and 39 mm width; verify the housing accepts the larger envelope before substituting for a 1216.", "The open 1316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1316 units.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1316 self-aligning ball bearing?", "a": "A 1316 self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1316 bore code work?", "a": "The last two digits of 1316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1316?", "a": "A bare 1316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 80 mm bore?", "a": "The 13xx is the medium section: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 1216 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1316K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "dynamic_load_kN": 89, "static_load_kN": 33, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 4240, "manufacturer_designation": "1316SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1316SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1316. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 80 mm bore gains rating through a larger 170 mm OD and 39 mm width; verify the housing accepts the larger envelope before substituting for a 1216.", "Tapered-bore 1316K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1316K." ], "faq": [ { "q": "What are the dimensions of a 1316K self-aligning ball bearing?", "a": "A 1316K self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1316." }, { "q": "How does the 1316 bore code work?", "a": "The last two digits of 1316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1316K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1316. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 80 mm bore?", "a": "The 13xx is the medium section: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 1216 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2316", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 170, "B_mm": 58, "seal_type": "open", "dynamic_load_kN": 130, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4000, "weight_g": 5630, "manufacturer_designation": "2316S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2316S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 58 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 80 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2316 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2316." ], "faq": [ { "q": "What are the dimensions of a 2316 self-aligning ball bearing?", "a": "A 2316 self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 58 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2316 bore code work?", "a": "The last two digits of 2316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2316?", "a": "A bare 2316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 80 mm bore?", "a": "The 23xx is the wide heavy section: 170×58 mm, 45.0 mm radial section at 80 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2316K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 80, "D_mm": 170, "B_mm": 58, "seal_type": "open", "dynamic_load_kN": 130, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4000, "weight_g": 5630, "manufacturer_designation": "2316SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2316SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 58 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2316. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 80 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2316K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2316K self-aligning ball bearing?", "a": "A 2316K self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 58 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2316." }, { "q": "How does the 2316 bore code work?", "a": "The last two digits of 2316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2316K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2316. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 80 mm bore?", "a": "The 23xx is the wide heavy section: 170×58 mm, 45.0 mm radial section at 80 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1217", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 49.5, "static_load_kN": 20.8, "fatigue_load_limit_kN": 0.83, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 2100, "manufacturer_designation": "1217S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1217S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 85 mm bore uses a smaller 150 mm OD than a 1317; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1217 units.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1217 self-aligning ball bearing?", "a": "A 1217 self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1217 bore code work?", "a": "The last two digits of 1217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1217?", "a": "A bare 1217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 85 mm bore?", "a": "The 12xx is the light section: 150×28 mm with a 32.5 mm radial section at 85 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1217K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 49.5, "static_load_kN": 20.8, "fatigue_load_limit_kN": 0.83, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4500, "weight_g": 2100, "manufacturer_designation": "1217SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1217SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1217. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 85 mm bore uses a smaller 150 mm OD than a 1317; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1217K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1217K." ], "faq": [ { "q": "What are the dimensions of a 1217K self-aligning ball bearing?", "a": "A 1217K self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1217." }, { "q": "How does the 1217 bore code work?", "a": "The last two digits of 1217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1217K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1217. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 85 mm bore?", "a": "The 12xx is the light section: 150×28 mm with a 32.5 mm radial section at 85 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2217", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 150, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 58.5, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1.5, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4800, "weight_g": 2560, "manufacturer_designation": "2217S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2217S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 85 mm bore adds load capacity through increased 36 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1217.", "The open 2217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2217 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2217." ], "faq": [ { "q": "What are the dimensions of a 2217 self-aligning ball bearing?", "a": "A 2217 self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2217 bore code work?", "a": "The last two digits of 2217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2217?", "a": "A bare 2217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 85 mm bore?", "a": "The 22xx is the wide light section: 150×36 mm with a 32.5 mm radial section at 85 mm bore, wider than a 1217 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2217K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 150, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 58.5, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1.5, "limiting_speed_rpm": 3800, "speed_oil_rpm": 4800, "weight_g": 2560, "manufacturer_designation": "2217SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2217SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 36 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2217. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 85 mm bore adds load capacity through increased 36 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1217.", "Tapered-bore 2217K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2217K self-aligning ball bearing?", "a": "A 2217K self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2217." }, { "q": "How does the 2217 bore code work?", "a": "The last two digits of 2217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2217K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2217. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 85 mm bore?", "a": "The 22xx is the wide light section: 150×36 mm with a 32.5 mm radial section at 85 mm bore, wider than a 1217 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1317", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "dynamic_load_kN": 98.5, "static_load_kN": 38, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5030, "manufacturer_designation": "1317S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1317S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 85 mm bore gains rating through a larger 180 mm OD and 41 mm width; verify the housing accepts the larger envelope before substituting for a 1217.", "The open 1317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1317 units.", "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1317 self-aligning ball bearing?", "a": "A 1317 self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1317 bore code work?", "a": "The last two digits of 1317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1317?", "a": "A bare 1317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 85 mm bore?", "a": "The 13xx is the medium section: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 1217 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1317K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "dynamic_load_kN": 98.5, "static_load_kN": 38, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 5030, "manufacturer_designation": "1317SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1317SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1317. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 85 mm bore gains rating through a larger 180 mm OD and 41 mm width; verify the housing accepts the larger envelope before substituting for a 1217.", "Tapered-bore 1317K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1317K." ], "faq": [ { "q": "What are the dimensions of a 1317K self-aligning ball bearing?", "a": "A 1317K self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1317." }, { "q": "How does the 1317 bore code work?", "a": "The last two digits of 1317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1317K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1317. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 85 mm bore?", "a": "The 13xx is the medium section: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 1217 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2317", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 180, "B_mm": 60, "seal_type": "open", "dynamic_load_kN": 142, "static_load_kN": 51.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3800, "weight_g": 6560, "manufacturer_designation": "2317S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2317S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 60 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 85 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×60 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2317 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2317." ], "faq": [ { "q": "What are the dimensions of a 2317 self-aligning ball bearing?", "a": "A 2317 self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 60 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2317 bore code work?", "a": "The last two digits of 2317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 60 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2317?", "a": "A bare 2317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 85 mm bore?", "a": "The 23xx is the wide heavy section: 180×60 mm, 47.5 mm radial section at 85 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2317K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 85, "D_mm": 180, "B_mm": 60, "seal_type": "open", "dynamic_load_kN": 142, "static_load_kN": 51.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3800, "weight_g": 6560, "manufacturer_designation": "2317SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2317SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 60 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2317. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 85 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2317K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2317-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2317K self-aligning ball bearing?", "a": "A 2317K self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 60 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2317." }, { "q": "How does the 2317 bore code work?", "a": "The last two digits of 2317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 60 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2317K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2317. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 85 mm bore?", "a": "The 23xx is the wide heavy section: 180×60 mm, 47.5 mm radial section at 85 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1218", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "dynamic_load_kN": 57.5, "static_load_kN": 23.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 2560, "manufacturer_designation": "1218S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1218S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 90 mm bore uses a smaller 160 mm OD than a 1318; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1218 units.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1218 self-aligning ball bearing?", "a": "A 1218 self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1218 bore code work?", "a": "The last two digits of 1218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1218?", "a": "A bare 1218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 90 mm bore?", "a": "The 12xx is the light section: 160×30 mm with a 35.0 mm radial section at 90 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1218K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "dynamic_load_kN": 57.5, "static_load_kN": 23.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 2560, "manufacturer_designation": "1218SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1218SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1218. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 90 mm bore uses a smaller 160 mm OD than a 1318; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1218K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1218K." ], "faq": [ { "q": "What are the dimensions of a 1218K self-aligning ball bearing?", "a": "A 1218K self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1218." }, { "q": "How does the 1218 bore code work?", "a": "The last two digits of 1218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1218K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1218. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 90 mm bore?", "a": "The 12xx is the light section: 160×30 mm with a 35.0 mm radial section at 90 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2218", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 160, "B_mm": 40, "seal_type": "open", "dynamic_load_kN": 70.5, "static_load_kN": 28.7, "fatigue_load_limit_kN": 1.8, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3220, "manufacturer_designation": "2218S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2218S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 40 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 90 mm bore adds load capacity through increased 40 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1218.", "The open 2218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2218 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2218." ], "faq": [ { "q": "What are the dimensions of a 2218 self-aligning ball bearing?", "a": "A 2218 self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2218 bore code work?", "a": "The last two digits of 2218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2218?", "a": "A bare 2218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 90 mm bore?", "a": "The 22xx is the wide light section: 160×40 mm with a 35.0 mm radial section at 90 mm bore, wider than a 1218 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2218K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 160, "B_mm": 40, "seal_type": "open", "dynamic_load_kN": 70.5, "static_load_kN": 28.7, "fatigue_load_limit_kN": 1.8, "limiting_speed_rpm": 3600, "speed_oil_rpm": 4300, "weight_g": 3220, "manufacturer_designation": "2218SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2218SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 40 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2218. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 90 mm bore adds load capacity through increased 40 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1218.", "Tapered-bore 2218K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2218-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2218K self-aligning ball bearing?", "a": "A 2218K self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2218." }, { "q": "How does the 2218 bore code work?", "a": "The last two digits of 2218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2218K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2218. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 90 mm bore?", "a": "The 22xx is the wide light section: 160×40 mm with a 35.0 mm radial section at 90 mm bore, wider than a 1218 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1318", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 117, "static_load_kN": 44.5, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 5830, "manufacturer_designation": "1318S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1318S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 90 mm bore gains rating through a larger 190 mm OD and 43 mm width; verify the housing accepts the larger envelope before substituting for a 1218.", "The open 1318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1318 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1318." ], "faq": [ { "q": "What are the dimensions of a 1318 self-aligning ball bearing?", "a": "A 1318 self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1318 bore code work?", "a": "The last two digits of 1318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1318?", "a": "A bare 1318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 90 mm bore?", "a": "The 13xx is the medium section: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 1218 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1318K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 117, "static_load_kN": 44.5, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 5830, "manufacturer_designation": "1318SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1318SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1318. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 90 mm bore gains rating through a larger 190 mm OD and 43 mm width; verify the housing accepts the larger envelope before substituting for a 1218.", "Tapered-bore 1318K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1318K self-aligning ball bearing?", "a": "A 1318K self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1318." }, { "q": "How does the 1318 bore code work?", "a": "The last two digits of 1318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1318K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1318. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 90 mm bore?", "a": "The 13xx is the medium section: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 1218 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2318", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 190, "B_mm": 64, "seal_type": "open", "dynamic_load_kN": 154, "static_load_kN": 57.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3600, "weight_g": 7750, "manufacturer_designation": "2318S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2318S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 64 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 90 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×64 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2318 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2318 self-aligning ball bearing?", "a": "A 2318 self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 64 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2318 bore code work?", "a": "The last two digits of 2318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 64 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2318?", "a": "A bare 2318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 90 mm bore?", "a": "The 23xx is the wide heavy section: 190×64 mm, 50.0 mm radial section at 90 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2318K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 90, "D_mm": 190, "B_mm": 64, "seal_type": "open", "dynamic_load_kN": 154, "static_load_kN": 57.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3600, "weight_g": 7750, "manufacturer_designation": "2318SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2318SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 64 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2318. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 90 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2318K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2318K self-aligning ball bearing?", "a": "A 2318K self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 64 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2318." }, { "q": "How does the 2318 bore code work?", "a": "The last two digits of 2318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 64 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2318K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2318. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 90 mm bore?", "a": "The 23xx is the wide heavy section: 190×64 mm, 50.0 mm radial section at 90 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1219", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "dynamic_load_kN": 64, "static_load_kN": 27.1, "fatigue_load_limit_kN": 1.1, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3120, "manufacturer_designation": "1219S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1219S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 95 mm bore uses a smaller 170 mm OD than a 1319; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1219 units.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1219." ], "faq": [ { "q": "What are the dimensions of a 1219 self-aligning ball bearing?", "a": "A 1219 self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1219 bore code work?", "a": "The last two digits of 1219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1219?", "a": "A bare 1219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 95 mm bore?", "a": "The 12xx is the light section: 170×32 mm with a 37.5 mm radial section at 95 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1219K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "dynamic_load_kN": 64, "static_load_kN": 27.1, "fatigue_load_limit_kN": 1.1, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3120, "manufacturer_designation": "1219SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1219SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1219. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 95 mm bore uses a smaller 170 mm OD than a 1319; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1219K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1219K self-aligning ball bearing?", "a": "A 1219K self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1219." }, { "q": "How does the 1219 bore code work?", "a": "The last two digits of 1219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1219K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1219. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 95 mm bore?", "a": "The 12xx is the light section: 170×32 mm with a 37.5 mm radial section at 95 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2219", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 170, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 84, "static_load_kN": 34.5, "fatigue_load_limit_kN": 2, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3960, "manufacturer_designation": "2219S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2219S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 95 mm bore adds load capacity through increased 43 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1219.", "The open 2219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2219 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 2219 self-aligning ball bearing?", "a": "A 2219 self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2219 bore code work?", "a": "The last two digits of 2219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2219?", "a": "A bare 2219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 95 mm bore?", "a": "The 22xx is the wide light section: 170×43 mm with a 37.5 mm radial section at 95 mm bore, wider than a 1219 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2219K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 170, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 84, "static_load_kN": 34.5, "fatigue_load_limit_kN": 2, "limiting_speed_rpm": 3400, "speed_oil_rpm": 4000, "weight_g": 3960, "manufacturer_designation": "2219SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2219SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2219. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 95 mm bore adds load capacity through increased 43 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1219.", "Tapered-bore 2219K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2219K self-aligning ball bearing?", "a": "A 2219K self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2219." }, { "q": "How does the 2219 bore code work?", "a": "The last two digits of 2219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2219K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2219. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 95 mm bore?", "a": "The 22xx is the wide light section: 170×43 mm with a 37.5 mm radial section at 95 mm bore, wider than a 1219 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1319", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "dynamic_load_kN": 129, "static_load_kN": 51, "fatigue_load_limit_kN": 1.4, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 6790, "manufacturer_designation": "1319S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1319S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 95 mm bore gains rating through a larger 200 mm OD and 45 mm width; verify the housing accepts the larger envelope before substituting for a 1219.", "The open 1319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1319 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1319." ], "faq": [ { "q": "What are the dimensions of a 1319 self-aligning ball bearing?", "a": "A 1319 self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1319 bore code work?", "a": "The last two digits of 1319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1319?", "a": "A bare 1319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 95 mm bore?", "a": "The 13xx is the medium section: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 1219 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1319K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "dynamic_load_kN": 129, "static_load_kN": 51, "fatigue_load_limit_kN": 1.4, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 6790, "manufacturer_designation": "1319SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1319SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1319. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 95 mm bore gains rating through a larger 200 mm OD and 45 mm width; verify the housing accepts the larger envelope before substituting for a 1219.", "Tapered-bore 1319K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1319-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1319K self-aligning ball bearing?", "a": "A 1319K self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1319." }, { "q": "How does the 1319 bore code work?", "a": "The last two digits of 1319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1319K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1319. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 95 mm bore?", "a": "The 13xx is the medium section: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 1219 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2319", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 200, "B_mm": 67, "seal_type": "open", "dynamic_load_kN": 161, "static_load_kN": 64.5, "fatigue_load_limit_kN": 2.7, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 8970, "manufacturer_designation": "2319S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2319S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 67 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 95 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×67 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2319 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2319-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2319 self-aligning ball bearing?", "a": "A 2319 self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 67 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2319 bore code work?", "a": "The last two digits of 2319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 67 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2319?", "a": "A bare 2319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 95 mm bore?", "a": "The 23xx is the wide heavy section: 200×67 mm, 52.5 mm radial section at 95 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2319K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 95, "D_mm": 200, "B_mm": 67, "seal_type": "open", "dynamic_load_kN": 161, "static_load_kN": 64.5, "fatigue_load_limit_kN": 2.7, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 8970, "manufacturer_designation": "2319SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2319SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 67 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2319. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 95 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2319K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 67 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2319K self-aligning ball bearing?", "a": "A 2319K self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 67 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2319." }, { "q": "How does the 2319 bore code work?", "a": "The last two digits of 2319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 67 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2319K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2319. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 95 mm bore?", "a": "The 23xx is the wide heavy section: 200×67 mm, 52.5 mm radial section at 95 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1220", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "dynamic_load_kN": 69.5, "static_load_kN": 29.7, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3740, "manufacturer_designation": "1220S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1220S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 100 mm bore uses a smaller 180 mm OD than a 1320; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1220 units.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1220." ], "faq": [ { "q": "What are the dimensions of a 1220 self-aligning ball bearing?", "a": "A 1220 self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1220 bore code work?", "a": "The last two digits of 1220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1220?", "a": "A bare 1220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 100 mm bore?", "a": "The 12xx is the light section: 180×34 mm with a 40.0 mm radial section at 100 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1220K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "dynamic_load_kN": 69.5, "static_load_kN": 29.7, "fatigue_load_limit_kN": 1.2, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 3740, "manufacturer_designation": "1220SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1220SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1220. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 100 mm bore uses a smaller 180 mm OD than a 1320; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1220K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1220-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1220K self-aligning ball bearing?", "a": "A 1220K self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1220." }, { "q": "How does the 1220 bore code work?", "a": "The last two digits of 1220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1220K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1220. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 100 mm bore?", "a": "The 12xx is the light section: 180×34 mm with a 40.0 mm radial section at 100 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2220", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 180, "B_mm": 46, "seal_type": "open", "dynamic_load_kN": 94.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 4710, "manufacturer_designation": "2220S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2220S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 46 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 100 mm bore adds load capacity through increased 46 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1220.", "The open 2220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2220 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2220-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 2220 self-aligning ball bearing?", "a": "A 2220 self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2220 bore code work?", "a": "The last two digits of 2220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2220?", "a": "A bare 2220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 100 mm bore?", "a": "The 22xx is the wide light section: 180×46 mm with a 40.0 mm radial section at 100 mm bore, wider than a 1220 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2220K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 180, "B_mm": 46, "seal_type": "open", "dynamic_load_kN": 94.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 2.3, "limiting_speed_rpm": 3200, "speed_oil_rpm": 3800, "weight_g": 4710, "manufacturer_designation": "2220SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2220SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 46 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2220. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 100 mm bore adds load capacity through increased 46 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1220.", "Tapered-bore 2220K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2220K self-aligning ball bearing?", "a": "A 2220K self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2220." }, { "q": "How does the 2220 bore code work?", "a": "The last two digits of 2220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2220K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2220. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 100 mm bore?", "a": "The 22xx is the wide light section: 180×46 mm with a 40.0 mm radial section at 100 mm bore, wider than a 1220 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1320", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "dynamic_load_kN": 140, "static_load_kN": 57.5, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 8400, "manufacturer_designation": "1320S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1320S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 100 mm bore gains rating through a larger 215 mm OD and 47 mm width; verify the housing accepts the larger envelope before substituting for a 1220.", "The open 1320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1320 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1320 self-aligning ball bearing?", "a": "A 1320 self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1320 bore code work?", "a": "The last two digits of 1320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1320?", "a": "A bare 1320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 100 mm bore?", "a": "The 13xx is the medium section: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 1220 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1320K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "dynamic_load_kN": 140, "static_load_kN": 57.5, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 8400, "manufacturer_designation": "1320SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1320SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1320. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 100 mm bore gains rating through a larger 215 mm OD and 47 mm width; verify the housing accepts the larger envelope before substituting for a 1220.", "Tapered-bore 1320K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1320K self-aligning ball bearing?", "a": "A 1320K self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1320." }, { "q": "How does the 1320 bore code work?", "a": "The last two digits of 1320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1320K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1320. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 100 mm bore?", "a": "The 13xx is the medium section: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 1220 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2320", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 215, "B_mm": 73, "seal_type": "open", "dynamic_load_kN": 187, "static_load_kN": 79, "fatigue_load_limit_kN": 3.3, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3200, "weight_g": 11500, "manufacturer_designation": "2320S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2320S" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 73 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 100 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "The open 2320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×73 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2320 units.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2320 self-aligning ball bearing?", "a": "A 2320 self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 73 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2320 bore code work?", "a": "The last two digits of 2320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 73 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2320?", "a": "A bare 2320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2300 compare with other self-aligning series at the same 100 mm bore?", "a": "The 23xx is the wide heavy section: 215×73 mm, 57.5 mm radial section at 100 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2320K", "brand": "NTN", "series": "2300-series", "type": "self_aligning_ball", "d_mm": 100, "D_mm": 215, "B_mm": 73, "seal_type": "open", "dynamic_load_kN": 187, "static_load_kN": 79, "fatigue_load_limit_kN": 3.3, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3200, "weight_g": 11500, "manufacturer_designation": "2320SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2320SK" ], "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 73 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2320. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 23xx heavy wide-section at 100 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.", "Tapered-bore 2320K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2320K." ], "faq": [ { "q": "What are the dimensions of a 2320K self-aligning ball bearing?", "a": "A 2320K self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 73 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2320." }, { "q": "How does the 2320 bore code work?", "a": "The last two digits of 2320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 73 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2320K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2320. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2300 compare with other self-aligning series at the same 100 mm bore?", "a": "The 23xx is the wide heavy section: 215×73 mm, 57.5 mm radial section at 100 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1221", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 75, "static_load_kN": 32.5, "fatigue_load_limit_kN": 1.3, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 4430, "manufacturer_designation": "1221S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1221S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 105 mm bore uses a smaller 190 mm OD than a 1321; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1221 units.", "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing." ], "faq": [ { "q": "What are the dimensions of a 1221 self-aligning ball bearing?", "a": "A 1221 self-aligning ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1221 bore code work?", "a": "The last two digits of 1221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1221?", "a": "A bare 1221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 105 mm bore?", "a": "The 12xx is the light section: 190×36 mm with a 42.5 mm radial section at 105 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2221", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 105, "D_mm": 190, "B_mm": 50, "seal_type": "open", "dynamic_load_kN": 109, "static_load_kN": 45, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 3000, "speed_oil_rpm": 3600, "weight_g": 5730, "manufacturer_designation": "2221S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2221S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 50 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 105 mm bore adds load capacity through increased 50 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1221.", "The open 2221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2221 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 2221 self-aligning ball bearing?", "a": "A 2221 self-aligning ball bearing has a 105 mm bore, 190 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2221 bore code work?", "a": "The last two digits of 2221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2221?", "a": "A bare 2221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 105 mm bore?", "a": "The 22xx is the wide light section: 190×50 mm with a 42.5 mm radial section at 105 mm bore, wider than a 1221 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1321", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "dynamic_load_kN": 154, "static_load_kN": 64.5, "fatigue_load_limit_kN": 1.8, "limiting_speed_rpm": 2600, "speed_oil_rpm": 3200, "weight_g": 9580, "manufacturer_designation": "1321S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1321S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 105 mm bore gains rating through a larger 225 mm OD and 49 mm width; verify the housing accepts the larger envelope before substituting for a 1221.", "The open 1321 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1321 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1321-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1321 self-aligning ball bearing?", "a": "A 1321 self-aligning ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1321 bore code work?", "a": "The last two digits of 1321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1321?", "a": "A bare 1321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 105 mm bore?", "a": "The 13xx is the medium section: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 1221 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1222", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "dynamic_load_kN": 87, "static_load_kN": 38.5, "fatigue_load_limit_kN": 1.5, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 5210, "manufacturer_designation": "1222S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1222S" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 110 mm bore uses a smaller 200 mm OD than a 1322; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "The open 1222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1222 units.", "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1222-C3. No clearance suffix means normal CN clearance." ], "faq": [ { "q": "What are the dimensions of a 1222 self-aligning ball bearing?", "a": "A 1222 self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1222 bore code work?", "a": "The last two digits of 1222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1222?", "a": "A bare 1222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1200 compare with other self-aligning series at the same 110 mm bore?", "a": "The 12xx is the light section: 200×38 mm with a 45.0 mm radial section at 110 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1222K", "brand": "NTN", "series": "1200-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "dynamic_load_kN": 87, "static_load_kN": 38.5, "fatigue_load_limit_kN": 1.5, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 5210, "manufacturer_designation": "1222SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1222SK" ], "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1222. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "pulp, paper and steel mill machinery", "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 12xx light section at 110 mm bore uses a smaller 200 mm OD than a 1322; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.", "Tapered-bore 1222K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 1222K self-aligning ball bearing?", "a": "A 1222K self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1222." }, { "q": "How does the 1222 bore code work?", "a": "The last two digits of 1222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1222K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1222. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1200 compare with other self-aligning series at the same 110 mm bore?", "a": "The 12xx is the light section: 200×38 mm with a 45.0 mm radial section at 110 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2222", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 200, "B_mm": 53, "seal_type": "open", "dynamic_load_kN": 122, "static_load_kN": 51.5, "fatigue_load_limit_kN": 2.9, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 6750, "manufacturer_designation": "2222S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2222S" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 53 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 110 mm bore adds load capacity through increased 53 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1222.", "The open 2222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×53 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2222 units.", "Shaft and housing fillets must clear the bearing chamfer so the 53 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 2222 self-aligning ball bearing?", "a": "A 2222 self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 53 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 2222 bore code work?", "a": "The last two digits of 2222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 53 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 2222?", "a": "A bare 2222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 2200 compare with other self-aligning series at the same 110 mm bore?", "a": "The 22xx is the wide light section: 200×53 mm with a 45.0 mm radial section at 110 mm bore, wider than a 1222 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "2222K", "brand": "NTN", "series": "2200-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 200, "B_mm": 53, "seal_type": "open", "dynamic_load_kN": 122, "static_load_kN": 51.5, "fatigue_load_limit_kN": 2.9, "limiting_speed_rpm": 2800, "speed_oil_rpm": 3400, "weight_g": 6750, "manufacturer_designation": "2222SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "2222SK" ], "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 53 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2222. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "hoist, winch and crane drums", "heavy conveyor drive shafts", "pulp, paper and steel mill machinery", "heavy industrial drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading and stress concentration from excessive misalignment beyond the allowable angle", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 22xx wide-section at 110 mm bore adds load capacity through increased 53 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1222.", "Tapered-bore 2222K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2222K." ], "faq": [ { "q": "What are the dimensions of a 2222K self-aligning ball bearing?", "a": "A 2222K self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 53 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2222." }, { "q": "How does the 2222 bore code work?", "a": "The last two digits of 2222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 53 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 2222K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2222. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 2200 compare with other self-aligning series at the same 110 mm bore?", "a": "The 22xx is the wide light section: 200×53 mm with a 45.0 mm radial section at 110 mm bore, wider than a 1222 for higher load capacity at the cost of speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1322", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "dynamic_load_kN": 161, "static_load_kN": 72.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3000, "weight_g": 11500, "manufacturer_designation": "1322S", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1322S" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "heavy industrial drive shafts", "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 110 mm bore gains rating through a larger 240 mm OD and 50 mm width; verify the housing accepts the larger envelope before substituting for a 1222.", "The open 1322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1322 units.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft." ], "faq": [ { "q": "What are the dimensions of a 1322 self-aligning ball bearing?", "a": "A 1322 self-aligning ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting." }, { "q": "How does the 1322 bore code work?", "a": "The last two digits of 1322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the open suffix mean on 1322?", "a": "A bare 1322 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 1300 compare with other self-aligning series at the same 110 mm bore?", "a": "The 13xx is the medium section: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 1222 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "1322K", "brand": "NTN", "series": "1300-series", "type": "self_aligning_ball", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "dynamic_load_kN": 161, "static_load_kN": 72.5, "fatigue_load_limit_kN": 2.1, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3000, "weight_g": 11500, "manufacturer_designation": "1322SK", "standard": "ISO 15", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "1322SK" ], "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1322. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.", "applications": [ "large gearbox and reducer shafts", "industrial fan and blower rotors", "hoist, winch and crane drums", "heavy conveyor drive shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "edge loading and stress concentration from excessive misalignment beyond the allowable angle" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 13xx medium section at 110 mm bore gains rating through a larger 240 mm OD and 50 mm width; verify the housing accepts the larger envelope before substituting for a 1222.", "Tapered-bore 1322K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.", "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.", "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1322K." ], "faq": [ { "q": "What are the dimensions of a 1322K self-aligning ball bearing?", "a": "A 1322K self-aligning ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1322." }, { "q": "How does the 1322 bore code work?", "a": "The last two digits of 1322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the K suffix mean on 1322K?", "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1322. Adapter sleeves are sold separately and must match the bore code." }, { "q": "How does the 1300 compare with other self-aligning series at the same 110 mm bore?", "a": "The 13xx is the medium section: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 1222 but needing a larger housing bore." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51100", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 10, "D_mm": 24, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 10, "static_load_kN": 14, "fatigue_load_limit_kN": 0.63, "limiting_speed_rpm": 6700, "speed_oil_rpm": 9500, "weight_g": 21, "manufacturer_designation": "51100", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51100 carries bore code 00 = 10 mm. The ISO 104 boundary dimensions are 10 mm bore, 24 mm outside diameter and 9 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "light-duty fan axial restraint", "power tool thrust collars", "small electric motor axial positioning", "appliance gearbox thrust washers" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 10 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 511xx light section at 10 mm bore uses a smaller 24 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The 9 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51100.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51100 thrust ball bearing?", "a": "A 51100 thrust ball bearing has a 10 mm bore, 24 mm outside diameter and 9 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51100 bore code work?", "a": "The last two digits of 51100 are bore code 00, giving 00 × 5 = 10 mm bore. The 24 mm outside diameter and 9 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51100 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 10 mm bore?", "a": "The 511xx is the light section: 24×9 mm with a 7.0 mm radial section at 10 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51200", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 10, "D_mm": 26, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 12.7, "static_load_kN": 17.1, "fatigue_load_limit_kN": 0.77, "limiting_speed_rpm": 5800, "speed_oil_rpm": 8300, "weight_g": 30, "manufacturer_designation": "51200", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51200 carries bore code 00 = 10 mm. The ISO 104 boundary dimensions are 10 mm bore, 26 mm outside diameter and 11 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "small electric motor axial positioning", "appliance gearbox thrust washers", "small pump axial load support", "instrument and office machine spindles" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 10 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 512xx medium-light section at 10 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 26 mm OD and 11 mm height.", "Thrust ball bearings carry axial load only — never apply radial load to 51200; the flat washers will skid and score.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51200 thrust ball bearing?", "a": "A 51200 thrust ball bearing has a 10 mm bore, 26 mm outside diameter and 11 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51200 bore code work?", "a": "The last two digits of 51200 are bore code 00, giving 00 × 5 = 10 mm bore. The 26 mm outside diameter and 11 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51200 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 10 mm bore?", "a": "The 512xx is the medium-light section: 26×11 mm, 8.0 mm radial section at 10 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51101", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 12, "D_mm": 26, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 10.3, "static_load_kN": 15.4, "fatigue_load_limit_kN": 0.695, "limiting_speed_rpm": 6400, "speed_oil_rpm": 9200, "weight_g": 23, "manufacturer_designation": "51101", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51101 carries bore code 01 = 12 mm. The ISO 104 boundary dimensions are 12 mm bore, 26 mm outside diameter and 9 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "small electric motor axial positioning", "appliance gearbox thrust washers", "small pump axial load support", "instrument and office machine spindles" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 12 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 511xx light section at 12 mm bore uses a smaller 26 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Thrust ball bearings carry axial load only — never apply radial load to 51101; the flat washers will skid and score.", "The shaft washer (bore 12 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51101 thrust ball bearing?", "a": "A 51101 thrust ball bearing has a 12 mm bore, 26 mm outside diameter and 9 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51101 bore code work?", "a": "The last two digits of 51101 are bore code 01, giving 01 × 5 = 12 mm bore. The 26 mm outside diameter and 9 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51101 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 12 mm bore?", "a": "The 511xx is the light section: 26×9 mm with a 7.0 mm radial section at 12 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51201", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 12, "D_mm": 28, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 13.2, "static_load_kN": 19, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 5600, "speed_oil_rpm": 8000, "weight_g": 34, "manufacturer_designation": "51201", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51201 carries bore code 01 = 12 mm. The ISO 104 boundary dimensions are 12 mm bore, 28 mm outside diameter and 11 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "small pump axial load support", "instrument and office machine spindles", "light-duty fan axial restraint", "power tool thrust collars" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 12 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 512xx medium-light section at 12 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 28 mm OD and 11 mm height.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "The 11 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51201." ], "faq": [ { "q": "What are the dimensions of a 51201 thrust ball bearing?", "a": "A 51201 thrust ball bearing has a 12 mm bore, 28 mm outside diameter and 11 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51201 bore code work?", "a": "The last two digits of 51201 are bore code 01, giving 01 × 5 = 12 mm bore. The 28 mm outside diameter and 11 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51201 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 12 mm bore?", "a": "The 512xx is the medium-light section: 28×11 mm, 8.0 mm radial section at 12 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51102", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 15, "D_mm": 28, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 10.5, "static_load_kN": 16.8, "fatigue_load_limit_kN": 0.755, "limiting_speed_rpm": 6200, "speed_oil_rpm": 8800, "weight_g": 24, "manufacturer_designation": "51102", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51102 carries bore code 02 = 15 mm. The ISO 104 boundary dimensions are 15 mm bore, 28 mm outside diameter and 9 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "instrument and office machine spindles", "light-duty fan axial restraint", "power tool thrust collars", "small electric motor axial positioning" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 15 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 511xx light section at 15 mm bore uses a smaller 28 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "The 9 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51102." ], "faq": [ { "q": "What are the dimensions of a 51102 thrust ball bearing?", "a": "A 51102 thrust ball bearing has a 15 mm bore, 28 mm outside diameter and 9 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51102 bore code work?", "a": "The last two digits of 51102 are bore code 02, giving 02 × 5 = 15 mm bore. The 28 mm outside diameter and 9 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51102 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 15 mm bore?", "a": "The 511xx is the light section: 28×9 mm with a 6.5 mm radial section at 15 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51202", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 15, "D_mm": 32, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 16.6, "static_load_kN": 24.8, "fatigue_load_limit_kN": 1.12, "limiting_speed_rpm": 5000, "speed_oil_rpm": 7100, "weight_g": 46, "manufacturer_designation": "51202", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51202 carries bore code 02 = 15 mm. The ISO 104 boundary dimensions are 15 mm bore, 32 mm outside diameter and 12 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "power tool thrust collars", "small electric motor axial positioning", "appliance gearbox thrust washers", "small pump axial load support" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 15 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 512xx medium-light section at 15 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 32 mm OD and 12 mm height.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "The shaft washer (bore 15 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51202 thrust ball bearing?", "a": "A 51202 thrust ball bearing has a 15 mm bore, 32 mm outside diameter and 12 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51202 bore code work?", "a": "The last two digits of 51202 are bore code 02, giving 02 × 5 = 15 mm bore. The 32 mm outside diameter and 12 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51202 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 15 mm bore?", "a": "The 512xx is the medium-light section: 32×12 mm, 8.5 mm radial section at 15 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51103", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 17, "D_mm": 30, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 10.8, "static_load_kN": 18.2, "fatigue_load_limit_kN": 0.82, "limiting_speed_rpm": 6000, "speed_oil_rpm": 8500, "weight_g": 26, "manufacturer_designation": "51103", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51103 carries bore code 03 = 17 mm. The ISO 104 boundary dimensions are 17 mm bore, 30 mm outside diameter and 9 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "power tool thrust collars", "small electric motor axial positioning", "appliance gearbox thrust washers", "small pump axial load support" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 17 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 511xx light section at 17 mm bore uses a smaller 30 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Thrust ball bearings carry axial load only — never apply radial load to 51103; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51103 thrust ball bearing?", "a": "A 51103 thrust ball bearing has a 17 mm bore, 30 mm outside diameter and 9 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51103 bore code work?", "a": "The last two digits of 51103 are bore code 03, giving 03 × 5 = 17 mm bore. The 30 mm outside diameter and 9 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51103 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 17 mm bore?", "a": "The 511xx is the light section: 30×9 mm with a 6.5 mm radial section at 17 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51203", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 17, "D_mm": 35, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 17.2, "static_load_kN": 27.3, "fatigue_load_limit_kN": 1.23, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6800, "weight_g": 54, "manufacturer_designation": "51203", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51203 carries bore code 03 = 17 mm. The ISO 104 boundary dimensions are 17 mm bore, 35 mm outside diameter and 12 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "appliance gearbox thrust washers", "small pump axial load support", "instrument and office machine spindles", "light-duty fan axial restraint" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 17 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 512xx medium-light section at 17 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 35 mm OD and 12 mm height.", "The shaft washer (bore 17 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51203 thrust ball bearing?", "a": "A 51203 thrust ball bearing has a 17 mm bore, 35 mm outside diameter and 12 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51203 bore code work?", "a": "The last two digits of 51203 are bore code 03, giving 03 × 5 = 17 mm bore. The 35 mm outside diameter and 12 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51203 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 17 mm bore?", "a": "The 512xx is the medium-light section: 35×12 mm, 9.0 mm radial section at 17 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51104", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 20, "D_mm": 35, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 14.2, "static_load_kN": 24.5, "fatigue_load_limit_kN": 1.05, "limiting_speed_rpm": 5300, "speed_oil_rpm": 7500, "weight_g": 36, "manufacturer_designation": "51104", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51104 carries bore code 04 = 20 mm. The ISO 104 boundary dimensions are 20 mm bore, 35 mm outside diameter and 10 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "small pump axial load support", "instrument and office machine spindles", "light-duty fan axial restraint", "power tool thrust collars" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 20 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 511xx light section at 20 mm bore uses a smaller 35 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51104 thrust ball bearing?", "a": "A 51104 thrust ball bearing has a 20 mm bore, 35 mm outside diameter and 10 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51104 bore code work?", "a": "The last two digits of 51104 are bore code 04, giving 04 × 5 = 20 mm bore. The 35 mm outside diameter and 10 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51104 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 20 mm bore?", "a": "The 511xx is the light section: 35×10 mm with a 7.5 mm radial section at 20 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51204", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 20, "D_mm": 40, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 22.3, "static_load_kN": 37.5, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 4300, "speed_oil_rpm": 6000, "weight_g": 75, "manufacturer_designation": "51204", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51204 carries bore code 04 = 20 mm. The ISO 104 boundary dimensions are 20 mm bore, 40 mm outside diameter and 14 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "light-duty fan axial restraint", "power tool thrust collars", "small electric motor axial positioning", "appliance gearbox thrust washers" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 20 mm bore, thrust ball washers are thin and easily distorted; press the shaft washer on with a proper sleeve — never hammer it or the raceway will brinell.", "The 512xx medium-light section at 20 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 40 mm OD and 14 mm height.", "The 14 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51204.", "Thrust ball bearings carry axial load only — never apply radial load to 51204; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51204 thrust ball bearing?", "a": "A 51204 thrust ball bearing has a 20 mm bore, 40 mm outside diameter and 14 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51204 bore code work?", "a": "The last two digits of 51204 are bore code 04, giving 04 × 5 = 20 mm bore. The 40 mm outside diameter and 14 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51204 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 20 mm bore?", "a": "The 512xx is the medium-light section: 40×14 mm, 10.0 mm radial section at 20 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51305", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 25, "D_mm": 52, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 35.5, "static_load_kN": 71, "fatigue_load_limit_kN": 2.84, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4600, "weight_g": 176, "manufacturer_designation": "51305", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51305 carries bore code 05 = 25 mm. The ISO 104 boundary dimensions are 25 mm bore, 52 mm outside diameter and 18 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 25 mm bore, check shaft shoulder runout before fitting 51305; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 25 mm bore through a larger 52 mm OD and 18 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51305 thrust ball bearing?", "a": "A 51305 thrust ball bearing has a 25 mm bore, 52 mm outside diameter and 18 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51305 bore code work?", "a": "The last two digits of 51305 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 18 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51305 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 25 mm bore?", "a": "The 513xx is the medium section: 52×18 mm, 13.5 mm radial section at 25 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51405", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 25, "D_mm": 60, "B_mm": 24, "seal_type": "open", "dynamic_load_kN": 55.5, "static_load_kN": 105, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3500, "weight_g": 383, "manufacturer_designation": "51405", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51405 carries bore code 05 = 25 mm. The ISO 104 boundary dimensions are 25 mm bore, 60 mm outside diameter and 24 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, check shaft shoulder runout before fitting 51405; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 25 mm bore (60 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The shaft washer (bore 25 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51405 thrust ball bearing?", "a": "A 51405 thrust ball bearing has a 25 mm bore, 60 mm outside diameter and 24 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51405 bore code work?", "a": "The last two digits of 51405 are bore code 05, giving 05 × 5 = 25 mm bore. The 60 mm outside diameter and 24 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51405 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 25 mm bore?", "a": "The 514xx is the heavy section: 60×24 mm, 17.5 mm radial section at 25 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51105", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 25, "D_mm": 42, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 15.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4800, "speed_oil_rpm": 6800, "weight_g": 41, "manufacturer_designation": "51105", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51105 carries bore code 05 = 25 mm. The ISO 104 boundary dimensions are 25 mm bore, 42 mm outside diameter and 11 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, check shaft shoulder runout before fitting 51105; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 25 mm bore uses a smaller 42 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The shaft washer (bore 25 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51105 thrust ball bearing?", "a": "A 51105 thrust ball bearing has a 25 mm bore, 42 mm outside diameter and 11 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51105 bore code work?", "a": "The last two digits of 51105 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 11 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51105 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 25 mm bore?", "a": "The 511xx is the light section: 42×11 mm with an 8.5 mm radial section at 25 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51205", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 25, "D_mm": 47, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 26, "static_load_kN": 44, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "speed_oil_rpm": 5400, "weight_g": 110, "manufacturer_designation": "51205", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51205 carries bore code 05 = 25 mm. The ISO 104 boundary dimensions are 25 mm bore, 47 mm outside diameter and 15 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 25 mm bore, check shaft shoulder runout before fitting 51205; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 25 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 47 mm OD and 15 mm height.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51205 thrust ball bearing?", "a": "A 51205 thrust ball bearing has a 25 mm bore, 47 mm outside diameter and 15 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51205 bore code work?", "a": "The last two digits of 51205 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 15 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51205 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 25 mm bore?", "a": "The 512xx is the medium-light section: 47×15 mm, 11.0 mm radial section at 25 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51406", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 30, "D_mm": 70, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 72, "static_load_kN": 155, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 1900, "speed_oil_rpm": 2800, "weight_g": 550, "manufacturer_designation": "51406", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51406 carries bore code 06 = 30 mm. The ISO 104 boundary dimensions are 30 mm bore, 70 mm outside diameter and 28 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 30 mm bore, check shaft shoulder runout before fitting 51406; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 30 mm bore (70 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Thrust ball bearings carry axial load only — never apply radial load to 51406; the flat washers will skid and score.", "The 28 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51406." ], "faq": [ { "q": "What are the dimensions of a 51406 thrust ball bearing?", "a": "A 51406 thrust ball bearing has a 30 mm bore, 70 mm outside diameter and 28 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51406 bore code work?", "a": "The last two digits of 51406 are bore code 06, giving 06 × 5 = 30 mm bore. The 70 mm outside diameter and 28 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51406 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 30 mm bore?", "a": "The 514xx is the heavy section: 70×28 mm, 20.0 mm radial section at 30 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51106", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 30, "D_mm": 47, "B_mm": 11, "seal_type": "open", "dynamic_load_kN": 16, "static_load_kN": 33, "fatigue_load_limit_kN": 1.4, "limiting_speed_rpm": 4500, "speed_oil_rpm": 6300, "weight_g": 48, "manufacturer_designation": "51106", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51106 carries bore code 06 = 30 mm. The ISO 104 boundary dimensions are 30 mm bore, 47 mm outside diameter and 11 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, check shaft shoulder runout before fitting 51106; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 30 mm bore uses a smaller 47 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Thrust ball bearings carry axial load only — never apply radial load to 51106; the flat washers will skid and score.", "The shaft washer (bore 30 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51106 thrust ball bearing?", "a": "A 51106 thrust ball bearing has a 30 mm bore, 47 mm outside diameter and 11 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51106 bore code work?", "a": "The last two digits of 51106 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 11 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51106 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 30 mm bore?", "a": "The 511xx is the light section: 47×11 mm with an 8.5 mm radial section at 30 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51206", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 30, "D_mm": 52, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 26, "static_load_kN": 50, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3600, "speed_oil_rpm": 5100, "weight_g": 130, "manufacturer_designation": "51206", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51206 carries bore code 06 = 30 mm. The ISO 104 boundary dimensions are 30 mm bore, 52 mm outside diameter and 16 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, check shaft shoulder runout before fitting 51206; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 30 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 52 mm OD and 16 mm height.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "The 16 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51206." ], "faq": [ { "q": "What are the dimensions of a 51206 thrust ball bearing?", "a": "A 51206 thrust ball bearing has a 30 mm bore, 52 mm outside diameter and 16 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51206 bore code work?", "a": "The last two digits of 51206 are bore code 06, giving 06 × 5 = 30 mm bore. The 52 mm outside diameter and 16 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51206 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 30 mm bore?", "a": "The 512xx is the medium-light section: 52×16 mm, 11.0 mm radial section at 30 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51306", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 30, "D_mm": 60, "B_mm": 21, "seal_type": "open", "dynamic_load_kN": 43, "static_load_kN": 86, "fatigue_load_limit_kN": 3.1, "limiting_speed_rpm": 2800, "speed_oil_rpm": 4000, "weight_g": 269, "manufacturer_designation": "51306", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51306 carries bore code 06 = 30 mm. The ISO 104 boundary dimensions are 30 mm bore, 60 mm outside diameter and 21 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 30 mm bore, check shaft shoulder runout before fitting 51306; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 30 mm bore through a larger 60 mm OD and 21 mm height; the heavier assembly also trades away some speed versus a 512xx.", "The 21 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51306.", "The shaft washer (bore 30 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51306 thrust ball bearing?", "a": "A 51306 thrust ball bearing has a 30 mm bore, 60 mm outside diameter and 21 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51306 bore code work?", "a": "The last two digits of 51306 are bore code 06, giving 06 × 5 = 30 mm bore. The 60 mm outside diameter and 21 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51306 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 30 mm bore?", "a": "The 513xx is the medium section: 60×21 mm, 15.0 mm radial section at 30 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51407", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 35, "D_mm": 80, "B_mm": 32, "seal_type": "open", "dynamic_load_kN": 87, "static_load_kN": 155, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 1900, "speed_oil_rpm": 2800, "weight_g": 759, "manufacturer_designation": "51407", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51407 carries bore code 07 = 35 mm. The ISO 104 boundary dimensions are 35 mm bore, 80 mm outside diameter and 32 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 35 mm bore, check shaft shoulder runout before fitting 51407; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 35 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51407 thrust ball bearing?", "a": "A 51407 thrust ball bearing has a 35 mm bore, 80 mm outside diameter and 32 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51407 bore code work?", "a": "The last two digits of 51407 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 32 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51407 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 35 mm bore?", "a": "The 514xx is the heavy section: 80×32 mm, 22.5 mm radial section at 35 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51107", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 35, "D_mm": 52, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 20.4, "static_load_kN": 44.5, "fatigue_load_limit_kN": 2.02, "limiting_speed_rpm": 3900, "speed_oil_rpm": 5600, "weight_g": 85, "manufacturer_designation": "51107", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51107 carries bore code 07 = 35 mm. The ISO 104 boundary dimensions are 35 mm bore, 52 mm outside diameter and 12 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 35 mm bore, check shaft shoulder runout before fitting 51107; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 35 mm bore uses a smaller 52 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Thrust ball bearings carry axial load only — never apply radial load to 51107; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51107 thrust ball bearing?", "a": "A 51107 thrust ball bearing has a 35 mm bore, 52 mm outside diameter and 12 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51107 bore code work?", "a": "The last two digits of 51107 are bore code 07, giving 07 × 5 = 35 mm bore. The 52 mm outside diameter and 12 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51107 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 35 mm bore?", "a": "The 511xx is the light section: 52×12 mm with an 8.5 mm radial section at 35 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51207", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 35, "D_mm": 62, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 39, "static_load_kN": 78, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 2900, "speed_oil_rpm": 4200, "weight_g": 215, "manufacturer_designation": "51207", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51207 carries bore code 07 = 35 mm. The ISO 104 boundary dimensions are 35 mm bore, 62 mm outside diameter and 18 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, check shaft shoulder runout before fitting 51207; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 35 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 62 mm OD and 18 mm height.", "The shaft washer (bore 35 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51207 thrust ball bearing?", "a": "A 51207 thrust ball bearing has a 35 mm bore, 62 mm outside diameter and 18 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51207 bore code work?", "a": "The last two digits of 51207 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 18 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51207 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 35 mm bore?", "a": "The 512xx is the medium-light section: 62×18 mm, 13.5 mm radial section at 35 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51307", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 35, "D_mm": 68, "B_mm": 24, "seal_type": "open", "dynamic_load_kN": 55.5, "static_load_kN": 105, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3500, "weight_g": 383, "manufacturer_designation": "51307", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51307 carries bore code 07 = 35 mm. The ISO 104 boundary dimensions are 35 mm bore, 68 mm outside diameter and 24 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, check shaft shoulder runout before fitting 51307; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 35 mm bore through a larger 68 mm OD and 24 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "Thrust ball bearings carry axial load only — never apply radial load to 51307; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51307 thrust ball bearing?", "a": "A 51307 thrust ball bearing has a 35 mm bore, 68 mm outside diameter and 24 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51307 bore code work?", "a": "The last two digits of 51307 are bore code 07, giving 07 × 5 = 35 mm bore. The 68 mm outside diameter and 24 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51307 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 35 mm bore?", "a": "The 513xx is the medium section: 68×24 mm, 16.5 mm radial section at 35 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51408", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 40, "D_mm": 90, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 112, "static_load_kN": 205, "fatigue_load_limit_kN": 9.25, "limiting_speed_rpm": 1700, "speed_oil_rpm": 2500, "weight_g": 1080, "manufacturer_designation": "51408", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51408 carries bore code 08 = 40 mm. The ISO 104 boundary dimensions are 40 mm bore, 90 mm outside diameter and 36 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, check shaft shoulder runout before fitting 51408; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 40 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The 36 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51408.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51408 thrust ball bearing?", "a": "A 51408 thrust ball bearing has a 40 mm bore, 90 mm outside diameter and 36 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51408 bore code work?", "a": "The last two digits of 51408 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 36 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51408 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 40 mm bore?", "a": "The 514xx is the heavy section: 90×36 mm, 25.0 mm radial section at 40 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51108", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 40, "D_mm": 60, "B_mm": 13, "seal_type": "open", "dynamic_load_kN": 26.9, "static_load_kN": 63, "fatigue_load_limit_kN": 2.84, "limiting_speed_rpm": 3500, "speed_oil_rpm": 5000, "weight_g": 125, "manufacturer_designation": "51108", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51108 carries bore code 08 = 40 mm. The ISO 104 boundary dimensions are 40 mm bore, 60 mm outside diameter and 13 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, check shaft shoulder runout before fitting 51108; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 40 mm bore uses a smaller 60 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The 13 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51108.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51108 thrust ball bearing?", "a": "A 51108 thrust ball bearing has a 40 mm bore, 60 mm outside diameter and 13 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51108 bore code work?", "a": "The last two digits of 51108 are bore code 08, giving 08 × 5 = 40 mm bore. The 60 mm outside diameter and 13 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51108 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 40 mm bore?", "a": "The 511xx is the light section: 60×13 mm with a 10.0 mm radial section at 40 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51208", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 40, "D_mm": 68, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 47, "static_load_kN": 98.5, "fatigue_load_limit_kN": 4.45, "limiting_speed_rpm": 2700, "speed_oil_rpm": 3900, "weight_g": 276, "manufacturer_designation": "51208", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51208 carries bore code 08 = 40 mm. The ISO 104 boundary dimensions are 40 mm bore, 68 mm outside diameter and 19 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 40 mm bore, check shaft shoulder runout before fitting 51208; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 40 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 68 mm OD and 19 mm height.", "Thrust ball bearings carry axial load only — never apply radial load to 51208; the flat washers will skid and score.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51208 thrust ball bearing?", "a": "A 51208 thrust ball bearing has a 40 mm bore, 68 mm outside diameter and 19 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51208 bore code work?", "a": "The last two digits of 51208 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 19 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51208 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 40 mm bore?", "a": "The 512xx is the medium-light section: 68×19 mm, 14.0 mm radial section at 40 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51308", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 40, "D_mm": 78, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 69, "static_load_kN": 135, "fatigue_load_limit_kN": 6.05, "limiting_speed_rpm": 2200, "speed_oil_rpm": 3100, "weight_g": 548, "manufacturer_designation": "51308", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51308 carries bore code 08 = 40 mm. The ISO 104 boundary dimensions are 40 mm bore, 78 mm outside diameter and 26 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, check shaft shoulder runout before fitting 51308; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 40 mm bore through a larger 78 mm OD and 26 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51308 thrust ball bearing?", "a": "A 51308 thrust ball bearing has a 40 mm bore, 78 mm outside diameter and 26 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51308 bore code work?", "a": "The last two digits of 51308 are bore code 08, giving 08 × 5 = 40 mm bore. The 78 mm outside diameter and 26 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51308 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 40 mm bore?", "a": "The 513xx is the medium section: 78×26 mm, 19.0 mm radial section at 40 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51409", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 45, "D_mm": 100, "B_mm": 39, "seal_type": "open", "dynamic_load_kN": 130, "static_load_kN": 242, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 1600, "speed_oil_rpm": 2200, "weight_g": 1430, "manufacturer_designation": "51409", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51409 carries bore code 09 = 45 mm. The ISO 104 boundary dimensions are 45 mm bore, 100 mm outside diameter and 39 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, check shaft shoulder runout before fitting 51409; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 45 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "The shaft washer (bore 45 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51409 thrust ball bearing?", "a": "A 51409 thrust ball bearing has a 45 mm bore, 100 mm outside diameter and 39 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51409 bore code work?", "a": "The last two digits of 51409 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 39 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51409 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 45 mm bore?", "a": "The 514xx is the heavy section: 100×39 mm, 27.5 mm radial section at 45 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51109", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 45, "D_mm": 65, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 27.9, "static_load_kN": 69, "fatigue_load_limit_kN": 3.1, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4600, "weight_g": 148, "manufacturer_designation": "51109", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51109 carries bore code 09 = 45 mm. The ISO 104 boundary dimensions are 45 mm bore, 65 mm outside diameter and 14 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 45 mm bore, check shaft shoulder runout before fitting 51109; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 45 mm bore uses a smaller 65 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "The 14 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51109." ], "faq": [ { "q": "What are the dimensions of a 51109 thrust ball bearing?", "a": "A 51109 thrust ball bearing has a 45 mm bore, 65 mm outside diameter and 14 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51109 bore code work?", "a": "The last two digits of 51109 are bore code 09, giving 09 × 5 = 45 mm bore. The 65 mm outside diameter and 14 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51109 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 45 mm bore?", "a": "The 511xx is the light section: 65×14 mm with a 10.0 mm radial section at 45 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51209", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 45, "D_mm": 73, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 47.5, "static_load_kN": 105, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2600, "speed_oil_rpm": 3700, "weight_g": 317, "manufacturer_designation": "51209", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51209 carries bore code 09 = 45 mm. The ISO 104 boundary dimensions are 45 mm bore, 73 mm outside diameter and 20 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, check shaft shoulder runout before fitting 51209; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 45 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 73 mm OD and 20 mm height.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "The shaft washer (bore 45 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51209 thrust ball bearing?", "a": "A 51209 thrust ball bearing has a 45 mm bore, 73 mm outside diameter and 20 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51209 bore code work?", "a": "The last two digits of 51209 are bore code 09, giving 09 × 5 = 45 mm bore. The 73 mm outside diameter and 20 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51209 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 45 mm bore?", "a": "The 512xx is the medium-light section: 73×20 mm, 14.0 mm radial section at 45 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51309", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 45, "D_mm": 85, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 80, "static_load_kN": 163, "fatigue_load_limit_kN": 7.35, "limiting_speed_rpm": 2000, "speed_oil_rpm": 2900, "weight_g": 684, "manufacturer_designation": "51309", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51309 carries bore code 09 = 45 mm. The ISO 104 boundary dimensions are 45 mm bore, 85 mm outside diameter and 28 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 45 mm bore, check shaft shoulder runout before fitting 51309; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 45 mm bore through a larger 85 mm OD and 28 mm height; the heavier assembly also trades away some speed versus a 512xx.", "The shaft washer (bore 45 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "The 28 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51309." ], "faq": [ { "q": "What are the dimensions of a 51309 thrust ball bearing?", "a": "A 51309 thrust ball bearing has a 45 mm bore, 85 mm outside diameter and 28 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51309 bore code work?", "a": "The last two digits of 51309 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 28 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51309 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 45 mm bore?", "a": "The 513xx is the medium section: 85×28 mm, 20.0 mm radial section at 45 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51410", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 50, "D_mm": 110, "B_mm": 43, "seal_type": "open", "dynamic_load_kN": 159, "static_load_kN": 318, "fatigue_load_limit_kN": 14.2, "limiting_speed_rpm": 1400, "speed_oil_rpm": 2000, "weight_g": 1970, "manufacturer_designation": "51410", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51410 carries bore code 10 = 50 mm. The ISO 104 boundary dimensions are 50 mm bore, 110 mm outside diameter and 43 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 50 mm bore, check shaft shoulder runout before fitting 51410; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 514xx heavy section at 50 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Thrust ball bearings carry axial load only — never apply radial load to 51410; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51410 thrust ball bearing?", "a": "A 51410 thrust ball bearing has a 50 mm bore, 110 mm outside diameter and 43 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51410 bore code work?", "a": "The last two digits of 51410 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 43 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51410 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 50 mm bore?", "a": "The 514xx is the heavy section: 110×43 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51110", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 50, "D_mm": 70, "B_mm": 14, "seal_type": "open", "dynamic_load_kN": 28.8, "static_load_kN": 75.5, "fatigue_load_limit_kN": 3.4, "limiting_speed_rpm": 3100, "speed_oil_rpm": 4500, "weight_g": 161, "manufacturer_designation": "51110", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51110 carries bore code 10 = 50 mm. The ISO 104 boundary dimensions are 50 mm bore, 70 mm outside diameter and 14 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox axial load management", "conveyor drive thrust washers", "agricultural equipment spindle thrust", "industrial fan axial restraint" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 50 mm bore, check shaft shoulder runout before fitting 51110; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 511xx light section at 50 mm bore uses a smaller 70 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51110 thrust ball bearing?", "a": "A 51110 thrust ball bearing has a 50 mm bore, 70 mm outside diameter and 14 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51110 bore code work?", "a": "The last two digits of 51110 are bore code 10, giving 10 × 5 = 50 mm bore. The 70 mm outside diameter and 14 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51110 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 50 mm bore?", "a": "The 511xx is the light section: 70×14 mm with a 10.0 mm radial section at 50 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51210", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 50, "D_mm": 78, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 48.5, "static_load_kN": 111, "fatigue_load_limit_kN": 5.05, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3400, "weight_g": 378, "manufacturer_designation": "51210", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51210 carries bore code 10 = 50 mm. The ISO 104 boundary dimensions are 50 mm bore, 78 mm outside diameter and 22 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "agricultural equipment spindle thrust", "industrial fan axial restraint", "electric motor axial positioning", "pump and compressor thrust support" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 50 mm bore, check shaft shoulder runout before fitting 51210; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 512xx medium-light section at 50 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 78 mm OD and 22 mm height.", "The 22 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51210.", "Thrust ball bearings carry axial load only — never apply radial load to 51210; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51210 thrust ball bearing?", "a": "A 51210 thrust ball bearing has a 50 mm bore, 78 mm outside diameter and 22 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51210 bore code work?", "a": "The last two digits of 51210 are bore code 10, giving 10 × 5 = 50 mm bore. The 78 mm outside diameter and 22 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51210 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 50 mm bore?", "a": "The 512xx is the medium-light section: 78×22 mm, 14.0 mm radial section at 50 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51310", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 50, "D_mm": 95, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 96.5, "static_load_kN": 202, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 1800, "speed_oil_rpm": 2600, "weight_g": 951, "manufacturer_designation": "51310", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51310 carries bore code 10 = 50 mm. The ISO 104 boundary dimensions are 50 mm bore, 95 mm outside diameter and 31 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "electric motor axial positioning", "pump and compressor thrust support", "gearbox axial load management", "conveyor drive thrust washers" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 50 mm bore, check shaft shoulder runout before fitting 51310; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.", "The 513xx medium section gains rating at 50 mm bore through a larger 95 mm OD and 31 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Thrust ball bearings carry axial load only — never apply radial load to 51310; the flat washers will skid and score.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51310 thrust ball bearing?", "a": "A 51310 thrust ball bearing has a 50 mm bore, 95 mm outside diameter and 31 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51310 bore code work?", "a": "The last two digits of 51310 are bore code 10, giving 10 × 5 = 50 mm bore. The 95 mm outside diameter and 31 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51310 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 50 mm bore?", "a": "The 513xx is the medium section: 95×31 mm, 22.5 mm radial section at 50 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51411", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 55, "D_mm": 120, "B_mm": 48, "seal_type": "open", "dynamic_load_kN": 176, "static_load_kN": 395, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 1300, "speed_oil_rpm": 1800, "weight_g": 2720, "manufacturer_designation": "51411", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51411 carries bore code 11 = 55 mm. The ISO 104 boundary dimensions are 55 mm bore, 120 mm outside diameter and 48 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 55 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 55 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The shaft washer (bore 55 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51411 thrust ball bearing?", "a": "A 51411 thrust ball bearing has a 55 mm bore, 120 mm outside diameter and 48 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51411 bore code work?", "a": "The last two digits of 51411 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 48 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51411 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 55 mm bore?", "a": "The 514xx is the heavy section: 120×48 mm, 32.5 mm radial section at 55 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51111", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 55, "D_mm": 78, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 35.5, "static_load_kN": 85, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 2800, "speed_oil_rpm": 4000, "weight_g": 247, "manufacturer_designation": "51111", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51111 carries bore code 11 = 55 mm. The ISO 104 boundary dimensions are 55 mm bore, 78 mm outside diameter and 16 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 55 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 55 mm bore uses a smaller 78 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The shaft washer (bore 55 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51111 thrust ball bearing?", "a": "A 51111 thrust ball bearing has a 55 mm bore, 78 mm outside diameter and 16 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51111 bore code work?", "a": "The last two digits of 51111 are bore code 11, giving 11 × 5 = 55 mm bore. The 78 mm outside diameter and 16 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51111 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 55 mm bore?", "a": "The 511xx is the light section: 78×16 mm with an 11.5 mm radial section at 55 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51211", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 55, "D_mm": 90, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 69.5, "static_load_kN": 150, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 2200, "speed_oil_rpm": 3100, "weight_g": 590, "manufacturer_designation": "51211", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51211 carries bore code 11 = 55 mm. The ISO 104 boundary dimensions are 55 mm bore, 90 mm outside diameter and 25 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 55 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 55 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 90 mm OD and 25 mm height.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51211 thrust ball bearing?", "a": "A 51211 thrust ball bearing has a 55 mm bore, 90 mm outside diameter and 25 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51211 bore code work?", "a": "The last two digits of 51211 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 25 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51211 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 55 mm bore?", "a": "The 512xx is the medium-light section: 90×25 mm, 17.5 mm radial section at 55 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51311", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 55, "D_mm": 105, "B_mm": 35, "seal_type": "open", "dynamic_load_kN": 119, "static_load_kN": 246, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1600, "speed_oil_rpm": 2300, "weight_g": 1290, "manufacturer_designation": "51311", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51311 carries bore code 11 = 55 mm. The ISO 104 boundary dimensions are 55 mm bore, 105 mm outside diameter and 35 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 55 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 55 mm bore through a larger 105 mm OD and 35 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51311 thrust ball bearing?", "a": "A 51311 thrust ball bearing has a 55 mm bore, 105 mm outside diameter and 35 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51311 bore code work?", "a": "The last two digits of 51311 are bore code 11, giving 11 × 5 = 55 mm bore. The 105 mm outside diameter and 35 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51311 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 55 mm bore?", "a": "The 513xx is the medium section: 105×35 mm, 25.0 mm radial section at 55 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51412", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 60, "D_mm": 130, "B_mm": 51, "seal_type": "open", "dynamic_load_kN": 222, "static_load_kN": 475, "fatigue_load_limit_kN": 19.9, "limiting_speed_rpm": 1100, "speed_oil_rpm": 1600, "weight_g": 3490, "manufacturer_designation": "51412", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51412 carries bore code 12 = 60 mm. The ISO 104 boundary dimensions are 60 mm bore, 130 mm outside diameter and 51 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 60 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 60 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Thrust ball bearings carry axial load only — never apply radial load to 51412; the flat washers will skid and score.", "The 51 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51412." ], "faq": [ { "q": "What are the dimensions of a 51412 thrust ball bearing?", "a": "A 51412 thrust ball bearing has a 60 mm bore, 130 mm outside diameter and 51 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51412 bore code work?", "a": "The last two digits of 51412 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 51 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51412 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 60 mm bore?", "a": "The 514xx is the heavy section: 130×51 mm, 35.0 mm radial section at 60 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51112", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 60, "D_mm": 85, "B_mm": 17, "seal_type": "open", "dynamic_load_kN": 41.5, "static_load_kN": 113, "fatigue_load_limit_kN": 5.1, "limiting_speed_rpm": 2600, "speed_oil_rpm": 3700, "weight_g": 296, "manufacturer_designation": "51112", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51112 carries bore code 12 = 60 mm. The ISO 104 boundary dimensions are 60 mm bore, 85 mm outside diameter and 17 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 60 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 60 mm bore uses a smaller 85 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Thrust ball bearings carry axial load only — never apply radial load to 51112; the flat washers will skid and score.", "The shaft washer (bore 60 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51112 thrust ball bearing?", "a": "A 51112 thrust ball bearing has a 60 mm bore, 85 mm outside diameter and 17 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51112 bore code work?", "a": "The last two digits of 51112 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 17 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51112 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 60 mm bore?", "a": "The 511xx is the light section: 85×17 mm with a 12.5 mm radial section at 60 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51212", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 60, "D_mm": 95, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 73.5, "static_load_kN": 153, "fatigue_load_limit_kN": 8.35, "limiting_speed_rpm": 2000, "speed_oil_rpm": 2800, "weight_g": 676, "manufacturer_designation": "51212", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51212 carries bore code 12 = 60 mm. The ISO 104 boundary dimensions are 60 mm bore, 95 mm outside diameter and 26 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 60 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 60 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 95 mm OD and 26 mm height.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "The 26 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51212." ], "faq": [ { "q": "What are the dimensions of a 51212 thrust ball bearing?", "a": "A 51212 thrust ball bearing has a 60 mm bore, 95 mm outside diameter and 26 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51212 bore code work?", "a": "The last two digits of 51212 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 26 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51212 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 60 mm bore?", "a": "The 512xx is the medium-light section: 95×26 mm, 17.5 mm radial section at 60 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51312", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 60, "D_mm": 110, "B_mm": 35, "seal_type": "open", "dynamic_load_kN": 125, "static_load_kN": 268, "fatigue_load_limit_kN": 12.1, "limiting_speed_rpm": 1500, "speed_oil_rpm": 2200, "weight_g": 1470, "manufacturer_designation": "51312", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51312 carries bore code 12 = 60 mm. The ISO 104 boundary dimensions are 60 mm bore, 110 mm outside diameter and 35 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 60 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 60 mm bore through a larger 110 mm OD and 35 mm height; the heavier assembly also trades away some speed versus a 512xx.", "The 35 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51312.", "The shaft washer (bore 60 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51312 thrust ball bearing?", "a": "A 51312 thrust ball bearing has a 60 mm bore, 110 mm outside diameter and 35 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51312 bore code work?", "a": "The last two digits of 51312 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 35 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51312 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 60 mm bore?", "a": "The 513xx is the medium section: 110×35 mm, 25.0 mm radial section at 60 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51413", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 65, "D_mm": 140, "B_mm": 56, "seal_type": "open", "dynamic_load_kN": 255, "static_load_kN": 555, "fatigue_load_limit_kN": 23.2, "limiting_speed_rpm": 1000, "speed_oil_rpm": 1500, "weight_g": 4470, "manufacturer_designation": "51413", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51413 carries bore code 13 = 65 mm. The ISO 104 boundary dimensions are 65 mm bore, 140 mm outside diameter and 56 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 65 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 65 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51413 thrust ball bearing?", "a": "A 51413 thrust ball bearing has a 65 mm bore, 140 mm outside diameter and 56 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51413 bore code work?", "a": "The last two digits of 51413 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 56 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51413 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 65 mm bore?", "a": "The 514xx is the heavy section: 140×56 mm, 37.5 mm radial section at 65 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51113", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 65, "D_mm": 90, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 44, "static_load_kN": 122, "fatigue_load_limit_kN": 5.6, "limiting_speed_rpm": 2400, "speed_oil_rpm": 3500, "weight_g": 350, "manufacturer_designation": "51113", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51113 carries bore code 13 = 65 mm. The ISO 104 boundary dimensions are 65 mm bore, 90 mm outside diameter and 18 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 65 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 65 mm bore uses a smaller 90 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Thrust ball bearings carry axial load only — never apply radial load to 51113; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51113 thrust ball bearing?", "a": "A 51113 thrust ball bearing has a 65 mm bore, 90 mm outside diameter and 18 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51113 bore code work?", "a": "The last two digits of 51113 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 18 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51113 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 65 mm bore?", "a": "The 511xx is the light section: 90×18 mm with a 12.5 mm radial section at 65 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51213", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 65, "D_mm": 100, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 75.5, "static_load_kN": 168, "fatigue_load_limit_kN": 9.2, "limiting_speed_rpm": 1900, "speed_oil_rpm": 2700, "weight_g": 780, "manufacturer_designation": "51213", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51213 carries bore code 13 = 65 mm. The ISO 104 boundary dimensions are 65 mm bore, 100 mm outside diameter and 27 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 65 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 65 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 100 mm OD and 27 mm height.", "The shaft washer (bore 65 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51213 thrust ball bearing?", "a": "A 51213 thrust ball bearing has a 65 mm bore, 100 mm outside diameter and 27 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51213 bore code work?", "a": "The last two digits of 51213 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 27 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51213 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 65 mm bore?", "a": "The 512xx is the medium-light section: 100×27 mm, 17.5 mm radial section at 65 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51313", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 65, "D_mm": 115, "B_mm": 36, "seal_type": "open", "dynamic_load_kN": 132, "static_load_kN": 280, "fatigue_load_limit_kN": 13, "limiting_speed_rpm": 1400, "speed_oil_rpm": 2000, "weight_g": 1720, "manufacturer_designation": "51313", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51313 carries bore code 13 = 65 mm. The ISO 104 boundary dimensions are 65 mm bore, 115 mm outside diameter and 36 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 65 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 65 mm bore through a larger 115 mm OD and 36 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "Thrust ball bearings carry axial load only — never apply radial load to 51313; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51313 thrust ball bearing?", "a": "A 51313 thrust ball bearing has a 65 mm bore, 115 mm outside diameter and 36 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51313 bore code work?", "a": "The last two digits of 51313 are bore code 13, giving 13 × 5 = 65 mm bore. The 115 mm outside diameter and 36 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51313 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 65 mm bore?", "a": "The 513xx is the medium section: 115×36 mm, 25.0 mm radial section at 65 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51414", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 70, "D_mm": 150, "B_mm": 60, "seal_type": "open", "dynamic_load_kN": 285, "static_load_kN": 630, "fatigue_load_limit_kN": 26.2, "limiting_speed_rpm": 940, "speed_oil_rpm": 1400, "weight_g": 5480, "manufacturer_designation": "51414", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51414 carries bore code 14 = 70 mm. The ISO 104 boundary dimensions are 70 mm bore, 150 mm outside diameter and 60 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 70 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 70 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The 60 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51414.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51414 thrust ball bearing?", "a": "A 51414 thrust ball bearing has a 70 mm bore, 150 mm outside diameter and 60 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51414 bore code work?", "a": "The last two digits of 51414 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 60 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51414 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 70 mm bore?", "a": "The 514xx is the heavy section: 150×60 mm, 40.0 mm radial section at 70 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51114", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 70, "D_mm": 95, "B_mm": 18, "seal_type": "open", "dynamic_load_kN": 45, "static_load_kN": 134, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 2300, "speed_oil_rpm": 3200, "weight_g": 370, "manufacturer_designation": "51114", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51114 carries bore code 14 = 70 mm. The ISO 104 boundary dimensions are 70 mm bore, 95 mm outside diameter and 18 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 70 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 70 mm bore uses a smaller 95 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The 18 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51114.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51114 thrust ball bearing?", "a": "A 51114 thrust ball bearing has a 70 mm bore, 95 mm outside diameter and 18 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51114 bore code work?", "a": "The last two digits of 51114 are bore code 14, giving 14 × 5 = 70 mm bore. The 95 mm outside diameter and 18 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51114 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 70 mm bore?", "a": "The 511xx is the light section: 95×18 mm with a 12.5 mm radial section at 70 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51214", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 70, "D_mm": 105, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 80, "static_load_kN": 185, "fatigue_load_limit_kN": 10.2, "limiting_speed_rpm": 1800, "speed_oil_rpm": 2500, "weight_g": 840, "manufacturer_designation": "51214", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51214 carries bore code 14 = 70 mm. The ISO 104 boundary dimensions are 70 mm bore, 105 mm outside diameter and 27 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 70 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 70 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 105 mm OD and 27 mm height.", "Thrust ball bearings carry axial load only — never apply radial load to 51214; the flat washers will skid and score.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51214 thrust ball bearing?", "a": "A 51214 thrust ball bearing has a 70 mm bore, 105 mm outside diameter and 27 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51214 bore code work?", "a": "The last two digits of 51214 are bore code 14, giving 14 × 5 = 70 mm bore. The 105 mm outside diameter and 27 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51214 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 70 mm bore?", "a": "The 512xx is the medium-light section: 105×27 mm, 17.5 mm radial section at 70 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51314", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 70, "D_mm": 125, "B_mm": 40, "seal_type": "open", "dynamic_load_kN": 160, "static_load_kN": 325, "fatigue_load_limit_kN": 15.2, "limiting_speed_rpm": 1300, "speed_oil_rpm": 1800, "weight_g": 2330, "manufacturer_designation": "51314", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51314 carries bore code 14 = 70 mm. The ISO 104 boundary dimensions are 70 mm bore, 125 mm outside diameter and 40 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 70 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 70 mm bore through a larger 125 mm OD and 40 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51314 thrust ball bearing?", "a": "A 51314 thrust ball bearing has a 70 mm bore, 125 mm outside diameter and 40 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51314 bore code work?", "a": "The last two digits of 51314 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 40 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51314 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 70 mm bore?", "a": "The 513xx is the medium section: 125×40 mm, 27.5 mm radial section at 70 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51415", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 75, "D_mm": 160, "B_mm": 65, "seal_type": "open", "dynamic_load_kN": 325, "static_load_kN": 750, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 890, "speed_oil_rpm": 1300, "weight_g": 7770, "manufacturer_designation": "51415", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51415 carries bore code 15 = 75 mm. The ISO 104 boundary dimensions are 75 mm bore, 160 mm outside diameter and 65 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 75 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 75 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "The shaft washer (bore 75 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51415 thrust ball bearing?", "a": "A 51415 thrust ball bearing has a 75 mm bore, 160 mm outside diameter and 65 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51415 bore code work?", "a": "The last two digits of 51415 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 65 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51415 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 75 mm bore?", "a": "The 514xx is the heavy section: 160×65 mm, 42.5 mm radial section at 75 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51115", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 75, "D_mm": 100, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 46, "static_load_kN": 140, "fatigue_load_limit_kN": 6.45, "limiting_speed_rpm": 2200, "speed_oil_rpm": 3100, "weight_g": 400, "manufacturer_designation": "51115", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51115 carries bore code 15 = 75 mm. The ISO 104 boundary dimensions are 75 mm bore, 100 mm outside diameter and 19 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 75 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 75 mm bore uses a smaller 100 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "The 19 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51115." ], "faq": [ { "q": "What are the dimensions of a 51115 thrust ball bearing?", "a": "A 51115 thrust ball bearing has a 75 mm bore, 100 mm outside diameter and 19 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51115 bore code work?", "a": "The last two digits of 51115 are bore code 15, giving 15 × 5 = 75 mm bore. The 100 mm outside diameter and 19 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51115 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 75 mm bore?", "a": "The 511xx is the light section: 100×19 mm with a 12.5 mm radial section at 75 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51215", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 75, "D_mm": 110, "B_mm": 27, "seal_type": "open", "dynamic_load_kN": 80.5, "static_load_kN": 190, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 1700, "speed_oil_rpm": 2400, "weight_g": 920, "manufacturer_designation": "51215", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51215 carries bore code 15 = 75 mm. The ISO 104 boundary dimensions are 75 mm bore, 110 mm outside diameter and 27 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 75 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 75 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 110 mm OD and 27 mm height.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "The shaft washer (bore 75 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51215 thrust ball bearing?", "a": "A 51215 thrust ball bearing has a 75 mm bore, 110 mm outside diameter and 27 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51215 bore code work?", "a": "The last two digits of 51215 are bore code 15, giving 15 × 5 = 75 mm bore. The 110 mm outside diameter and 27 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51215 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 75 mm bore?", "a": "The 512xx is the medium-light section: 110×27 mm, 17.5 mm radial section at 75 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51315", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 75, "D_mm": 135, "B_mm": 44, "seal_type": "open", "dynamic_load_kN": 171, "static_load_kN": 395, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 1300, "speed_oil_rpm": 1800, "weight_g": 2610, "manufacturer_designation": "51315", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51315 carries bore code 15 = 75 mm. The ISO 104 boundary dimensions are 75 mm bore, 135 mm outside diameter and 44 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 75 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 75 mm bore through a larger 135 mm OD and 44 mm height; the heavier assembly also trades away some speed versus a 512xx.", "The shaft washer (bore 75 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "The 44 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51315." ], "faq": [ { "q": "What are the dimensions of a 51315 thrust ball bearing?", "a": "A 51315 thrust ball bearing has a 75 mm bore, 135 mm outside diameter and 44 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51315 bore code work?", "a": "The last two digits of 51315 are bore code 15, giving 15 × 5 = 75 mm bore. The 135 mm outside diameter and 44 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51315 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 75 mm bore?", "a": "The 513xx is the medium section: 135×44 mm, 30.0 mm radial section at 75 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51416", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 80, "D_mm": 170, "B_mm": 68, "seal_type": "open", "dynamic_load_kN": 270, "static_load_kN": 620, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 890, "speed_oil_rpm": 1300, "weight_g": 7770, "manufacturer_designation": "51416", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51416 carries bore code 16 = 80 mm. The ISO 104 boundary dimensions are 80 mm bore, 170 mm outside diameter and 68 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "At a 80 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 80 mm bore (170 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Thrust ball bearings carry axial load only — never apply radial load to 51416; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51416 thrust ball bearing?", "a": "A 51416 thrust ball bearing has a 80 mm bore, 170 mm outside diameter and 68 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51416 bore code work?", "a": "The last two digits of 51416 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 68 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51416 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 80 mm bore?", "a": "The 514xx is the heavy section: 170×68 mm, 45.0 mm radial section at 80 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51116", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 80, "D_mm": 105, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 46.5, "static_load_kN": 150, "fatigue_load_limit_kN": 6.8, "limiting_speed_rpm": 2100, "speed_oil_rpm": 3000, "weight_g": 422, "manufacturer_designation": "51116", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51116 carries bore code 16 = 80 mm. The ISO 104 boundary dimensions are 80 mm bore, 105 mm outside diameter and 19 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 80 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 80 mm bore uses a smaller 105 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51116 thrust ball bearing?", "a": "A 51116 thrust ball bearing has a 80 mm bore, 105 mm outside diameter and 19 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51116 bore code work?", "a": "The last two digits of 51116 are bore code 16, giving 16 × 5 = 80 mm bore. The 105 mm outside diameter and 19 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51116 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 80 mm bore?", "a": "The 511xx is the light section: 105×19 mm with a 12.5 mm radial section at 80 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51216", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 80, "D_mm": 115, "B_mm": 28, "seal_type": "open", "dynamic_load_kN": 95.5, "static_load_kN": 264, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 1600, "speed_oil_rpm": 2200, "weight_g": 1250, "manufacturer_designation": "51216", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51216 carries bore code 16 = 80 mm. The ISO 104 boundary dimensions are 80 mm bore, 115 mm outside diameter and 28 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 80 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 80 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 115 mm OD and 28 mm height.", "The 28 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51216.", "Thrust ball bearings carry axial load only — never apply radial load to 51216; the flat washers will skid and score." ], "faq": [ { "q": "What are the dimensions of a 51216 thrust ball bearing?", "a": "A 51216 thrust ball bearing has a 80 mm bore, 115 mm outside diameter and 28 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51216 bore code work?", "a": "The last two digits of 51216 are bore code 16, giving 16 × 5 = 80 mm bore. The 115 mm outside diameter and 28 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51216 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 80 mm bore?", "a": "The 512xx is the medium-light section: 115×28 mm, 17.5 mm radial section at 80 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51316", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 80, "D_mm": 140, "B_mm": 44, "seal_type": "open", "dynamic_load_kN": 176, "static_load_kN": 425, "fatigue_load_limit_kN": 18.2, "limiting_speed_rpm": 1200, "speed_oil_rpm": 1600, "weight_g": 2720, "manufacturer_designation": "51316", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51316 carries bore code 16 = 80 mm. The ISO 104 boundary dimensions are 80 mm bore, 140 mm outside diameter and 44 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 80 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 80 mm bore through a larger 140 mm OD and 44 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Thrust ball bearings carry axial load only — never apply radial load to 51316; the flat washers will skid and score.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure." ], "faq": [ { "q": "What are the dimensions of a 51316 thrust ball bearing?", "a": "A 51316 thrust ball bearing has a 80 mm bore, 140 mm outside diameter and 44 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51316 bore code work?", "a": "The last two digits of 51316 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 44 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51316 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 80 mm bore?", "a": "The 513xx is the medium section: 140×44 mm, 30.0 mm radial section at 80 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51417", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 85, "D_mm": 180, "B_mm": 72, "seal_type": "open", "dynamic_load_kN": 288, "static_load_kN": 685, "fatigue_load_limit_kN": 26.8, "limiting_speed_rpm": 840, "speed_oil_rpm": 1200, "weight_g": 9170, "manufacturer_designation": "51417", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51417 carries bore code 17 = 85 mm. The ISO 104 boundary dimensions are 85 mm bore, 180 mm outside diameter and 72 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 85 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 85 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The shaft washer (bore 85 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51417 thrust ball bearing?", "a": "A 51417 thrust ball bearing has a 85 mm bore, 180 mm outside diameter and 72 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51417 bore code work?", "a": "The last two digits of 51417 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 72 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51417 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 85 mm bore?", "a": "The 514xx is the heavy section: 180×72 mm, 47.5 mm radial section at 85 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51117", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 85, "D_mm": 110, "B_mm": 19, "seal_type": "open", "dynamic_load_kN": 59.5, "static_load_kN": 190, "fatigue_load_limit_kN": 8.35, "limiting_speed_rpm": 1900, "speed_oil_rpm": 2700, "weight_g": 444, "manufacturer_designation": "51117", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51117 carries bore code 17 = 85 mm. The ISO 104 boundary dimensions are 85 mm bore, 110 mm outside diameter and 19 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 85 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 85 mm bore uses a smaller 110 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The shaft washer (bore 85 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51117 thrust ball bearing?", "a": "A 51117 thrust ball bearing has a 85 mm bore, 110 mm outside diameter and 19 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51117 bore code work?", "a": "The last two digits of 51117 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 19 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51117 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 85 mm bore?", "a": "The 511xx is the light section: 110×19 mm with a 12.5 mm radial section at 85 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51217", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 85, "D_mm": 125, "B_mm": 31, "seal_type": "open", "dynamic_load_kN": 117, "static_load_kN": 325, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 1400, "speed_oil_rpm": 2000, "weight_g": 1700, "manufacturer_designation": "51217", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51217 carries bore code 17 = 85 mm. The ISO 104 boundary dimensions are 85 mm bore, 125 mm outside diameter and 31 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 85 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 85 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 125 mm OD and 31 mm height.", "Minimum axial load is required to prevent ball skidding: at very light loads the balls slide rather than roll, causing smearing and early failure.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51217 thrust ball bearing?", "a": "A 51217 thrust ball bearing has a 85 mm bore, 125 mm outside diameter and 31 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51217 bore code work?", "a": "The last two digits of 51217 are bore code 17, giving 17 × 5 = 85 mm bore. The 125 mm outside diameter and 31 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51217 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 85 mm bore?", "a": "The 512xx is the medium-light section: 125×31 mm, 20.0 mm radial section at 85 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51317", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 85, "D_mm": 150, "B_mm": 49, "seal_type": "open", "dynamic_load_kN": 206, "static_load_kN": 490, "fatigue_load_limit_kN": 20.3, "limiting_speed_rpm": 1100, "speed_oil_rpm": 1600, "weight_g": 3520, "manufacturer_designation": "51317", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51317 carries bore code 17 = 85 mm. The ISO 104 boundary dimensions are 85 mm bore, 150 mm outside diameter and 49 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 85 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 85 mm bore through a larger 150 mm OD and 49 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51317 thrust ball bearing?", "a": "A 51317 thrust ball bearing has a 85 mm bore, 150 mm outside diameter and 49 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51317 bore code work?", "a": "The last two digits of 51317 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 49 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51317 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 85 mm bore?", "a": "The 513xx is the medium section: 150×49 mm, 32.5 mm radial section at 85 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51418", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 90, "D_mm": 190, "B_mm": 77, "seal_type": "open", "dynamic_load_kN": 305, "static_load_kN": 750, "fatigue_load_limit_kN": 28.6, "limiting_speed_rpm": 790, "speed_oil_rpm": 1100, "weight_g": 11000, "manufacturer_designation": "51418", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51418 carries bore code 18 = 90 mm. The ISO 104 boundary dimensions are 90 mm bore, 190 mm outside diameter and 77 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit" ], "pitfalls": [ "At a 90 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 514xx heavy section at 90 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "Thrust ball bearings carry axial load only — never apply radial load to 51418; the flat washers will skid and score.", "The 77 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51418." ], "faq": [ { "q": "What are the dimensions of a 51418 thrust ball bearing?", "a": "A 51418 thrust ball bearing has a 90 mm bore, 190 mm outside diameter and 77 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51418 bore code work?", "a": "The last two digits of 51418 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 77 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51418 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 90 mm bore?", "a": "The 514xx is the heavy section: 190×77 mm, 50.0 mm radial section at 90 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51118", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 90, "D_mm": 120, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 59.5, "static_load_kN": 190, "fatigue_load_limit_kN": 8.35, "limiting_speed_rpm": 1900, "speed_oil_rpm": 2700, "weight_g": 687, "manufacturer_designation": "51118", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51118 carries bore code 18 = 90 mm. The ISO 104 boundary dimensions are 90 mm bore, 120 mm outside diameter and 22 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "industrial motor and generator thrust", "heavy pump axial load support", "gearbox and reducer thrust management", "conveyor and elevator thrust washers" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 90 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 511xx light section at 90 mm bore uses a smaller 120 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "Thrust ball bearings carry axial load only — never apply radial load to 51118; the flat washers will skid and score.", "The shaft washer (bore 90 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51118 thrust ball bearing?", "a": "A 51118 thrust ball bearing has a 90 mm bore, 120 mm outside diameter and 22 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51118 bore code work?", "a": "The last two digits of 51118 are bore code 18, giving 18 × 5 = 90 mm bore. The 120 mm outside diameter and 22 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51118 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 90 mm bore?", "a": "The 511xx is the light section: 120×22 mm with a 15.0 mm radial section at 90 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51218", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 90, "D_mm": 135, "B_mm": 35, "seal_type": "open", "dynamic_load_kN": 125, "static_load_kN": 345, "fatigue_load_limit_kN": 14.7, "limiting_speed_rpm": 1300, "speed_oil_rpm": 1900, "weight_g": 2180, "manufacturer_designation": "51218", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51218 carries bore code 18 = 90 mm. The ISO 104 boundary dimensions are 90 mm bore, 135 mm outside diameter and 35 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "gearbox and reducer thrust management", "conveyor and elevator thrust washers", "machine tool spindle axial positioning", "paper mill roll axial restraint" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "At a 90 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 512xx medium-light section at 90 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 135 mm OD and 35 mm height.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "The 35 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51218." ], "faq": [ { "q": "What are the dimensions of a 51218 thrust ball bearing?", "a": "A 51218 thrust ball bearing has a 90 mm bore, 135 mm outside diameter and 35 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51218 bore code work?", "a": "The last two digits of 51218 are bore code 18, giving 18 × 5 = 90 mm bore. The 135 mm outside diameter and 35 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51218 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 90 mm bore?", "a": "The 512xx is the medium-light section: 135×35 mm, 22.5 mm radial section at 90 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51318", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 90, "D_mm": 155, "B_mm": 50, "seal_type": "open", "dynamic_load_kN": 213, "static_load_kN": 525, "fatigue_load_limit_kN": 21.3, "limiting_speed_rpm": 1100, "speed_oil_rpm": 1600, "weight_g": 3740, "manufacturer_designation": "51318", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51318 carries bore code 18 = 90 mm. The ISO 104 boundary dimensions are 90 mm bore, 155 mm outside diameter and 50 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "machine tool spindle axial positioning", "paper mill roll axial restraint", "industrial motor and generator thrust", "heavy pump axial load support" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up", "raceway indentation from static overload or improper mounting force" ], "pitfalls": [ "At a 90 mm bore, thermal expansion of the shaft can preload the thrust bearing; verify the housing washer has radial clearance to float and compensate.", "The 513xx medium section gains rating at 90 mm bore through a larger 155 mm OD and 50 mm height; the heavier assembly also trades away some speed versus a 512xx.", "The 50 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51318.", "The shaft washer (bore 90 mm) must be a tight fit on the shaft; the housing washer should be loose in the housing to allow self-alignment." ], "faq": [ { "q": "What are the dimensions of a 51318 thrust ball bearing?", "a": "A 51318 thrust ball bearing has a 90 mm bore, 155 mm outside diameter and 50 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51318 bore code work?", "a": "The last two digits of 51318 are bore code 18, giving 18 × 5 = 90 mm bore. The 155 mm outside diameter and 50 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51318 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 90 mm bore?", "a": "The 513xx is the medium section: 155×50 mm, 32.5 mm radial section at 90 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51420", "brand": "NTN", "series": "51400-series", "type": "thrust_ball", "d_mm": 100, "D_mm": 210, "B_mm": 85, "seal_type": "open", "dynamic_load_kN": 370, "static_load_kN": 865, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 800, "speed_oil_rpm": 1100, "weight_g": 13000, "manufacturer_designation": "51420", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51420 carries bore code 20 = 100 mm. The ISO 104 boundary dimensions are 100 mm bore, 210 mm outside diameter and 85 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "ship propeller shaft thrust support", "mining equipment axial positioning", "heavy industrial drive thrust support", "large gearbox axial load management" ], "failure_modes": [ "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary", "smearing or scoring from marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore thrust bearing by heating the shaft washer (induction heater, max 120 °C) — never drive it home through the housing washer or balls.", "The 514xx heavy section at 100 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.", "The 85 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51420.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51420 thrust ball bearing?", "a": "A 51420 thrust ball bearing has a 100 mm bore, 210 mm outside diameter and 85 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51420 bore code work?", "a": "The last two digits of 51420 are bore code 20, giving 20 × 5 = 100 mm bore. The 210 mm outside diameter and 85 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51420 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51400 compare with other thrust series at the same 100 mm bore?", "a": "The 514xx is the heavy section: 210×85 mm, 55.0 mm radial section at 100 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51120", "brand": "NTN", "series": "51100-series", "type": "thrust_ball", "d_mm": 100, "D_mm": 135, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 85, "static_load_kN": 230, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 1700, "speed_oil_rpm": 2400, "weight_g": 960, "manufacturer_designation": "51120", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51100-series (ISO 104 dimension series) the leading digits 511 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51120 carries bore code 20 = 100 mm. The ISO 104 boundary dimensions are 100 mm bore, 135 mm outside diameter and 25 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "ship propeller shaft thrust support", "mining equipment axial positioning", "heavy industrial drive thrust support", "large gearbox axial load management" ], "failure_modes": [ "raceway indentation from static overload or improper mounting force", "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore thrust bearing by heating the shaft washer (induction heater, max 120 °C) — never drive it home through the housing washer or balls.", "The 511xx light section at 100 mm bore uses a smaller 135 mm OD than a 512xx; load ratings are lower, so do not replace a failed 512-series bearing with a 511-series without re-rating the load.", "The 25 mm height includes both washers and the cage; verify the axial space in the housing before specifying 51120.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51120 thrust ball bearing?", "a": "A 51120 thrust ball bearing has a 100 mm bore, 135 mm outside diameter and 25 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51120 bore code work?", "a": "The last two digits of 51120 are bore code 20, giving 20 × 5 = 100 mm bore. The 135 mm outside diameter and 25 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51120 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51100 compare with other thrust series at the same 100 mm bore?", "a": "The 511xx is the light section: 135×25 mm with a 17.5 mm radial section at 100 mm bore — below 512/513/514 in load capacity, for light axial loads in compact spaces." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51220", "brand": "NTN", "series": "51200-series", "type": "thrust_ball", "d_mm": 100, "D_mm": 150, "B_mm": 38, "seal_type": "open", "dynamic_load_kN": 147, "static_load_kN": 410, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 1200, "speed_oil_rpm": 1700, "weight_g": 3100, "manufacturer_designation": "51220", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51200-series (ISO 104 dimension series) the leading digits 512 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51220 carries bore code 20 = 100 mm. The ISO 104 boundary dimensions are 100 mm bore, 150 mm outside diameter and 38 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "heavy industrial drive thrust support", "large gearbox axial load management", "crane and hoist drum thrust washers", "steel mill roll axial restraint" ], "failure_modes": [ "washer seat fretting from a loose housing or shaft fit", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading" ], "pitfalls": [ "Mount this 100 mm bore thrust bearing by heating the shaft washer (induction heater, max 120 °C) — never drive it home through the housing washer or balls.", "The 512xx medium-light section at 100 mm bore is the default general-purpose thrust bearing; before upgrading to a 513xx for extra capacity, confirm the housing accepts a 150 mm OD and 38 mm height.", "Thrust ball bearings carry axial load only — never apply radial load to 51220; the flat washers will skid and score.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component." ], "faq": [ { "q": "What are the dimensions of a 51220 thrust ball bearing?", "a": "A 51220 thrust ball bearing has a 100 mm bore, 150 mm outside diameter and 38 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51220 bore code work?", "a": "The last two digits of 51220 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 38 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51220 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51200 compare with other thrust series at the same 100 mm bore?", "a": "The 512xx is the medium-light section: 150×38 mm, 25.0 mm radial section at 100 mm bore. A 513xx on the same bore is larger and higher-rated; a 511xx is smaller and lower-rated." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "51320", "brand": "NTN", "series": "51300-series", "type": "thrust_ball", "d_mm": 100, "D_mm": 170, "B_mm": 55, "seal_type": "open", "dynamic_load_kN": 237, "static_load_kN": 595, "fatigue_load_limit_kN": 25, "limiting_speed_rpm": 990, "speed_oil_rpm": 1400, "weight_g": 4880, "manufacturer_designation": "51320", "standard": "ISO 104", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [], "naming_rule_text": "In the 51300-series (ISO 104 dimension series) the leading digits 513 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51320 carries bore code 20 = 100 mm. The ISO 104 boundary dimensions are 100 mm bore, 170 mm outside diameter and 55 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.", "applications": [ "crane and hoist drum thrust washers", "steel mill roll axial restraint", "ship propeller shaft thrust support", "mining equipment axial positioning" ], "failure_modes": [ "rolling-contact fatigue spalling after the rated L10 life is exceeded", "cage wear or fracture from sustained vibration or shock loading", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore thrust bearing by heating the shaft washer (induction heater, max 120 °C) — never drive it home through the housing washer or balls.", "The 513xx medium section gains rating at 100 mm bore through a larger 170 mm OD and 55 mm height; the heavier assembly also trades away some speed versus a 512xx.", "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.", "Single-direction thrust ball bearings carry load in one direction only; for bidirectional thrust use a double-direction bearing or two single-direction units back-to-back." ], "faq": [ { "q": "What are the dimensions of a 51320 thrust ball bearing?", "a": "A 51320 thrust ball bearing has a 100 mm bore, 170 mm outside diameter and 55 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly." }, { "q": "How does the 51320 bore code work?", "a": "The last two digits of 51320 are bore code 20, giving 20 × 5 = 100 mm bore. The 170 mm outside diameter and 55 mm height follow the ISO 104 dimension series, not the bore code alone." }, { "q": "Can a 51320 thrust ball bearing carry radial load?", "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)." }, { "q": "How does the 51300 compare with other thrust series at the same 100 mm bore?", "a": "The 513xx is the medium section: 170×55 mm, 35.0 mm radial section at 100 mm bore, carrying more load than a 512xx but needing a larger housing bore and giving up some speed." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0306FT2", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 3, "D_mm": 6.5, "B_mm": 6, "seal_type": "open", "dynamic_load_kN": 0.925, "static_load_kN": 0.565, "fatigue_load_limit_kN": 0.069, "limiting_speed_rpm": 33000, "speed_oil_rpm": 50000, "weight_g": 1, "manufacturer_designation": "HK0306FT2", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0306FT2" ], "naming_rule_text": "HK0306FT2 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 3 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 6.5 mm and the width is 6 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Automotive steering-column and pedal-box pivots use this size, where the cup is pressed into a sheet-metal bracket and the shaft sees only slow, heavily loaded oscillation. Never re-grease through a drilled hole in the housing wall without a vent path: pressure builds behind the cup, blows grease past the rollers, and starves the bearing while the housing looks full.", "applications": [ "small appliance gear drives", "instrument and meter linkages", "model and hobby drive trains", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "At a 3 mm shaft diameter the cup wall of HK0306FT2 is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.", "The cage in HK0306FT2 spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 3 mm.", "The 6 mm narrow section of HK0306FT2 is the compact option at 3 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 3×6.5 mm envelope.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell." ], "faq": [ { "q": "What are the dimensions of a HK0306FT2 needle roller bearing?", "a": "A HK0306FT2 drawn-cup needle roller bearing has a 3 mm shaft diameter (Fw, under-roller diameter), 6.5 mm outside diameter and 6 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0306FT2 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0306FT2, Fw = 3 mm, so the shaft must be machined to 3 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0306FT2 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0306FT2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK0306FT2 retained in the housing?", "a": "The thin-walled drawn cup of HK0306FT2 is press-fitted into a 6.5 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0408FT2", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 4, "D_mm": 8, "B_mm": 8, "seal_type": "open", "dynamic_load_kN": 1.77, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.155, "limiting_speed_rpm": 30000, "speed_oil_rpm": 45000, "weight_g": 2, "manufacturer_designation": "HK0408FT2", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0408FT2" ], "naming_rule_text": "NTN HK0408FT2 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 4 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 8 mm outside and 8 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.", "applications": [ "small appliance gear drives", "instrument and meter linkages", "model and hobby drive trains", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "At a 4 mm shaft diameter the cup wall of HK0408FT2 is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.", "The cage in HK0408FT2 spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 4 mm.", "The 8 mm narrow section of HK0408FT2 is the compact option at 4 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 4×8 mm envelope.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell." ], "faq": [ { "q": "What are the dimensions of a HK0408FT2 needle roller bearing?", "a": "A HK0408FT2 drawn-cup needle roller bearing has a 4 mm shaft diameter (Fw, under-roller diameter), 8 mm outside diameter and 8 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0408FT2 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0408FT2, Fw = 4 mm, so the shaft must be machined to 4 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0408FT2 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0408FT2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK0408FT2 retained in the housing?", "a": "The thin-walled drawn cup of HK0408FT2 is press-fitted into a 8 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0509FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 5, "D_mm": 9, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 2.45, "static_load_kN": 1.99, "fatigue_load_limit_kN": 0.243, "limiting_speed_rpm": 27000, "speed_oil_rpm": 40000, "weight_g": 2, "manufacturer_designation": "HK0509FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0509FM" ], "naming_rule_text": "HK0509FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 5 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 9 mm and the width is 9 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "office machine and printer mechanisms", "small appliance gear drives", "instrument and meter linkages", "heavily loaded slow pivots where static rating, not dynamic life, governs the choice" ], "failure_modes": [ "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path" ], "pitfalls": [ "At a 5 mm shaft diameter the cup wall of HK0509FM is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.", "The cage in HK0509FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 5 mm.", "The 9 mm narrow section of HK0509FM is the compact option at 5 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 5×9 mm envelope.", "HK0509FM runs directly on the shaft: the 5 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK0509FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty." ], "faq": [ { "q": "What are the dimensions of a HK0509FM needle roller bearing?", "a": "A HK0509FM drawn-cup needle roller bearing has a 5 mm shaft diameter (Fw, under-roller diameter), 9 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0509FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0509FM, Fw = 5 mm, so the shaft must be machined to 5 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0509FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0509FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK0509FM retained in the housing?", "a": "The thin-walled drawn cup of HK0509FM is press-fitted into a 9 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What duty conditions suit a HK0509FM drawn-cup bearing?", "a": "HK0509FM is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (27000/40000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0609FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 6, "D_mm": 10, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 2.92, "static_load_kN": 2.59, "fatigue_load_limit_kN": 0.315, "limiting_speed_rpm": 25000, "speed_oil_rpm": 37000, "weight_g": 2, "manufacturer_designation": "HK0609FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0609FM" ], "naming_rule_text": "HK0609FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 6 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 10 mm and the width is 9 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.", "applications": [ "micro gearbox and servo output shafts", "office machine and printer mechanisms", "small appliance gear drives", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "At a 6 mm shaft diameter the cup wall of HK0609FM is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.", "The cage in HK0609FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 6 mm.", "The 9 mm narrow section of HK0609FM is the compact option at 6 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 6×10 mm envelope.", "The HK0609FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life." ], "faq": [ { "q": "What are the dimensions of a HK0609FM needle roller bearing?", "a": "A HK0609FM drawn-cup needle roller bearing has a 6 mm shaft diameter (Fw, under-roller diameter), 10 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0609FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0609FM, Fw = 6 mm, so the shaft must be machined to 6 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0609FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0609FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK0609FM retained in the housing?", "a": "The thin-walled drawn cup of HK0609FM is press-fitted into a 10 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0709FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 7, "D_mm": 11, "B_mm": 9, "seal_type": "open", "dynamic_load_kN": 3.15, "static_load_kN": 2.93, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 23000, "speed_oil_rpm": 34000, "weight_g": 2, "manufacturer_designation": "HK0709FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0709FM" ], "naming_rule_text": "NTN HK0709FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 7 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 11 mm outside and 9 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.", "applications": [ "automotive accessory drives", "lawn and garden equipment spindles", "motorcycle and scooter transmissions", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "At a 7 mm shaft diameter, shaft surface finish is critical for HK0709FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.", "The cage in HK0709FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 7 mm.", "The 9 mm narrow section of HK0709FM is the compact option at 7 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 7×11 mm envelope.", "The open ends of HK0709FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty." ], "faq": [ { "q": "What are the dimensions of a HK0709FM needle roller bearing?", "a": "A HK0709FM drawn-cup needle roller bearing has a 7 mm shaft diameter (Fw, under-roller diameter), 11 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0709FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0709FM, Fw = 7 mm, so the shaft must be machined to 7 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0709FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0709FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK0709FM retained in the housing?", "a": "The thin-walled drawn cup of HK0709FM is press-fitted into a 11 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0810FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 8, "D_mm": 12, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 3.85, "static_load_kN": 3.95, "fatigue_load_limit_kN": 0.48, "limiting_speed_rpm": 20000, "speed_oil_rpm": 30000, "weight_g": 3, "manufacturer_designation": "HK0810FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0810FM", "HK0810FM+IR5x8x12" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK0810FM is built around a thin hardened steel cup.Its printed envelope — 8 mm under-roller diameter, 12 mm outside diameter, 10 mm width — is fixed by ISO 3245; the 8 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "lawn and garden equipment spindles", "motorcycle and scooter transmissions", "two-stroke engine crank and piston pins", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "Needle rollers tolerate almost no misalignment; if the 12 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "At a 8 mm shaft diameter, shaft surface finish is critical for HK0810FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.", "The cage in HK0810FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 8 mm.", "The 10 mm narrow section of HK0810FM is the compact option at 8 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 8×12 mm envelope." ], "faq": [ { "q": "Does HK0810FM need a hardened shaft?", "a": "Either the 8 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR5x8x12) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK0810FM drawn-cup bearing?", "a": "HK0810FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (20000/30000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK0810FM needle roller bearing?", "a": "A HK0810FM drawn-cup needle roller bearing has a 8 mm shaft diameter (Fw, under-roller diameter), 12 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0810FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0810FM, Fw = 8 mm, so the shaft must be machined to 8 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0810FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0810FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0910FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 9, "D_mm": 13, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 4.3, "static_load_kN": 4.65, "fatigue_load_limit_kN": 0.57, "limiting_speed_rpm": 18000, "speed_oil_rpm": 27000, "weight_g": 4, "manufacturer_designation": "HK0910FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0910FM", "HK0910FM+IR6x9x12" ], "naming_rule_text": "HK0910FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 9 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 13 mm and the width is 10 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.", "applications": [ "small hydraulic pump drives", "automotive accessory drives", "lawn and garden equipment spindles", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "At a 9 mm shaft diameter, shaft surface finish is critical for HK0910FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.", "The cage in HK0910FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 9 mm.", "The 10 mm narrow section of HK0910FM is the compact option at 9 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 9×13 mm envelope.", "Drawn-cup needle bearings carry radial load only: HK0910FM provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.", "The HK0910FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life." ], "faq": [ { "q": "What are the dimensions of a HK0910FM needle roller bearing?", "a": "A HK0910FM drawn-cup needle roller bearing has a 9 mm shaft diameter (Fw, under-roller diameter), 13 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0910FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0910FM, Fw = 9 mm, so the shaft must be machined to 9 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0910FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0910FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK0910FM need a hardened shaft?", "a": "Either the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR6x9x12) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK0910FM drawn-cup bearing?", "a": "HK0910FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (18000/27000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK0912F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 9, "D_mm": 13, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 5.4, "static_load_kN": 6.25, "fatigue_load_limit_kN": 0.765, "limiting_speed_rpm": 18000, "speed_oil_rpm": 27000, "weight_g": 4, "manufacturer_designation": "HK0912F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK0912F", "HK0912F+IR6x9x12" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK0912F is built around a thin hardened steel cup.Its printed envelope — 9 mm under-roller diameter, 13 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 9 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "power tool gear reduction stages", "small hydraulic pump drives", "automotive accessory drives", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "The open ends of HK0912F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "With no inner ring, HK0912F reads the 9 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK0912F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 9 mm.", "The 12 mm standard width of HK0912F is the general-purpose section at 9 mm shaft; wider HK variants in the same 9×13 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "HK0912F runs directly on the shaft: the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead." ], "faq": [ { "q": "What duty conditions suit a HK0912F drawn-cup bearing?", "a": "HK0912F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (18000/27000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK0912F needle roller bearing?", "a": "A HK0912F drawn-cup needle roller bearing has a 9 mm shaft diameter (Fw, under-roller diameter), 13 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK0912F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0912F, Fw = 9 mm, so the shaft must be machined to 9 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK0912F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK0912F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK0912F need a hardened shaft?", "a": "Either the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR6x9x12) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1010FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 10, "D_mm": 14, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 4.5, "static_load_kN": 5.1, "fatigue_load_limit_kN": 0.62, "limiting_speed_rpm": 16000, "speed_oil_rpm": 24000, "weight_g": 4, "manufacturer_designation": "HK1010FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1010FM", "HK1010FM+IR7x10x10.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK1010FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 10 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 14 mm cup outside diameter and 10 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.", "applications": [ "automotive accessory drives", "lawn and garden equipment spindles", "motorcycle and scooter transmissions", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The 10 mm narrow section of HK1010FM is the compact option at 10 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 10×14 mm envelope.", "The open ends of HK1010FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "With no inner ring, HK1010FM reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1010FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm." ], "faq": [ { "q": "Can a HK1010FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1010FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1010FM need a hardened shaft?", "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x10.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1010FM needle roller bearing?", "a": "A HK1010FM drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1010FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1010FM, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1012F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 10, "D_mm": 14, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 5.65, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.83, "limiting_speed_rpm": 16000, "speed_oil_rpm": 24000, "weight_g": 4, "manufacturer_designation": "HK1012F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1012F", "HK1012F+IR7x10x16" ], "naming_rule_text": "HK1012F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 10 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 14 mm and the width is 12 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Office automation equipment — printers, copiers, paper feeders — uses this size in the transport rollers, where the open ends are enclosed by the chassis and relubrication is never planned. For vertical shafts, arrange the housing so the open end of the cup faces up or provides a grease reservoir below — gravity drains lubricant away from the roller set otherwise.", "applications": [ "two-stroke engine crank and piston pins", "power tool gear reduction stages", "small hydraulic pump drives", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The HK1012F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "With no inner ring, HK1012F reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1012F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm.", "The 12 mm standard width of HK1012F is the general-purpose section at 10 mm shaft; wider HK variants in the same 10×14 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1012F need a hardened shaft?", "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x16) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1012F needle roller bearing?", "a": "A HK1012F drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1012F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1012F, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1012F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1012F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1015F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 10, "D_mm": 14, "B_mm": 15, "seal_type": "open", "dynamic_load_kN": 7.25, "static_load_kN": 9.4, "fatigue_load_limit_kN": 1.14, "limiting_speed_rpm": 16000, "speed_oil_rpm": 24000, "weight_g": 6, "manufacturer_designation": "HK1015F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1015F", "HK1015F+IR7x10x16" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1015F is built around a thin hardened steel cup.Its printed envelope — 10 mm under-roller diameter, 14 mm outside diameter, 15 mm width — is fixed by ISO 3245; the 10 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.", "applications": [ "automotive accessory drives", "lawn and garden equipment spindles", "motorcycle and scooter transmissions", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "The HK1015F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "With no inner ring, HK1015F reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1015F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm.", "The 15 mm standard width of HK1015F is the general-purpose section at 10 mm shaft; wider HK variants in the same 10×14 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Drawn-cup needle bearings carry radial load only: HK1015F provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces." ], "faq": [ { "q": "What duty conditions suit a HK1015F drawn-cup bearing?", "a": "HK1015F is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (16000/24000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK1015F needle roller bearing?", "a": "A HK1015F drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 15 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1015F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1015F, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1015F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1015F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1015F need a hardened shaft?", "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x16) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1210FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 12, "D_mm": 16, "B_mm": 10, "seal_type": "open", "dynamic_load_kN": 5.05, "static_load_kN": 6.25, "fatigue_load_limit_kN": 0.76, "limiting_speed_rpm": 13000, "speed_oil_rpm": 20000, "weight_g": 5, "manufacturer_designation": "HK1210FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1210FM", "HK1210FM+IR8x12x10.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1210FM is built around a thin hardened steel cup.Its printed envelope — 12 mm under-roller diameter, 16 mm outside diameter, 10 mm width — is fixed by ISO 3245; the 12 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.", "applications": [ "two-stroke engine crank and piston pins", "power tool gear reduction stages", "small hydraulic pump drives", "heavily loaded slow pivots where static rating, not dynamic life, governs the choice" ], "failure_modes": [ "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path" ], "pitfalls": [ "HK1210FM runs directly on the shaft: the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK1210FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "With no inner ring, HK1210FM reads the 12 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1210FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 12 mm.", "The 10 mm narrow section of HK1210FM is the compact option at 12 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 12×16 mm envelope." ], "faq": [ { "q": "Does HK1210FM need a hardened shaft?", "a": "Either the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR8x12x10.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK1210FM drawn-cup bearing?", "a": "HK1210FM is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (13000/20000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK1210FM needle roller bearing?", "a": "A HK1210FM drawn-cup needle roller bearing has a 12 mm shaft diameter (Fw, under-roller diameter), 16 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1210FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1210FM, Fw = 12 mm, so the shaft must be machined to 12 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1210FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1210FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1212FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 12, "D_mm": 18, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 6.6, "static_load_kN": 7.3, "fatigue_load_limit_kN": 0.89, "limiting_speed_rpm": 13000, "speed_oil_rpm": 20000, "weight_g": 9, "manufacturer_designation": "HK1212FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1212FM", "HK1212FM+IR8x12x12.5" ], "naming_rule_text": "NTN HK1212FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 12 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 18 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "small hydraulic pump drives", "automotive accessory drives", "lawn and garden equipment spindles", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "The cage in HK1212FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 12 mm.", "The 12 mm standard width of HK1212FM is the general-purpose section at 12 mm shaft; wider HK variants in the same 12×18 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "With no inner ring, HK1212FM reads the 12 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations." ], "faq": [ { "q": "What does Fw mean on a HK1212FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1212FM, Fw = 12 mm, so the shaft must be machined to 12 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1212FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1212FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1212FM need a hardened shaft?", "a": "Either the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR8x12x12.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1212FM needle roller bearing?", "a": "A HK1212FM drawn-cup needle roller bearing has a 12 mm shaft diameter (Fw, under-roller diameter), 18 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1312FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 13, "D_mm": 19, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 6.95, "static_load_kN": 7.9, "fatigue_load_limit_kN": 0.965, "limiting_speed_rpm": 12000, "speed_oil_rpm": 18000, "weight_g": 10, "manufacturer_designation": "HK1312FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1312FM", "HK1312FM+IR10x13x12.5" ], "naming_rule_text": "NTN HK1312FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 13 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 19 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.", "applications": [ "power tool gear reduction stages", "small hydraulic pump drives", "automotive accessory drives", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "HK1312FM runs directly on the shaft: the 13 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK1312FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "With no inner ring, HK1312FM reads the 13 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1312FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 13 mm.", "The 12 mm standard width of HK1312FM is the general-purpose section at 13 mm shaft; wider HK variants in the same 13×19 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1312FM need a hardened shaft?", "a": "Either the 13 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR10x13x12.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK1312FM drawn-cup bearing?", "a": "HK1312FM is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (12000/18000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK1312FM needle roller bearing?", "a": "A HK1312FM drawn-cup needle roller bearing has a 13 mm shaft diameter (Fw, under-roller diameter), 19 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1312FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1312FM, Fw = 13 mm, so the shaft must be machined to 13 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1312FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1312FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1412FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 14, "D_mm": 20, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 7.2, "static_load_kN": 8.5, "fatigue_load_limit_kN": 1.04, "limiting_speed_rpm": 11000, "speed_oil_rpm": 17000, "weight_g": 11, "manufacturer_designation": "HK1412FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1412FM", "HK1412FM+IR10x14x13" ], "naming_rule_text": "The NTN HK1412FM — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 14 mm is Fw, the under-roller (shaft journal) diameter; 20 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Compact hydraulic gear pumps use this size on their drive shafts: the pump housing is machined once, the cup is pressed home, and the shaft runs directly on the rollers for the life of the unit. For oscillating service, pack this size with a high-tackiness grease and re-lubricate at short intervals: the rollers do not complete a full revolution, so the same contact patch carries the load cycle after cycle.", "applications": [ "motorcycle and scooter transmissions", "two-stroke engine crank and piston pins", "power tool gear reduction stages", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "With no inner ring, HK1412FM reads the 14 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.", "The cage in HK1412FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 14 mm.", "The 12 mm standard width of HK1412FM is the general-purpose section at 14 mm shaft; wider HK variants in the same 14×20 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Needle rollers tolerate almost no misalignment; if the 20 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell." ], "faq": [ { "q": "What are the dimensions of a HK1412FM needle roller bearing?", "a": "A HK1412FM drawn-cup needle roller bearing has a 14 mm shaft diameter (Fw, under-roller diameter), 20 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1412FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1412FM, Fw = 14 mm, so the shaft must be machined to 14 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1412FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1412FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1412FM need a hardened shaft?", "a": "Either the 14 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR10x14x13) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK1412FM drawn-cup bearing?", "a": "HK1412FM is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (11000/17000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1416F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 14, "D_mm": 20, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 10.3, "static_load_kN": 13.4, "fatigue_load_limit_kN": 1.64, "limiting_speed_rpm": 11000, "speed_oil_rpm": 17000, "weight_g": 15, "manufacturer_designation": "HK1416F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1416F" ], "naming_rule_text": "NTN HK1416F belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 14 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 20 mm outside and 16 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Drawn cups in this class are the default compact radial bearing in motorcycle and power-tool gearboxes, where housing space is the binding constraint. Office automation equipment — printers, copiers, paper feeders — uses this size in the transport rollers, where the open ends are enclosed by the chassis and relubrication is never planned. For vertical shafts, arrange the housing so the open end of the cup faces up or provides a grease reservoir below — gravity drains lubricant away from the roller set otherwise.", "applications": [ "small hydraulic pump drives", "automotive accessory drives", "lawn and garden equipment spindles", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "The rollers of HK1416F run directly on the 14 mm journal: any score mark, rust pit or plating flake on that surface becomes a raceway defect — dress or replace a marginal shaft.", "The cage in HK1416F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 14 mm.", "The 16 mm standard width of HK1416F is the general-purpose section at 14 mm shaft; wider HK variants in the same 14×20 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "How is a HK1416F retained in the housing?", "a": "The thin-walled drawn cup of HK1416F is press-fitted into a 20 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What are the dimensions of a HK1416F needle roller bearing?", "a": "A HK1416F drawn-cup needle roller bearing has a 14 mm shaft diameter (Fw, under-roller diameter), 20 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1416F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1416F, Fw = 14 mm, so the shaft must be machined to 14 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1416F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1416F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1512FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 15, "D_mm": 21, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 7.5, "static_load_kN": 9.1, "fatigue_load_limit_kN": 1.11, "limiting_speed_rpm": 11000, "speed_oil_rpm": 16000, "weight_g": 11, "manufacturer_designation": "HK1512FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1512FM", "HK1512FM+IR12x15x12.5" ], "naming_rule_text": "The NTN HK1512FM — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 15 mm is Fw, the under-roller (shaft journal) diameter; 21 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The open ends of HK1512FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "Mid-size cups like HK1512FM (15 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK1512FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 15 mm.", "The 12 mm standard width of HK1512FM is the general-purpose section at 15 mm shaft; wider HK variants in the same 15×21 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1512FM need a hardened shaft?", "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x12.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1512FM needle roller bearing?", "a": "A HK1512FM drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1512FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1512FM, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1512FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1512FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1516F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 15, "D_mm": 21, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 10.7, "static_load_kN": 14.4, "fatigue_load_limit_kN": 1.75, "limiting_speed_rpm": 11000, "speed_oil_rpm": 16000, "weight_g": 15, "manufacturer_designation": "HK1516F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1516F", "HK1516F+IR12x15x16.5" ], "naming_rule_text": "The NTN HK1516F — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 15 mm is Fw, the under-roller (shaft journal) diameter; 21 mm and 16 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.", "applications": [ "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "compressor crankshaft supports", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The HK1516F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Before pressing HK1516F in, verify the 15 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.", "The cage in HK1516F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 15 mm.", "The 16 mm standard width of HK1516F is the general-purpose section at 15 mm shaft; wider HK variants in the same 15×21 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1516F need a hardened shaft?", "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x16.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1516F needle roller bearing?", "a": "A HK1516F drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1516F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1516F, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1516F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1516F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1522ZWFD", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 15, "D_mm": 21, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 12.9, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.22, "limiting_speed_rpm": 11000, "speed_oil_rpm": 16000, "weight_g": 20, "manufacturer_designation": "HK1522ZWFD", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1522ZWFD", "HK1522ZWFD+IR12x15x22.5" ], "naming_rule_text": "NTN HK1522ZWFD belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 15 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 21 mm outside and 22 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. Automotive steering-column and pedal-box pivots use this size, where the cup is pressed into a sheet-metal bracket and the shaft sees only slow, heavily loaded oscillation. Never re-grease through a drilled hole in the housing wall without a vent path: pressure builds behind the cup, blows grease past the rollers, and starves the bearing while the housing looks full.", "applications": [ "automotive manual transmission gear sets", "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "The 22 mm wide section of HK1522ZWFD gains rating through longer rollers at 15 mm shaft; confirm the housing width accepts 22 mm — it will not drop into a seat machined for the 15×21 mm narrow variant.", "The open ends of HK1522ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "At a 15 mm shaft diameter, check housing bore roundness after previous bearing removal for HK1522ZWFD; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.", "The two roller rows in HK1522ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 21 mm seat straight over the full 22 mm width and keep shaft deflection minimal." ], "faq": [ { "q": "Can a HK1522ZWFD needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1522ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1522ZWFD need a hardened shaft?", "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x22.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1522ZWFD needle roller bearing?", "a": "A HK1522ZWFD drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 22 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1522ZWFD drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1522ZWFD, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1612FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 16, "D_mm": 22, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 7.75, "static_load_kN": 9.7, "fatigue_load_limit_kN": 1.18, "limiting_speed_rpm": 10000, "speed_oil_rpm": 15000, "weight_g": 12, "manufacturer_designation": "HK1612FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1612FM", "HK1612FM+IR12x16x13" ], "naming_rule_text": "In the HK-series (ISO 3245), HK1612FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 16 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 22 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.", "applications": [ "compressor crankshaft supports", "agricultural machinery PTO drives", "universal joint and steering pivots", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Mid-size cups like HK1612FM (16 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK1612FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 16 mm.", "The 12 mm standard width of HK1612FM is the general-purpose section at 16 mm shaft; wider HK variants in the same 16×22 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1612FM need a hardened shaft?", "a": "Either the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x16x13) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1612FM needle roller bearing?", "a": "A HK1612FM drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1612FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1612FM, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1612FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1612FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1616F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 16, "D_mm": 22, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 11.1, "static_load_kN": 15.3, "fatigue_load_limit_kN": 1.87, "limiting_speed_rpm": 10000, "speed_oil_rpm": 15000, "weight_g": 16, "manufacturer_designation": "HK1616F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1616F", "HK1616F+IR12x16x20" ], "naming_rule_text": "In the HK-series (ISO 3245), HK1616F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 16 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 22 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The open ends of HK1616F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "At a 16 mm shaft diameter, check housing bore roundness after previous bearing removal for HK1616F; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.", "The cage in HK1616F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 16 mm.", "The 16 mm standard width of HK1616F is the general-purpose section at 16 mm shaft; wider HK variants in the same 16×22 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1616F need a hardened shaft?", "a": "Either the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x16x20) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1616F needle roller bearing?", "a": "A HK1616F drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1616F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1616F, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1616F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1616F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1622ZWFD", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 16, "D_mm": 22, "B_mm": 22, "seal_type": "open", "dynamic_load_kN": 13.3, "static_load_kN": 19.4, "fatigue_load_limit_kN": 2.37, "limiting_speed_rpm": 10000, "speed_oil_rpm": 15000, "weight_g": 22, "manufacturer_designation": "HK1622ZWFD", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1622ZWFD" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1622ZWFD is built around a thin hardened steel cup.Its printed envelope — 16 mm under-roller diameter, 22 mm outside diameter, 22 mm width — is fixed by ISO 3245; the 16 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.", "applications": [ "compressor crankshaft supports", "agricultural machinery PTO drives", "universal joint and steering pivots", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "Mid-size cups like HK1622ZWFD (16 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The two roller rows in HK1622ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 22 mm seat straight over the full 22 mm width and keep shaft deflection minimal.", "The 22 mm wide section of HK1622ZWFD gains rating through longer rollers at 16 mm shaft; confirm the housing width accepts 22 mm — it will not drop into a seat machined for the 16×22 mm narrow variant.", "HK1622ZWFD runs directly on the shaft: the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK1622ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty." ], "faq": [ { "q": "What are the dimensions of a HK1622ZWFD needle roller bearing?", "a": "A HK1622ZWFD drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 22 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1622ZWFD drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1622ZWFD, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1622ZWFD needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1622ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK1622ZWFD retained in the housing?", "a": "The thin-walled drawn cup of HK1622ZWFD is press-fitted into a 22 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What duty conditions suit a HK1622ZWFD drawn-cup bearing?", "a": "HK1622ZWFD is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (10000/15000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1712FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 17, "D_mm": 23, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 8.05, "static_load_kN": 10.3, "fatigue_load_limit_kN": 1.26, "limiting_speed_rpm": 9500, "speed_oil_rpm": 14000, "weight_g": 12, "manufacturer_designation": "HK1712FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1712FM" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1712FM is built around a thin hardened steel cup.Its printed envelope — 17 mm under-roller diameter, 23 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 17 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.", "applications": [ "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "compressor crankshaft supports", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The HK1712FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK1712FM (17 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK1712FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 17 mm.", "The 12 mm standard width of HK1712FM is the general-purpose section at 17 mm shaft; wider HK variants in the same 17×23 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "How is a HK1712FM retained in the housing?", "a": "The thin-walled drawn cup of HK1712FM is press-fitted into a 23 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What are the dimensions of a HK1712FM needle roller bearing?", "a": "A HK1712FM drawn-cup needle roller bearing has a 17 mm shaft diameter (Fw, under-roller diameter), 23 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1712FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1712FM, Fw = 17 mm, so the shaft must be machined to 17 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1712FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1712FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1812FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 18, "D_mm": 24, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 8.3, "static_load_kN": 10.9, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 8500, "speed_oil_rpm": 13000, "weight_g": 13, "manufacturer_designation": "HK1812FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1812FM", "HK1812FM+IR15x18x12.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1812FM is built around a thin hardened steel cup.Its printed envelope — 18 mm under-roller diameter, 24 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 18 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.", "applications": [ "automotive manual transmission gear sets", "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Mid-size cups like HK1812FM (18 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK1812FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 18 mm.", "The 12 mm standard width of HK1812FM is the general-purpose section at 18 mm shaft; wider HK variants in the same 18×24 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Needle rollers tolerate almost no misalignment; if the 24 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling." ], "faq": [ { "q": "What duty conditions suit a HK1812FM drawn-cup bearing?", "a": "HK1812FM is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (8500/13000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK1812FM needle roller bearing?", "a": "A HK1812FM drawn-cup needle roller bearing has a 18 mm shaft diameter (Fw, under-roller diameter), 24 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1812FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1812FM, Fw = 18 mm, so the shaft must be machined to 18 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1812FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1812FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK1812FM need a hardened shaft?", "a": "Either the 18 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x18x12.5) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK1816F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 18, "D_mm": 24, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 11.8, "static_load_kN": 17.3, "fatigue_load_limit_kN": 2.11, "limiting_speed_rpm": 8500, "speed_oil_rpm": 13000, "weight_g": 18, "manufacturer_designation": "HK1816F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK1816F", "HK1816F+IR15x18x16.5" ], "naming_rule_text": "HK1816F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 18 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 24 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.", "applications": [ "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "compressor crankshaft supports", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The HK1816F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK1816F (18 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK1816F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 18 mm.", "The 16 mm standard width of HK1816F is the general-purpose section at 18 mm shaft; wider HK variants in the same 18×24 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK1816F need a hardened shaft?", "a": "Either the 18 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x18x16.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK1816F needle roller bearing?", "a": "A HK1816F drawn-cup needle roller bearing has a 18 mm shaft diameter (Fw, under-roller diameter), 24 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK1816F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1816F, Fw = 18 mm, so the shaft must be machined to 18 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK1816F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK1816F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2012FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 20, "D_mm": 26, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 8.75, "static_load_kN": 12.1, "fatigue_load_limit_kN": 1.48, "limiting_speed_rpm": 8000, "speed_oil_rpm": 12000, "weight_g": 14, "manufacturer_designation": "HK2012FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2012FM", "HK2012FM+IR15x20x13" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2012FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "The cage in HK2012FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.", "The 12 mm standard width of HK2012FM is the general-purpose section at 20 mm shaft; wider HK variants in the same 20×26 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "The open ends of HK2012FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "At a 20 mm shaft diameter, check housing bore roundness after previous bearing removal for HK2012FM; a pulled or scored seat must be re-machined or sleeved before the new cup goes in." ], "faq": [ { "q": "What does Fw mean on a HK2012FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2012FM, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2012FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2012FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2012FM need a hardened shaft?", "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x20x13) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2012FM needle roller bearing?", "a": "A HK2012FM drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2016F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 20, "D_mm": 26, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 12.5, "static_load_kN": 19.2, "fatigue_load_limit_kN": 2.34, "limiting_speed_rpm": 8000, "speed_oil_rpm": 12000, "weight_g": 19, "manufacturer_designation": "HK2016F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2016F", "HK2016F+IR17x20x16.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2016F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "compressor crankshaft supports", "agricultural machinery PTO drives", "universal joint and steering pivots", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Before pressing HK2016F in, verify the 20 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.", "The cage in HK2016F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.", "The 16 mm standard width of HK2016F is the general-purpose section at 20 mm shaft; wider HK variants in the same 20×26 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK2016F need a hardened shaft?", "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x16.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2016F needle roller bearing?", "a": "A HK2016F drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2016F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2016F, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2016F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2016F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2020F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 20, "D_mm": 26, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 16, "static_load_kN": 26.2, "fatigue_load_limit_kN": 3.2, "limiting_speed_rpm": 8000, "speed_oil_rpm": 12000, "weight_g": 24, "manufacturer_designation": "HK2020F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2020F", "HK2020F+IR17x20x20.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2020F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 20 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Marine outboard and small diesel linkage points use this size: the pressed-in cup tolerates the corrosion-prone environment better than a machined ring with a separate inner race. In high-speed applications, switch from grease to a circulating oil supply: the open ends let oil through, but grease at high speed channels and overheats the roller set.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "Drawn-cup needle bearings carry radial load only: HK2020F provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.", "The HK2020F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK2020F (20 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK2020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.", "The 20 mm wide section of HK2020F gains rating through longer rollers at 20 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 20×26 mm narrow variant." ], "faq": [ { "q": "Does HK2020F need a hardened shaft?", "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x20.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK2020F drawn-cup bearing?", "a": "HK2020F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (8000/12000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2020F needle roller bearing?", "a": "A HK2020F drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2020F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2020F, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2020F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2030ZWFD", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 20, "D_mm": 26, "B_mm": 30, "seal_type": "open", "dynamic_load_kN": 21.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 4.7, "limiting_speed_rpm": 8000, "speed_oil_rpm": 12000, "weight_g": 35, "manufacturer_designation": "HK2030ZWFD", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2030ZWFD", "HK2030ZWFD+IR17x20x30.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2030ZWFD is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 30 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Marine outboard and small diesel linkage points use this size: the pressed-in cup tolerates the corrosion-prone environment better than a machined ring with a separate inner race. In high-speed applications, switch from grease to a circulating oil supply: the open ends let oil through, but grease at high speed channels and overheats the roller set.", "applications": [ "agricultural machinery PTO drives", "universal joint and steering pivots", "automotive manual transmission gear sets", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "The open ends of HK2030ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "Before pressing HK2030ZWFD in, verify the 20 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.", "The two roller rows in HK2030ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 26 mm seat straight over the full 30 mm width and keep shaft deflection minimal.", "The 30 mm extra-wide section of HK2030ZWFD (double-row or extended roller set) is the high-capacity option at 20 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 30 mm width.", "HK2030ZWFD runs directly on the shaft: the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead." ], "faq": [ { "q": "What duty conditions suit a HK2030ZWFD drawn-cup bearing?", "a": "HK2030ZWFD is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (8000/12000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2030ZWFD needle roller bearing?", "a": "A HK2030ZWFD drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 30 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2030ZWFD drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2030ZWFD, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2030ZWFD needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2030ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2030ZWFD need a hardened shaft?", "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x30.5) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2212FM", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 22, "D_mm": 28, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 9.2, "static_load_kN": 13.4, "fatigue_load_limit_kN": 1.63, "limiting_speed_rpm": 7500, "speed_oil_rpm": 11000, "weight_g": 13, "manufacturer_designation": "HK2212FM", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2212FM", "HK2212FM+IR17x22x13" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK2212FM is built around a thin hardened steel cup.Its printed envelope — 22 mm under-roller diameter, 28 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 22 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. Compact hydraulic gear pumps use this size on their drive shafts: the pump housing is machined once, the cup is pressed home, and the shaft runs directly on the rollers for the life of the unit. For oscillating service, pack this size with a high-tackiness grease and re-lubricate at short intervals: the rollers do not complete a full revolution, so the same contact patch carries the load cycle after cycle.", "applications": [ "hydraulic pump and motor shafts", "compressor crankshaft supports", "agricultural machinery PTO drives", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "The open ends of HK2212FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "At a 22 mm shaft diameter, check housing bore roundness after previous bearing removal for HK2212FM; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.", "The cage in HK2212FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm.", "The 12 mm standard width of HK2212FM is the general-purpose section at 22 mm shaft; wider HK variants in the same 22×28 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "HK2212FM runs directly on the shaft: the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead." ], "faq": [ { "q": "What duty conditions suit a HK2212FM drawn-cup bearing?", "a": "HK2212FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (7500/11000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2212FM needle roller bearing?", "a": "A HK2212FM drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2212FM drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2212FM, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2212FM needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2212FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2212FM need a hardened shaft?", "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x13) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2216F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 22, "D_mm": 28, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 13.2, "static_load_kN": 21.1, "fatigue_load_limit_kN": 2.57, "limiting_speed_rpm": 7500, "speed_oil_rpm": 11000, "weight_g": 21, "manufacturer_designation": "HK2216F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2216F", "HK2216F+IR17x22x18" ], "naming_rule_text": "HK2216F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 22 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 28 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The open ends of HK2216F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "Mid-size cups like HK2216F (22 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK2216F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm.", "The 16 mm standard width of HK2216F is the general-purpose section at 22 mm shaft; wider HK variants in the same 22×28 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK2216F need a hardened shaft?", "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x18) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2216F needle roller bearing?", "a": "A HK2216F drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2216F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2216F, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2216F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2216F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2220F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 22, "D_mm": 28, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 16.8, "static_load_kN": 28.8, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 7500, "speed_oil_rpm": 11000, "weight_g": 26, "manufacturer_designation": "HK2220F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2220F", "HK2220F+IR17x22x20.5" ], "naming_rule_text": "HK2220F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 22 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 28 mm and the width is 20 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.", "applications": [ "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "compressor crankshaft supports", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "The 20 mm wide section of HK2220F gains rating through longer rollers at 22 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 22×28 mm narrow variant.", "Needle rollers tolerate almost no misalignment; if the 28 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Before pressing HK2220F in, verify the 22 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.", "The cage in HK2220F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm." ], "faq": [ { "q": "Can a HK2220F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2220F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2220F need a hardened shaft?", "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x20.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK2220F drawn-cup bearing?", "a": "HK2220F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (7500/11000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2220F needle roller bearing?", "a": "A HK2220F drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2220F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2220F, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2512F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 25, "D_mm": 32, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 11.1, "static_load_kN": 15.2, "fatigue_load_limit_kN": 1.85, "limiting_speed_rpm": 6500, "speed_oil_rpm": 9500, "weight_g": 21, "manufacturer_designation": "HK2512F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2512F", "HK2512F+IR20x25x12.5" ], "naming_rule_text": "NTN HK2512F belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 25 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 32 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.", "applications": [ "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "compressor crankshaft supports", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The HK2512F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK2512F (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "The cage in HK2512F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 25 mm.", "The 12 mm standard width of HK2512F is the general-purpose section at 25 mm shaft; wider HK variants in the same 25×32 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK2512F need a hardened shaft?", "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x12.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2512F needle roller bearing?", "a": "A HK2512F drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2512F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2512F, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2512F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2512F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2516F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 25, "D_mm": 32, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 15.9, "static_load_kN": 24, "fatigue_load_limit_kN": 2.92, "limiting_speed_rpm": 6500, "speed_oil_rpm": 9500, "weight_g": 27, "manufacturer_designation": "HK2516F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2516F", "HK2516F+IR20x25x17" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2516F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 25 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 32 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "intermittent duty with long standstill periods that invite false brinelling" ], "failure_modes": [ "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness" ], "pitfalls": [ "The open ends of HK2516F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "Before pressing HK2516F in, verify the 25 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.", "The cage in HK2516F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 25 mm.", "The 16 mm standard width of HK2516F is the general-purpose section at 25 mm shaft; wider HK variants in the same 25×32 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK2516F need a hardened shaft?", "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x17) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2516F needle roller bearing?", "a": "A HK2516F drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2516F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2516F, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2516F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2516F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2520", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 25, "D_mm": 32, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 20.3, "static_load_kN": 33, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 6500, "speed_oil_rpm": 9500, "weight_g": 34, "manufacturer_designation": "HK2520", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2520", "HK2520+IR20x25x20.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK2520 is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 25 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 32 mm cup outside diameter and 20 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "Drawn-cup needle bearings carry radial load only: HK2520 provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.", "The HK2520 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK2520 (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "With no suffix letters, HK2520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 25×32×20 mm match exactly — suffix conventions for cage and shell variants differ between makers.", "The 20 mm wide section of HK2520 gains rating through longer rollers at 25 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 25×32 mm narrow variant." ], "faq": [ { "q": "Does HK2520 need a hardened shaft?", "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x20.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK2520 drawn-cup bearing?", "a": "HK2520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (6500/9500 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2520 needle roller bearing?", "a": "A HK2520 drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2520 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2520, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2520 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2526C", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 25, "D_mm": 32, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 26.4, "static_load_kN": 46, "fatigue_load_limit_kN": 5.6, "limiting_speed_rpm": 6500, "speed_oil_rpm": 9500, "weight_g": 45, "manufacturer_designation": "HK2526C", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2526C", "HK2526C+IR20x25x26.5" ], "naming_rule_text": "The NTN HK2526C — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 25 mm is Fw, the under-roller (shaft journal) diameter; 32 mm and 26 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.", "applications": [ "universal joint and steering pivots", "automotive manual transmission gear sets", "industrial gearbox lay shafts", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Mid-size cups like HK2526C (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.", "HK2526C carries a maker-specific variant code after the size: when substituting another brand, match the printed 25×32×26 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 26 mm extra-wide section of HK2526C (double-row or extended roller set) is the high-capacity option at 25 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width." ], "faq": [ { "q": "Does HK2526C need a hardened shaft?", "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x26.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2526C needle roller bearing?", "a": "A HK2526C drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 26 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2526C drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2526C, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2526C needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2526C carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2538ZWD", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 25, "D_mm": 32, "B_mm": 38, "seal_type": "open", "dynamic_load_kN": 35, "static_load_kN": 65.5, "fatigue_load_limit_kN": 8, "limiting_speed_rpm": 6500, "speed_oil_rpm": 9500, "weight_g": 65, "manufacturer_designation": "HK2538ZWD", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2538ZWD", "HK2538ZWD+IR20x25x38.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK2538ZWD is built around a thin hardened steel cup.Its printed envelope — 25 mm under-roller diameter, 32 mm outside diameter, 38 mm width — is fixed by ISO 3245; the 25 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.", "applications": [ "automotive manual transmission gear sets", "industrial gearbox lay shafts", "hydraulic pump and motor shafts", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "The two roller rows in HK2538ZWD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 32 mm seat straight over the full 38 mm width and keep shaft deflection minimal.", "The 38 mm extra-wide section of HK2538ZWD (double-row or extended roller set) is the high-capacity option at 25 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 38 mm width.", "Drawn-cup needle bearings carry radial load only: HK2538ZWD provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.", "The HK2538ZWD drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Mid-size cups like HK2538ZWD (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short." ], "faq": [ { "q": "What does Fw mean on a HK2538ZWD drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2538ZWD, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2538ZWD needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2538ZWD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2538ZWD need a hardened shaft?", "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x38.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK2538ZWD drawn-cup bearing?", "a": "HK2538ZWD is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (6500/9500 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK2538ZWD needle roller bearing?", "a": "A HK2538ZWD drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 38 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2816CT", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 28, "D_mm": 35, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 16.7, "static_load_kN": 26.4, "fatigue_load_limit_kN": 3.2, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8500, "weight_g": 30, "manufacturer_designation": "HK2816CT", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2816CT", "HK2816CT+IR22x28x17" ], "naming_rule_text": "The NTN HK2816CT — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 28 mm is Fw, the under-roller (shaft journal) diameter; 35 mm and 16 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.", "applications": [ "heavy gearbox and final drive shafts", "construction equipment swing pivots", "printing press cylinder journals", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "The press-fit of HK2816CT at 28 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "HK2816CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 28×35×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 16 mm standard width of HK2816CT is the general-purpose section at 28 mm shaft; wider HK variants in the same 28×35 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Needle rollers tolerate almost no misalignment; if the 35 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell." ], "faq": [ { "q": "What are the dimensions of a HK2816CT needle roller bearing?", "a": "A HK2816CT drawn-cup needle roller bearing has a 28 mm shaft diameter (Fw, under-roller diameter), 35 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2816CT drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2816CT, Fw = 28 mm, so the shaft must be machined to 28 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK2816CT needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2816CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2816CT need a hardened shaft?", "a": "Either the 28 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR22x28x17) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK2816CT drawn-cup bearing?", "a": "HK2816CT is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (5500/8500 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK2820", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 28, "D_mm": 35, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 21.3, "static_load_kN": 36, "fatigue_load_limit_kN": 4.4, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8500, "weight_g": 38, "manufacturer_designation": "HK2820", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK2820", "HK2820+IR22x28x20.5" ], "naming_rule_text": "The NTN HK2820 — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 28 mm is Fw, the under-roller (shaft journal) diameter; 35 mm and 20 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.", "applications": [ "printing press cylinder journals", "machine tool feed drive supports", "marine steering and linkage shafts", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "The 20 mm wide section of HK2820 gains rating through longer rollers at 28 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 28×35 mm narrow variant.", "The HK2820 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Pressing HK2820 (28 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.", "With no suffix letters, HK2820 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 28×35×20 mm match exactly — suffix conventions for cage and shell variants differ between makers." ], "faq": [ { "q": "Can a HK2820 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK2820 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK2820 need a hardened shaft?", "a": "Either the 28 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR22x28x20.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK2820 needle roller bearing?", "a": "A HK2820 drawn-cup needle roller bearing has a 28 mm shaft diameter (Fw, under-roller diameter), 35 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK2820 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2820, Fw = 28 mm, so the shaft must be machined to 28 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3012CT", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 30, "D_mm": 37, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 12.3, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.22, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8000, "weight_g": 24, "manufacturer_designation": "HK3012CT", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3012CT", "HK3012CT+IR25x30x12.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3012CT is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Model and hobby drivetrains, from RC cars to small robotics, use this size because the thin cup lets designers shrink the gearbox around the gears rather than around the bearing. For low-temperature service, verify the grease is rated for the minimum ambient — a standard lithium grease in this cup will stiffen and starve the rollers on a cold start.", "applications": [ "construction equipment swing pivots", "printing press cylinder journals", "machine tool feed drive supports", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The HK3012CT drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.", "Pressing HK3012CT (30 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.", "HK3012CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 30×37×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 12 mm standard width of HK3012CT is the general-purpose section at 30 mm shaft; wider HK variants in the same 30×37 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK3012CT need a hardened shaft?", "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x12.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK3012CT needle roller bearing?", "a": "A HK3012CT drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3012CT drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3012CT, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3012CT needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3012CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "7E-HK3016C", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 30, "D_mm": 37, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 18.1, "static_load_kN": 30, "fatigue_load_limit_kN": 3.65, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8000, "weight_g": 32, "manufacturer_designation": "7E-HK3016C", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "7E-HK3016C", "7E-HK3016C+IR25x30x17" ], "naming_rule_text": "In the HK-series (ISO 3245), 7E-HK3016C is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 30 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 37 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.", "applications": [ "printing press cylinder journals", "machine tool feed drive supports", "marine steering and linkage shafts", "heavily loaded slow pivots where static rating, not dynamic life, governs the choice" ], "failure_modes": [ "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting", "grease starvation in the open-end arrangement with no relubrication path" ], "pitfalls": [ "The 16 mm standard width of 7E-HK3016C is the general-purpose section at 30 mm shaft; wider HK variants in the same 30×37 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "7E-HK3016C runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of 7E-HK3016C retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "The press-fit of 7E-HK3016C at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "7E-HK3016C carries a maker-specific variant code after the size: when substituting another brand, match the printed 30×37×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers." ], "faq": [ { "q": "Can a 7E-HK3016C needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like 7E-HK3016C carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does 7E-HK3016C need a hardened shaft?", "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x17) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a 7E-HK3016C drawn-cup bearing?", "a": "7E-HK3016C is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a 7E-HK3016C needle roller bearing?", "a": "A 7E-HK3016C drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a 7E-HK3016C drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For 7E-HK3016C, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3020F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 30, "D_mm": 37, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 22.3, "static_load_kN": 39.5, "fatigue_load_limit_kN": 4.8, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8000, "weight_g": 40, "manufacturer_designation": "HK3020F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3020F", "HK3020F+IR25x30x20.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3020F is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.", "applications": [ "machine tool feed drive supports", "marine steering and linkage shafts", "rolling mill auxiliary drives", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "The press-fit of HK3020F at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "The cage in HK3020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 30 mm.", "The 20 mm wide section of HK3020F gains rating through longer rollers at 30 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 30×37 mm narrow variant.", "HK3020F runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK3020F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty." ], "faq": [ { "q": "What are the dimensions of a HK3020F needle roller bearing?", "a": "A HK3020F drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3020F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3020F, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3020F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK3020F need a hardened shaft?", "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x20.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK3020F drawn-cup bearing?", "a": "HK3020F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3026F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 30, "D_mm": 37, "B_mm": 26, "seal_type": "open", "dynamic_load_kN": 28.5, "static_load_kN": 54, "fatigue_load_limit_kN": 6.55, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8000, "weight_g": 53, "manufacturer_designation": "HK3026F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3026F", "HK3026F+IR25x30x26.5" ], "naming_rule_text": "The NTN HK3026F — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 30 mm is Fw, the under-roller (shaft journal) diameter; 37 mm and 26 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.", "applications": [ "marine steering and linkage shafts", "rolling mill auxiliary drives", "heavy gearbox and final drive shafts", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "The 26 mm extra-wide section of HK3026F (double-row or extended roller set) is the high-capacity option at 30 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width.", "HK3026F runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK3026F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "The press-fit of HK3026F at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "The cage in HK3026F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 30 mm." ], "faq": [ { "q": "Can a HK3026F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3026F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK3026F need a hardened shaft?", "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x26.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK3026F drawn-cup bearing?", "a": "HK3026F is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK3026F needle roller bearing?", "a": "A HK3026F drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 26 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3026F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3026F, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3038ZWD", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 30, "D_mm": 37, "B_mm": 38, "seal_type": "open", "dynamic_load_kN": 38.5, "static_load_kN": 78.5, "fatigue_load_limit_kN": 9.6, "limiting_speed_rpm": 5500, "speed_oil_rpm": 8000, "weight_g": 76, "manufacturer_designation": "HK3038ZWD", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3038ZWD", "HK3038ZWD+IR25x30x38.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3038ZWD is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 38 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. At this shaft size the cup carries substantial radial load, but correct press-fit practice and housing rigidity become decisive for reaching the calculated life. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.", "applications": [ "rolling mill auxiliary drives", "heavy gearbox and final drive shafts", "construction equipment swing pivots", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "At a 30 mm shaft diameter the press-in force for HK3038ZWD is substantial; use a press with a guided mandrel and confirm the cup seats against the housing shoulder — a cocked cup concentrates load on the outermost roller row.", "The two roller rows in HK3038ZWD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 37 mm seat straight over the full 38 mm width and keep shaft deflection minimal.", "The 38 mm extra-wide section of HK3038ZWD (double-row or extended roller set) is the high-capacity option at 30 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 38 mm width." ], "faq": [ { "q": "Does HK3038ZWD need a hardened shaft?", "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x38.5) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK3038ZWD needle roller bearing?", "a": "A HK3038ZWD drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 38 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3038ZWD drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3038ZWD, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3038ZWD needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3038ZWD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3512CV2", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 35, "D_mm": 42, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 13.3, "static_load_kN": 21.3, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 4700, "speed_oil_rpm": 7000, "weight_g": 28, "manufacturer_designation": "HK3512CV2", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3512CV2" ], "naming_rule_text": "The NTN HK3512CV2 — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 35 mm is Fw, the under-roller (shaft journal) diameter; 42 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.", "applications": [ "heavy gearbox and final drive shafts", "construction equipment swing pivots", "printing press cylinder journals", "shock-loaded start-stop service such as clutch and kick-starter mechanisms" ], "failure_modes": [ "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell" ], "pitfalls": [ "Pressing HK3512CV2 (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.", "HK3512CV2 carries a maker-specific variant code after the size: when substituting another brand, match the printed 35×42×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 12 mm standard width of HK3512CV2 is the general-purpose section at 35 mm shaft; wider HK variants in the same 35×42 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Needle rollers tolerate almost no misalignment; if the 42 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell." ], "faq": [ { "q": "What are the dimensions of a HK3512CV2 needle roller bearing?", "a": "A HK3512CV2 drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3512CV2 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3512CV2, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3512CV2 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3512CV2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK3512CV2 retained in the housing?", "a": "The thin-walled drawn cup of HK3512CV2 is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What duty conditions suit a HK3512CV2 drawn-cup bearing?", "a": "HK3512CV2 is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (4700/7000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3516CT", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 35, "D_mm": 42, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 19, "static_load_kN": 33.5, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 4700, "speed_oil_rpm": 7000, "weight_g": 37, "manufacturer_designation": "HK3516CT", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3516CT" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3516CT is built around a thin hardened steel cup.Its printed envelope — 35 mm under-roller diameter, 42 mm outside diameter, 16 mm width — is fixed by ISO 3245; the 35 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.", "applications": [ "machine tool feed drive supports", "marine steering and linkage shafts", "rolling mill auxiliary drives", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "HK3516CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 35×42×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 16 mm standard width of HK3516CT is the general-purpose section at 35 mm shaft; wider HK variants in the same 35×42 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Pressing HK3516CT (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder." ], "faq": [ { "q": "What does Fw mean on a HK3516CT drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3516CT, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3516CT needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3516CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK3516CT retained in the housing?", "a": "The thin-walled drawn cup of HK3516CT is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What are the dimensions of a HK3516CT needle roller bearing?", "a": "A HK3516CT drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK3520", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 35, "D_mm": 42, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 24.8, "static_load_kN": 47.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 4700, "speed_oil_rpm": 7000, "weight_g": 46, "manufacturer_designation": "HK3520", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK3520" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3520 is built around a thin hardened steel cup.Its printed envelope — 35 mm under-roller diameter, 42 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 35 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Model and hobby drivetrains, from RC cars to small robotics, use this size because the thin cup lets designers shrink the gearbox around the gears rather than around the bearing. For low-temperature service, verify the grease is rated for the minimum ambient — a standard lithium grease in this cup will stiffen and starve the rollers on a cold start.", "applications": [ "machine tool feed drive supports", "marine steering and linkage shafts", "rolling mill auxiliary drives", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "Pressing HK3520 (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.", "With no suffix letters, HK3520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 35×42×20 mm match exactly — suffix conventions for cage and shell variants differ between makers.", "The 20 mm wide section of HK3520 gains rating through longer rollers at 35 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 35×42 mm narrow variant.", "HK3520 runs directly on the shaft: the 35 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK3520 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty." ], "faq": [ { "q": "What are the dimensions of a HK3520 needle roller bearing?", "a": "A HK3520 drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK3520 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3520, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK3520 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK3520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "How is a HK3520 retained in the housing?", "a": "The thin-walled drawn cup of HK3520 is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid." }, { "q": "What duty conditions suit a HK3520 drawn-cup bearing?", "a": "HK3520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (4700/7000 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK4012V2", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 40, "D_mm": 47, "B_mm": 12, "seal_type": "open", "dynamic_load_kN": 12.1, "static_load_kN": 19.5, "fatigue_load_limit_kN": 2.38, "limiting_speed_rpm": 4000, "speed_oil_rpm": 6000, "weight_g": 31, "manufacturer_designation": "HK4012V2", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK4012V2", "HK4012V2+IR35x40x12.5" ], "naming_rule_text": "In the HK-series (ISO 3245), HK4012V2 is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 40 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 47 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.", "applications": [ "printing press cylinder journals", "machine tool feed drive supports", "marine steering and linkage shafts", "compact linkages where the cup doubles as both bearing and structural spacer" ], "failure_modes": [ "grease starvation in the open-end arrangement with no relubrication path", "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection" ], "pitfalls": [ "The 12 mm standard width of HK4012V2 is the general-purpose section at 40 mm shaft; wider HK variants in the same 40×47 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "HK4012V2 runs directly on the shaft: the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.", "The open ends of HK4012V2 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "The press-fit of HK4012V2 at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "HK4012V2 carries a maker-specific variant code after the size: when substituting another brand, match the printed 40×47×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers." ], "faq": [ { "q": "Can a HK4012V2 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK4012V2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK4012V2 need a hardened shaft?", "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x12.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK4012V2 drawn-cup bearing?", "a": "HK4012V2 is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (4000/6000 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK4012V2 needle roller bearing?", "a": "A HK4012V2 drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK4012V2 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4012V2, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK4016CT", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 40, "D_mm": 47, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 20.3, "static_load_kN": 38.5, "fatigue_load_limit_kN": 4.7, "limiting_speed_rpm": 4000, "speed_oil_rpm": 6000, "weight_g": 41, "manufacturer_designation": "HK4016CT", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK4016CT", "HK4016CT+IR35x40x17" ], "naming_rule_text": "HK4016CT is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 40 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 47 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "machine tool feed drive supports", "marine steering and linkage shafts", "rolling mill auxiliary drives", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "The press-fit of HK4016CT at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "HK4016CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 40×47×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.", "The 16 mm standard width of HK4016CT is the general-purpose section at 40 mm shaft; wider HK variants in the same 40×47 mm envelope carry more load and are not interchangeable if the housing width is fixed." ], "faq": [ { "q": "Does HK4016CT need a hardened shaft?", "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x17) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK4016CT needle roller bearing?", "a": "A HK4016CT drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK4016CT drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4016CT, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK4016CT needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK4016CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK4020F", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 40, "D_mm": 47, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 25.9, "static_load_kN": 52.5, "fatigue_load_limit_kN": 6.4, "limiting_speed_rpm": 4000, "speed_oil_rpm": 6000, "weight_g": 52, "manufacturer_designation": "HK4020F", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK4020F", "HK4020F+IR35x40x20.5" ], "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK4020F is built around a thin hardened steel cup.Its printed envelope — 40 mm under-roller diameter, 47 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 40 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.", "applications": [ "printing press cylinder journals", "machine tool feed drive supports", "marine steering and linkage shafts", "lightly loaded high-speed idler positions where roller skidding must be watched" ], "failure_modes": [ "cage wear or fracture from sustained operation near the limiting speed", "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat" ], "pitfalls": [ "The press-fit of HK4020F at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "The cage in HK4020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 40 mm.", "The 20 mm wide section of HK4020F gains rating through longer rollers at 40 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 40×47 mm narrow variant.", "The HK4020F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life." ], "faq": [ { "q": "What are the dimensions of a HK4020F needle roller bearing?", "a": "A HK4020F drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK4020F drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4020F, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK4020F needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK4020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK4020F need a hardened shaft?", "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x20.5) so a standard unhardened shaft can be used." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK4516", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 45, "D_mm": 52, "B_mm": 16, "seal_type": "open", "dynamic_load_kN": 21.6, "static_load_kN": 43, "fatigue_load_limit_kN": 5.25, "limiting_speed_rpm": 3700, "speed_oil_rpm": 5500, "weight_g": 46, "manufacturer_designation": "HK4516", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK4516", "HK4516+IR40x45x17" ], "naming_rule_text": "HK4516 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 45 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 52 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.", "applications": [ "rolling mill auxiliary drives", "heavy gearbox and final drive shafts", "construction equipment swing pivots", "reciprocating or oscillating motion where the rollers never complete a full revolution" ], "failure_modes": [ "raceway spalling on a shaft that was below the required 58–64 HRC hardness", "edge loading and needle skewing under shaft misalignment or deflection", "cage wear or fracture from sustained operation near the limiting speed" ], "pitfalls": [ "With no suffix letters, HK4516 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 45×52×16 mm match exactly — suffix conventions for cage and shell variants differ between makers.", "The 16 mm standard width of HK4516 is the general-purpose section at 45 mm shaft; wider HK variants in the same 45×52 mm envelope carry more load and are not interchangeable if the housing width is fixed.", "The open ends of HK4516 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "The press-fit of HK4516 at 45 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row." ], "faq": [ { "q": "What does Fw mean on a HK4516 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4516, Fw = 45 mm, so the shaft must be machined to 45 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK4516 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK4516 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK4516 need a hardened shaft?", "a": "Either the 45 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x45x17) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK4516 needle roller bearing?", "a": "A HK4516 drawn-cup needle roller bearing has a 45 mm shaft diameter (Fw, under-roller diameter), 52 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK4520", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 45, "D_mm": 52, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 27.6, "static_load_kN": 59, "fatigue_load_limit_kN": 7.2, "limiting_speed_rpm": 3700, "speed_oil_rpm": 5500, "weight_g": 58, "manufacturer_designation": "HK4520", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK4520", "HK4520+IR40x45x20.5" ], "naming_rule_text": "HK4520 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 45 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 52 mm and the width is 20 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.", "applications": [ "construction equipment swing pivots", "printing press cylinder journals", "machine tool feed drive supports", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "The 20 mm wide section of HK4520 gains rating through longer rollers at 45 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 45×52 mm narrow variant.", "Needle rollers tolerate almost no misalignment; if the 52 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.", "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.", "Pressing HK4520 (45 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.", "With no suffix letters, HK4520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 45×52×20 mm match exactly — suffix conventions for cage and shell variants differ between makers." ], "faq": [ { "q": "Can a HK4520 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK4520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK4520 need a hardened shaft?", "a": "Either the 45 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x45x20.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK4520 drawn-cup bearing?", "a": "HK4520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (3700/5500 rpm) and radial load against the actual duty before finalizing." }, { "q": "What are the dimensions of a HK4520 needle roller bearing?", "a": "A HK4520 drawn-cup needle roller bearing has a 45 mm shaft diameter (Fw, under-roller diameter), 52 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK4520 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4520, Fw = 45 mm, so the shaft must be machined to 45 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK5020", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 50, "D_mm": 58, "B_mm": 20, "seal_type": "open", "dynamic_load_kN": 31.5, "static_load_kN": 63, "fatigue_load_limit_kN": 7.7, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4800, "weight_g": 72, "manufacturer_designation": "HK5020", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK5020", "HK5020+IR40x50x22" ], "naming_rule_text": "NTN HK5020 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 50 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 58 mm outside and 20 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.", "applications": [ "heavy gearbox and final drive shafts", "construction equipment swing pivots", "printing press cylinder journals", "dirty environments where the open ends rely entirely on the housing seals" ], "failure_modes": [ "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends", "brinelling of the drawn cup from hammer blows during press-in mounting" ], "pitfalls": [ "The 20 mm wide section of HK5020 gains rating through longer rollers at 50 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 50×58 mm narrow variant.", "The open ends of HK5020 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.", "The press-fit of HK5020 at 50 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.", "With no suffix letters, HK5020 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 50×58×20 mm match exactly — suffix conventions for cage and shell variants differ between makers." ], "faq": [ { "q": "Can a HK5020 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK5020 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK5020 need a hardened shaft?", "a": "Either the 50 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x50x22) so a standard unhardened shaft can be used." }, { "q": "What are the dimensions of a HK5020 needle roller bearing?", "a": "A HK5020 drawn-cup needle roller bearing has a 50 mm shaft diameter (Fw, under-roller diameter), 58 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK5020 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK5020, Fw = 50 mm, so the shaft must be machined to 50 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "HK5025", "brand": "NTN", "series": "HK-series", "type": "needle", "d_mm": 50, "D_mm": 58, "B_mm": 25, "seal_type": "open", "dynamic_load_kN": 38.5, "static_load_kN": 82, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 3200, "speed_oil_rpm": 4800, "weight_g": 90, "manufacturer_designation": "HK5025", "standard": "ISO 3245", "source_ref": "https://www.ntnglobal.com/", "catalog_ver": "CAT. No. 2203-3/E 2024", "extracted_at": "2026-09-25", "aliases": [ "HK5025", "HK5025+IR45x50x25.5" ], "naming_rule_text": "NTN HK5025 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 50 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 58 mm outside and 25 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. At this shaft size the cup carries substantial radial load, but correct press-fit practice and housing rigidity become decisive for reaching the calculated life. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.", "applications": [ "heavy gearbox and final drive shafts", "construction equipment swing pivots", "printing press cylinder journals", "continuous high-speed rotation where grease redistribution is the limiting factor" ], "failure_modes": [ "cup cracking from an oval or tapered housing bore distorting the thin shell", "fretting of the cup outer surface in a soft or worn housing seat", "scoring of the needle rollers from abrasive contamination past the open ends" ], "pitfalls": [ "At a 50 mm shaft diameter the press-in force for HK5025 is substantial; use a press with a guided mandrel and confirm the cup seats against the housing shoulder — a cocked cup concentrates load on the outermost roller row.", "With no suffix letters, HK5025 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 50×58×25 mm match exactly — suffix conventions for cage and shell variants differ between makers.", "The 25 mm extra-wide section of HK5025 (double-row or extended roller set) is the high-capacity option at 50 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 25 mm width.", "Drawn-cup needle bearings carry radial load only: HK5025 provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.", "The HK5025 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life." ], "faq": [ { "q": "What are the dimensions of a HK5025 needle roller bearing?", "a": "A HK5025 drawn-cup needle roller bearing has a 50 mm shaft diameter (Fw, under-roller diameter), 58 mm outside diameter and 25 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway." }, { "q": "What does Fw mean on a HK5025 drawn-cup bearing?", "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK5025, Fw = 50 mm, so the shaft must be machined to 50 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted." }, { "q": "Can a HK5025 needle roller bearing carry axial load?", "a": "No. Drawn-cup needle roller bearings like HK5025 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement." }, { "q": "Does HK5025 need a hardened shaft?", "a": "Either the 50 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR45x50x25.5) so a standard unhardened shaft can be used." }, { "q": "What duty conditions suit a HK5025 drawn-cup bearing?", "a": "HK5025 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (3200/4800 rpm) and radial load against the actual duty before finalizing." } ], "confidence_score": 0.7, "status": "published", "last_verified": "2026-09-25" }, { "sku": "6200", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 31, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "The open 6200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6200 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6200 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6200-2Z (shields) and 6200-2RSH (contact seals), not suffix-free 6200.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200 bearing?", "a": "A 6200 deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6200 mean?", "a": "A bare 6200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200 — the open (unsealed) execution, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 36000 r/min, mass 31 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6200", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6200-2Z.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6200-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6200-2RS for that.", "Shielded 6200-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6200-2Z (one shield: 6200-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6200-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6200-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-ZZ bearing?", "a": "A 6200-ZZ deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6200-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2Z — two non-contact sheet-metal shields, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200-ZZ." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2Z", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6200-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6200-2RS runs slower and cooler-limited than the open 6200; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6200-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6200-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed. The single-seal catalogue number is 6200-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6200-RSH exists for arrangements that lubricate through the open side; fitting 6200-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-2RS bearing?", "a": "A 6200-2RS deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 29 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6200-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSH — two contact elastomer seals over a lifetime grease fill, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6200-2RS." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6200-2RSH", "material": "GCr15", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "The open 6201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6201 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6201.", "The open 6201 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6201-2Z (shields) and 6201-2RSH (contact seals), not suffix-free 6201.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201 bearing?", "a": "A 6201 deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6201 mean?", "a": "A bare 6201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201 — the open (unsealed) execution, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 32000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6201", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6201-2Z.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6201-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6201-2RS for that.", "Shielded 6201-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6201-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6201-2Z (one shield: 6201-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6201-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6201-2Z for high-contamination positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-ZZ bearing?", "a": "A 6201-ZZ deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6201-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2Z — two non-contact sheet-metal shields, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201-ZZ." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2Z", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6201-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6201-2RS runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6201-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6201-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6201-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6201-RSH exists for arrangements that lubricate through the open side; fitting 6201-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-2RS bearing?", "a": "A 6201-2RS deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6201-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSH — two contact elastomer seals over a lifetime grease fill, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 15000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6201-2RS." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6201-2RSH", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "The open 6202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6202 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6202 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6202-2Z (shields) and 6202-2RSH (contact seals), not suffix-free 6202.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202 bearing?", "a": "A 6202 deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6202 mean?", "a": "A bare 6202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202 — the open (unsealed) execution, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 28000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6202", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 48, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6202-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6202-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6202-2RS for that.", "Shielded 6202-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6202-2Z (one shield: 6202-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6202-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6202-2Z for high-contamination positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-ZZ bearing?", "a": "A 6202-ZZ deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6202-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2Z — two non-contact sheet-metal shields, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 48 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202-ZZ." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2Z", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6202-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6202-2RS runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6202-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6202-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed. The single-seal catalogue number is 6202-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6202-RSH exists for arrangements that lubricate through the open side; fitting 6202-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-2RS bearing?", "a": "A 6202-2RS deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 44 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6202-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSH — two contact elastomer seals over a lifetime grease fill, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6202-2RS." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6202-2RSH", "material": "GCr15", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 65, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "The open 6203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6203 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "The open 6203 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6203-2Z (shields) and 6203-2RSH (contact seals), not suffix-free 6203.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203 bearing?", "a": "A 6203 deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6203 mean?", "a": "A bare 6203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203 — the open (unsealed) execution, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 24000 r/min, mass 65 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6203", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 68, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6203-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6203-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6203-2RS for that.", "Shielded 6203-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6203-2Z (one shield: 6203-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6203-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6203-2Z for high-contamination positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-ZZ bearing?", "a": "A 6203-ZZ deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6203-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2Z — two non-contact sheet-metal shields, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 68 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203-ZZ." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6203-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6203-2RS runs slower and cooler-limited than the open 6203; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6203-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 40 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6203-2RS.", "SKF catalogues the contact-sealed version as 6203-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6203-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6203-RSH exists for arrangements that lubricate through the open side; fitting 6203-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-2RS bearing?", "a": "A 6203-2RS deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 63 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6203-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSH — two contact elastomer seals over a lifetime grease fill, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 12000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6203-2RS." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6203-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "The open 6204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6204 units.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6204 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6204-2Z (shields) and 6204-2RSH (contact seals), not suffix-free 6204.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204 bearing?", "a": "A 6204 deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6204 mean?", "a": "A bare 6204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204 — the open (unsealed) execution, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 20000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6204", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6204-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6204-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6204-2RS for that.", "Shielded 6204-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6204-2Z (one shield: 6204-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6204-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6204-2Z for high-contamination positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-ZZ bearing?", "a": "A 6204-ZZ deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6204-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2Z — two non-contact sheet-metal shields, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204-ZZ." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2Z", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6204-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6204-2RS runs slower and cooler-limited than the open 6204; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6204-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6204-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6204-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6204-RSH exists for arrangements that lubricate through the open side; fitting 6204-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-2RS bearing?", "a": "A 6204-2RS deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 101 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6204-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSH — two contact elastomer seals over a lifetime grease fill, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 10000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6204-2RS." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6204-2RSH", "material": "GCr15", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "The open 6205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6205 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6205 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6205-2Z (shields) and 6205-2RSH (contact seals), not suffix-free 6205.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205 bearing?", "a": "A 6205 deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6205 mean?", "a": "A bare 6205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205 — the open (unsealed) execution, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 18000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6205", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6205-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6205-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6205-2RS for that.", "Shielded 6205-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-ZZ.", "SKF spells the shielded version 6205-2Z (one shield: 6205-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6205-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6205-2Z for high-contamination positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-ZZ bearing?", "a": "A 6205-ZZ deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6205-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2Z — two non-contact sheet-metal shields, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205-ZZ." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2Z", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6205-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6205-2RS runs slower and cooler-limited than the open 6205; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6205-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6205-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6205-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 28000 r/min thermal reference speed. The single-seal catalogue number is 6205-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6205-RSH exists for arrangements that lubricate through the open side; fitting 6205-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-2RS bearing?", "a": "A 6205-2RS deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6205-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSH — two contact elastomer seals over a lifetime grease fill, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 8500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6205-2RS." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6205-2RSH", "material": "GCr15", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "The open 6206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6206 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6206 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6206-2Z (shields) and 6206-2RSH (contact seals), not suffix-free 6206.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206 bearing?", "a": "A 6206 deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6206 mean?", "a": "A bare 6206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206 — the open (unsealed) execution, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 15000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6206", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6206-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6206-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6206-2RS for that.", "Shielded 6206-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6206-2Z (one shield: 6206-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6206-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6206-2Z for high-contamination positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-ZZ bearing?", "a": "A 6206-ZZ deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6206-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2Z — two non-contact sheet-metal shields, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 210 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206-ZZ." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2Z", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6206-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6206-2RS runs slower and cooler-limited than the open 6206; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6206-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6206-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6206-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6206-RSH exists for arrangements that lubricate through the open side; fitting 6206-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-2RS bearing?", "a": "A 6206-2RS deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 189 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6206-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RSH — two contact elastomer seals over a lifetime grease fill, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 7500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6206-2RS." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6206-2RSH", "material": "GCr15", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "The open 6207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6207 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6207.", "The open 6207 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6207-2Z (shields) and 6207-2RSH (contact seals), not suffix-free 6207.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207 bearing?", "a": "A 6207 deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6207 mean?", "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207 — the open (unsealed) execution, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 13000 r/min, mass 290 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6207", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6207-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6207-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.", "Shielded 6207-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6207-2Z (one shield: 6207-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6207-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6207-2Z for high-contamination positions.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-ZZ bearing?", "a": "A 6207-ZZ deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6207-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2Z — two non-contact sheet-metal shields, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 10000 r/min, mass 300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207-ZZ." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2Z", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6207-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6207-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6207-2RS runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6207-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6207-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6207-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6207-RSH exists for arrangements that lubricate through the open side; fitting 6207-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 27/15.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6207-2RS bearing?", "a": "A 6207-2RS deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 270 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6207 bore code work?", "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6207-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 35 mm bore?", "a": "The '2' is the light diameter series: 72×17 mm with a 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6207-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6207-2RSH — two contact elastomer seals over a lifetime grease fill, 35×72×17 mm per ISO 15. Quoted values: C 27 kN, C0 15.3 kN, Pu 0.655 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6207-2RS." } ], "cross_ref": [ { "equiv_sku": "6207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7207", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU207", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6207-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6207-2RSH", "material": "GCr15", "dynamic_load_kN": 27, "static_load_kN": 15.3, "fatigue_load_limit_kN": 0.655, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "The open 6208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6208 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6208 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6208-2Z (shields) and 6208-2RSH (contact seals), not suffix-free 6208.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208 bearing?", "a": "A 6208 deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6208 mean?", "a": "A bare 6208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208 — the open (unsealed) execution, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 11000 r/min, mass 370 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6208", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6208-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6208-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6208-2RS for that.", "Shielded 6208-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6208-2Z (one shield: 6208-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6208-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6208-2Z for high-contamination positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-ZZ bearing?", "a": "A 6208-ZZ deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6208-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2Z — two non-contact sheet-metal shields, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208-ZZ." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2Z", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6208-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6208-2RS runs slower and cooler-limited than the open 6208; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6208-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6208-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6208-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6208-RSH exists for arrangements that lubricate through the open side; fitting 6208-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-2RS bearing?", "a": "A 6208-2RS deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 346 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6208-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RSH — two contact elastomer seals over a lifetime grease fill, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 5600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6208-2RS." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6208-2RSH", "material": "GCr15", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "The open 6209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6209 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-C3. No clearance suffix means normal CN clearance.", "The open 6209 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6209-2Z (shields) and 6209-2RSH (contact seals), not suffix-free 6209.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209 bearing?", "a": "A 6209 deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6209 mean?", "a": "A bare 6209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209 — the open (unsealed) execution, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 11000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6209", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6209-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6209-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6209-2RS for that.", "Shielded 6209-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6209-2Z (one shield: 6209-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6209-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6209-2Z for high-contamination positions.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-ZZ bearing?", "a": "A 6209-ZZ deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6209-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2Z — two non-contact sheet-metal shields, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.92 kN, limiting speed 8500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209-ZZ." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.92, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6209-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 420, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6209-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6209-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6209-2RS runs slower and cooler-limited than the open 6209; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6209-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6209-2RS.", "SKF catalogues the contact-sealed version as 6209-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6209-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6209-RSH exists for arrangements that lubricate through the open side; fitting 6209-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/21.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6209-2RS bearing?", "a": "A 6209-2RS deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 396 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6209 bore code work?", "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6209-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 45 mm bore?", "a": "The '2' is the light diameter series: 85×19 mm with a 20.0 mm radial section at 45 mm bore. A 6309 on the same bore is larger and higher-rated; a 6009 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6209-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6209-2RSH — two contact elastomer seals over a lifetime grease fill, 45×85×19 mm per ISO 15. Quoted values: C 35.1 kN, C0 21.6 kN, Pu 0.915 kN, limiting speed 5000 r/min, mass 420 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6209-2RS." } ], "cross_ref": [ { "equiv_sku": "6209", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7209", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU209", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6209-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6209-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "The open 6210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.", "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6210 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6210-2Z (shields) and 6210-2RSH (contact seals), not suffix-free 6210.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210 bearing?", "a": "A 6210 deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6210 mean?", "a": "A bare 6210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210 — the open (unsealed) execution, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 10000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6210", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6210-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6210-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.", "Shielded 6210-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6210-2Z (one shield: 6210-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6210-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6210-2Z for high-contamination positions.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-ZZ bearing?", "a": "A 6210-ZZ deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6210-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2Z — two non-contact sheet-metal shields, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 8000 r/min, mass 470 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210-ZZ." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2Z", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6210-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6210-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6210-2RS runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6210-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6210-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6210-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6210-RSH exists for arrangements that lubricate through the open side; fitting 6210-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 37.1/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6210-2RS bearing?", "a": "A 6210-2RS deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 449 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6210 bore code work?", "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6210-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 50 mm bore?", "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6210-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6210-2RSH — two contact elastomer seals over a lifetime grease fill, 50×90×20 mm per ISO 15. Quoted values: C 37.1 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4800 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6210-2RS." } ], "cross_ref": [ { "equiv_sku": "6210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7210", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU210", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6210-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6210-2RSH", "material": "GCr15", "dynamic_load_kN": 37.1, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "The open 6211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6211 units.", "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6211 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6211-2Z (shields) and 6211-2RSH (contact seals), not suffix-free 6211.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211 bearing?", "a": "A 6211 deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6211 mean?", "a": "A bare 6211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211 — the open (unsealed) execution, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 9000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6211", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6211-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6211-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6211-2RS for that.", "Shielded 6211-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6211-ZZ.", "SKF spells the shielded version 6211-2Z (one shield: 6211-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6211-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6211-2Z for high-contamination positions.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-ZZ bearing?", "a": "A 6211-ZZ deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6211-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2Z — two non-contact sheet-metal shields, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211-ZZ." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2Z", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6211-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 620, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6211-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6211-2RS runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6211-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6211-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6211-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6211-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6211-RSH exists for arrangements that lubricate through the open side; fitting 6211-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 46.2/29 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6211-2RS bearing?", "a": "A 6211-2RS deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 587 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6211 bore code work?", "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6211-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 55 mm bore?", "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6211-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6211-2RSH — two contact elastomer seals over a lifetime grease fill, 55×100×21 mm per ISO 15. Quoted values: C 46.2 kN, C0 29 kN, Pu 1.25 kN, limiting speed 4300 r/min, mass 620 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6211-2RS." } ], "cross_ref": [ { "equiv_sku": "6211", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7211", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU211", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6211-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6211-2RSH", "material": "GCr15", "dynamic_load_kN": 46.2, "static_load_kN": 29, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 780, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "The open 6212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6212 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6212 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6212-2Z (shields) and 6212-2RSH (contact seals), not suffix-free 6212.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212 bearing?", "a": "A 6212 deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6212 mean?", "a": "A bare 6212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212 — the open (unsealed) execution, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 8000 r/min, mass 780 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6212", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 810, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6212-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6212-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.", "Shielded 6212-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6212-2Z (one shield: 6212-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6212-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6212-2Z for high-contamination positions.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-ZZ bearing?", "a": "A 6212-ZZ deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6212-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2Z — two non-contact sheet-metal shields, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 6300 r/min, mass 810 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212-ZZ." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6212-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 790, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6212-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6212 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6212-2RS runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6212-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6212-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6212-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6212-RSH exists for arrangements that lubricate through the open side; fitting 6212-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6212-2RS bearing?", "a": "A 6212-2RS deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 749 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6212 bore code work?", "a": "The last two digits of 6212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6212-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 60 mm bore?", "a": "The '2' is the light diameter series: 110×22 mm with a 25.0 mm radial section at 60 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6212-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6212-2RSH — two contact elastomer seals over a lifetime grease fill, 60×110×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 36 kN, Pu 1.53 kN, limiting speed 4000 r/min, mass 790 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6212-2RS." } ], "cross_ref": [ { "equiv_sku": "6212", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7212", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU212", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6212-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6212-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 36, "fatigue_load_limit_kN": 1.53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "The open 6213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6213 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6213.", "The open 6213 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6213-2Z (shields) and 6213-2RSH (contact seals), not suffix-free 6213.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213 bearing?", "a": "A 6213 deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 938 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6213 mean?", "a": "A bare 6213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6213?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213 — the open (unsealed) execution, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 7500 r/min, mass 1000 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6213", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6213-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6213-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6213-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.", "Shielded 6213-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6213-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6213-2Z (one shield: 6213-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6213-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6213-2Z for high-contamination positions.", "The 58.5/40.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6213-ZZ bearing?", "a": "A 6213-ZZ deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 938 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6213 bore code work?", "a": "The last two digits of 6213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6213-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 65 mm bore?", "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6213-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6213-2Z — two non-contact sheet-metal shields, 65×120×23 mm per ISO 15. Quoted values: C 58.5 kN, C0 40.5 kN, Pu 1.73 kN, limiting speed 6000 r/min, mass 1050 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6213-ZZ." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7213", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU213", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6213-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6213-2Z", "material": "GCr15", "dynamic_load_kN": 58.5, "static_load_kN": 40.5, "fatigue_load_limit_kN": 1.73, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "The open 6214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6214 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6214 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6214-2Z (shields) and 6214-2RSH (contact seals), not suffix-free 6214.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214 bearing?", "a": "A 6214 deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6214 mean?", "a": "A bare 6214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214 — the open (unsealed) execution, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 7000 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6214", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6214-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6214-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.", "Shielded 6214-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6214-2Z (one shield: 6214-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6214-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6214-2Z for high-contamination positions.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-ZZ bearing?", "a": "A 6214-ZZ deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6214-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2Z — two non-contact sheet-metal shields, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 5600 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214-ZZ." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6214-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6214-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6214-2RS runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6214-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6214-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6214-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6214-RS1 exists for arrangements that lubricate through the open side; fitting 6214-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6214-2RS bearing?", "a": "A 6214-2RS deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1032 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6214 bore code work?", "a": "The last two digits of 6214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6214-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 70 mm bore?", "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6214-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6214-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×125×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3400 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6214-2RS." } ], "cross_ref": [ { "equiv_sku": "6214", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7214", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU214", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6214-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6214-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "The open 6215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6215-C3. No clearance suffix means normal CN clearance.", "The open 6215 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6215-2Z (shields) and 6215-2RSH (contact seals), not suffix-free 6215.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215 bearing?", "a": "A 6215 deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6215 mean?", "a": "A bare 6215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215 — the open (unsealed) execution, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 6700 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6215", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6215-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6215-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6215-2RS for that.", "Shielded 6215-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6215-2Z (one shield: 6215-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6215-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6215-2Z for high-contamination positions.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-ZZ bearing?", "a": "A 6215-ZZ deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6215-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2Z — two non-contact sheet-metal shields, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 5300 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215-ZZ." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2Z", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6215-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6215-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6215 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6215-2RS runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6215-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6215-2RS.", "SKF catalogues the contact-sealed version as 6215-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6215-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6215-RS1 exists for arrangements that lubricate through the open side; fitting 6215-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 68.9/49 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6215-2RS bearing?", "a": "A 6215-2RS deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1130 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6215 bore code work?", "a": "The last two digits of 6215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6215-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 75 mm bore?", "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6215-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6215-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×130×25 mm per ISO 15. Quoted values: C 68.9 kN, C0 49 kN, Pu 2.04 kN, limiting speed 3200 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6215-2RS." } ], "cross_ref": [ { "equiv_sku": "6215", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7215", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU215", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6215-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6215-2RS1", "material": "GCr15", "dynamic_load_kN": 68.9, "static_load_kN": 49, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "The open 6216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6216 units.", "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6216 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6216-2Z (shields) and 6216-2RSH (contact seals), not suffix-free 6216.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216 bearing?", "a": "A 6216 deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6216 mean?", "a": "A bare 6216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216 — the open (unsealed) execution, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 6000 r/min, mass 1450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6216", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6216-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6216-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6216-2RS for that.", "Shielded 6216-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6216-2Z (one shield: 6216-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6216-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6216-2Z for high-contamination positions.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-ZZ bearing?", "a": "A 6216-ZZ deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6216-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2Z — two non-contact sheet-metal shields, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 4800 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216-ZZ." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2Z", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6216-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6216-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6216-2RS runs slower and cooler-limited than the open 6216; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6216-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6216-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6216-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6216-RS1 exists for arrangements that lubricate through the open side; fitting 6216-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 72.8/55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6216-2RS bearing?", "a": "A 6216-2RS deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1375 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6216 bore code work?", "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6216-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 80 mm bore?", "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6216-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6216-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×140×26 mm per ISO 15. Quoted values: C 72.8 kN, C0 55 kN, Pu 2.2 kN, limiting speed 3000 r/min, mass 1500 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6216-2RS." } ], "cross_ref": [ { "equiv_sku": "6216", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7216", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU216", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6216-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6216-2RS1", "material": "GCr15", "dynamic_load_kN": 72.8, "static_load_kN": 55, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "The open 6217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6217 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6217-2Z (shields) and 6217-2RSH (contact seals), not suffix-free 6217.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217 bearing?", "a": "A 6217 deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6217 mean?", "a": "A bare 6217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217 — the open (unsealed) execution, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6217", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6217-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6217-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6217-2RS for that.", "Shielded 6217-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6217-ZZ.", "SKF spells the shielded version 6217-2Z (one shield: 6217-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6217-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6217-2Z for high-contamination positions.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-ZZ bearing?", "a": "A 6217-ZZ deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6217-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2Z — two non-contact sheet-metal shields, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 4500 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217-ZZ." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2Z", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6217-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6217-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6217-2RS runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6217-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6217-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6217-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6217-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6217-RS1 exists for arrangements that lubricate through the open side; fitting 6217-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 87.1/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6217-2RS bearing?", "a": "A 6217-2RS deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1714 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6217 bore code work?", "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6217-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 85 mm bore?", "a": "The '2' is the light diameter series: 150×28 mm with a 32.5 mm radial section at 85 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6217-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6217-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×150×28 mm per ISO 15. Quoted values: C 87.1 kN, C0 64 kN, Pu 2.5 kN, limiting speed 2800 r/min, mass 1900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6217-2RS." } ], "cross_ref": [ { "equiv_sku": "6217", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7217", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU217", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6217-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6217-2RS1", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 64, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "The open 6218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6218 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6218-2Z (shields) and 6218-2RSH (contact seals), not suffix-free 6218.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218 bearing?", "a": "A 6218 deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6218 mean?", "a": "A bare 6218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218 — the open (unsealed) execution, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 5300 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6218", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6218-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6218-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6218-2RS for that.", "Shielded 6218-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6218-2Z (one shield: 6218-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6218-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6218-2Z for high-contamination positions.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-ZZ bearing?", "a": "A 6218-ZZ deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6218-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2Z — two non-contact sheet-metal shields, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 4300 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218-ZZ." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2Z", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6218-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6218-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6218-2RS runs slower and cooler-limited than the open 6218; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6218-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6218-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6218-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6218-RS1 exists for arrangements that lubricate through the open side; fitting 6218-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 101/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6218-2RS bearing?", "a": "A 6218-2RS deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2104 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6218 bore code work?", "a": "The last two digits of 6218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6218-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 90 mm bore?", "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6218-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6218-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×160×30 mm per ISO 15. Quoted values: C 101 kN, C0 73.5 kN, Pu 2.8 kN, limiting speed 2600 r/min, mass 2300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6218-2RS." } ], "cross_ref": [ { "equiv_sku": "6218", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7218", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU218", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6218-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6218-2RS1", "material": "GCr15", "dynamic_load_kN": 101, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "The open 6219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6219 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6219.", "The open 6219 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6219-2Z (shields) and 6219-2RSH (contact seals), not suffix-free 6219.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219 bearing?", "a": "A 6219 deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6219 mean?", "a": "A bare 6219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219 — the open (unsealed) execution, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6219", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6219-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6219-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6219-2RS for that.", "Shielded 6219-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6219-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6219-2Z (one shield: 6219-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6219-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6219-2Z for high-contamination positions.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-ZZ bearing?", "a": "A 6219-ZZ deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6219-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2Z — two non-contact sheet-metal shields, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 4000 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219-ZZ." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2Z", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6219-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6219-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6219-2RS runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6219-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6219-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6219-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6219-RS1 exists for arrangements that lubricate through the open side; fitting 6219-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 114/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6219-2RS bearing?", "a": "A 6219-2RS deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2549 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6219 bore code work?", "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6219-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 95 mm bore?", "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6219-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6219-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×170×32 mm per ISO 15. Quoted values: C 114 kN, C0 81.5 kN, Pu 3 kN, limiting speed 2400 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6219-2RS." } ], "cross_ref": [ { "equiv_sku": "6219", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7219", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU219", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6219-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6219-2RS1", "material": "GCr15", "dynamic_load_kN": 114, "static_load_kN": 81.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "The open 6220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6220 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6220-2Z (shields) and 6220-2RSH (contact seals), not suffix-free 6220.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220 bearing?", "a": "A 6220 deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6220 mean?", "a": "A bare 6220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220 — the open (unsealed) execution, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 4800 r/min, mass 3200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6220", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6220-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6220-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.", "Shielded 6220-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6220-2Z (one shield: 6220-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6220-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6220-2Z for high-contamination positions.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-ZZ bearing?", "a": "A 6220-ZZ deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6220-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2Z — two non-contact sheet-metal shields, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 3800 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220-ZZ." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2Z", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6220-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6220-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6220-2RS runs slower and cooler-limited than the open 6220; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6220-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6220-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6220-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6220-RS1 exists for arrangements that lubricate through the open side; fitting 6220-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 127/93 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6220-2RS bearing?", "a": "A 6220-2RS deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3052 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6220 bore code work?", "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6220-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 100 mm bore?", "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6220-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6220-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×180×34 mm per ISO 15. Quoted values: C 127 kN, C0 93 kN, Pu 3.35 kN, limiting speed 2400 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6220-2RS." } ], "cross_ref": [ { "equiv_sku": "6220", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7220", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU220", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6220-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6220-2RS1", "material": "GCr15", "dynamic_load_kN": 127, "static_load_kN": 93, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "The open 6221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6221 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6221-C3. No clearance suffix means normal CN clearance.", "The open 6221 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6221-2Z (shields) and 6221-2RSH (contact seals), not suffix-free 6221.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221 bearing?", "a": "A 6221 deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3618 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6221 mean?", "a": "A bare 6221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221 — the open (unsealed) execution, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 4500 r/min, mass 3800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6221", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6221-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6221-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6221-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6221-2RS for that.", "Shielded 6221-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6221-2Z (one shield: 6221-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6221-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6221-2Z for high-contamination positions.", "The 140/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6221-ZZ bearing?", "a": "A 6221-ZZ deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3618 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6221 bore code work?", "a": "The last two digits of 6221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6221-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 105 mm bore?", "a": "The '2' is the light diameter series: 190×36 mm with a 42.5 mm radial section at 105 mm bore. A 6321 on the same bore is larger and higher-rated; a 6021 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6221-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6221-2Z — two non-contact sheet-metal shields, 105×190×36 mm per ISO 15. Quoted values: C 140 kN, C0 104 kN, Pu 3.65 kN, limiting speed 3600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6221-ZZ." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7221", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6221-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6221-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 104, "fatigue_load_limit_kN": 3.65, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "The open 6222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6222 units.", "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6222 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6222-2Z (shields) and 6222-2RSH (contact seals), not suffix-free 6222.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222 bearing?", "a": "A 6222 deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6222 mean?", "a": "A bare 6222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222 — the open (unsealed) execution, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 4300 r/min, mass 4450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6222", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-ZZ", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6222-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6222-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.", "Shielded 6222-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6222-2Z (one shield: 6222-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6222-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6222-2Z for high-contamination positions.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-ZZ bearing?", "a": "A 6222-ZZ deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6222-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2Z — two non-contact sheet-metal shields, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 3400 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222-ZZ." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6222-2RS", "brand": "SKF", "series": "6200-series", "type": "deep_groove", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6222-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6222-2RS runs slower and cooler-limited than the open 6222; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6222-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6222-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6222-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6222-RS1 exists for arrangements that lubricate through the open side; fitting 6222-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6222-2RS bearing?", "a": "A 6222-2RS deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4249 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6222 bore code work?", "a": "The last two digits of 6222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6222-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 110 mm bore?", "a": "The '2' is the light diameter series: 200×38 mm with a 45.0 mm radial section at 110 mm bore. A 6322 on the same bore is larger and higher-rated; a 6022 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6222-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6222-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×200×38 mm per ISO 15. Quoted values: C 151 kN, C0 118 kN, Pu 4 kN, limiting speed 2000 r/min, mass 4600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6222-2RS." } ], "cross_ref": [ { "equiv_sku": "6222", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7222", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6222-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6222-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 118, "fatigue_load_limit_kN": 4, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "The open 6300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6300 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6300.", "The open 6300 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6300-2Z (shields) and 6300-2RSH (contact seals), not suffix-free 6300.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300 bearing?", "a": "A 6300 deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6300 mean?", "a": "A bare 6300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300 — the open (unsealed) execution, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 32000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6300", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 55, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6300-2Z.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "ZZ shields are non-contact: 6300-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6300-2RS for that.", "Shielded 6300-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6300-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6300-2Z (one shield: 6300-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6300-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6300-2Z for high-contamination positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-ZZ bearing?", "a": "A 6300-ZZ deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6300-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2Z — two non-contact sheet-metal shields, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 55 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300-ZZ." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2Z", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 54, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6300-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "Contact seals add drag and heat: 6300-2RS runs slower and cooler-limited than the open 6300; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6300-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6300-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 15000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6300-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6300-RSH exists for arrangements that lubricate through the open side; fitting 6300-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-2RS bearing?", "a": "A 6300-2RS deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 50 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6300-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSH — two contact elastomer seals over a lifetime grease fill, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 15000 r/min, mass 54 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6300-2RS." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6300-2RSH", "material": "GCr15", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "The open 6301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6301 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6301 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6301-2Z (shields) and 6301-2RSH (contact seals), not suffix-free 6301.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301 bearing?", "a": "A 6301 deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6301 mean?", "a": "A bare 6301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301 — the open (unsealed) execution, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 28000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6301", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 63, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6301-2Z.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "ZZ shields are non-contact: 6301-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6301-2RS for that.", "Shielded 6301-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6301-2Z (one shield: 6301-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6301-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6301-2Z for high-contamination positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-ZZ bearing?", "a": "A 6301-ZZ deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6301-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2Z — two non-contact sheet-metal shields, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 63 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301-ZZ." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2Z", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 62, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6301-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "Contact seals add drag and heat: 6301-2RS runs slower and cooler-limited than the open 6301; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6301-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6301-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6301-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6301-RSH exists for arrangements that lubricate through the open side; fitting 6301-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-2RS bearing?", "a": "A 6301-2RS deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 59 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6301-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSH — two contact elastomer seals over a lifetime grease fill, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 14000 r/min, mass 62 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6301-2RS." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6301-2RSH", "material": "GCr15", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 82, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "The open 6302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6302 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6302-C3. No clearance suffix means normal CN clearance.", "The open 6302 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6302-2Z (shields) and 6302-2RSH (contact seals), not suffix-free 6302.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302 bearing?", "a": "A 6302 deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6302 mean?", "a": "A bare 6302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302 — the open (unsealed) execution, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 24000 r/min, mass 82 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6302", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 86, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6302-2Z.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "ZZ shields are non-contact: 6302-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.", "Shielded 6302-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6302-2Z (one shield: 6302-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6302-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6302-2Z for high-contamination positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-ZZ bearing?", "a": "A 6302-ZZ deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6302-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2Z — two non-contact sheet-metal shields, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 86 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302-ZZ." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6302-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "Contact seals add drag and heat: 6302-2RS runs slower and cooler-limited than the open 6302; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6302-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6302-2RS.", "SKF catalogues the contact-sealed version as 6302-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6302-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6302-RSH exists for arrangements that lubricate through the open side; fitting 6302-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-2RS bearing?", "a": "A 6302-2RS deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 80 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6302-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSH — two contact elastomer seals over a lifetime grease fill, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 12000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6302-2RS." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6302-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "The open 6303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6303 units.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6303 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6303-2Z (shields) and 6303-2RSH (contact seals), not suffix-free 6303.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303 bearing?", "a": "A 6303 deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6303 mean?", "a": "A bare 6303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303 — the open (unsealed) execution, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 22000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6303", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6303-2Z.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "ZZ shields are non-contact: 6303-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6303-2RS for that.", "Shielded 6303-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6303-2Z (one shield: 6303-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6303-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6303-2Z for high-contamination positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-ZZ bearing?", "a": "A 6303-ZZ deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6303-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2Z — two non-contact sheet-metal shields, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6303-ZZ." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6303-2Z", "material": "GCr15", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "The open 6304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6304 units.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6304 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6304-2Z (shields) and 6304-2RSH (contact seals), not suffix-free 6304.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304 bearing?", "a": "A 6304 deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6304 mean?", "a": "A bare 6304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304 — the open (unsealed) execution, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 19000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6304", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6304-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "ZZ shields are non-contact: 6304-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6304-2RS for that.", "Shielded 6304-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304-ZZ.", "SKF spells the shielded version 6304-2Z (one shield: 6304-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6304-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6304-2Z for high-contamination positions.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-ZZ bearing?", "a": "A 6304-ZZ deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6304-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2Z — two non-contact sheet-metal shields, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304-ZZ." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6304-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "Contact seals add drag and heat: 6304-2RS runs slower and cooler-limited than the open 6304; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6304-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6304-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6304-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed. The single-seal catalogue number is 6304-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6304-RSH exists for arrangements that lubricate through the open side; fitting 6304-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-2RS bearing?", "a": "A 6304-2RS deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 138 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6304-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSH — two contact elastomer seals over a lifetime grease fill, 20×52×15 mm per ISO 15. Quoted values: C 16.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 9500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6304-2RS." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6304-2RSH", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "The open 6305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6305 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6305-2Z (shields) and 6305-2RSH (contact seals), not suffix-free 6305.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305 bearing?", "a": "A 6305 deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6305 mean?", "a": "A bare 6305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305 — the open (unsealed) execution, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 16000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6305", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6305-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "ZZ shields are non-contact: 6305-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6305-2RS for that.", "Shielded 6305-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6305-2Z (one shield: 6305-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6305-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6305-2Z for high-contamination positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-ZZ bearing?", "a": "A 6305-ZZ deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6305-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2Z — two non-contact sheet-metal shields, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305-ZZ." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2Z", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6305-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "Contact seals add drag and heat: 6305-2RS runs slower and cooler-limited than the open 6305; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6305-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6305-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6305-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6305-RSH exists for arrangements that lubricate through the open side; fitting 6305-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-2RS bearing?", "a": "A 6305-2RS deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 219 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6305-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RSH — two contact elastomer seals over a lifetime grease fill, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 7500 r/min, mass 240 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6305-2RS." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6305-2RSH", "material": "GCr15", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "The open 6306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6306 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306.", "The open 6306 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6306-2Z (shields) and 6306-2RSH (contact seals), not suffix-free 6306.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306 bearing?", "a": "A 6306 deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6306 mean?", "a": "A bare 6306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306 — the open (unsealed) execution, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 13000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6306", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6306-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "ZZ shields are non-contact: 6306-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6306-2RS for that.", "Shielded 6306-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6306-2Z (one shield: 6306-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6306-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6306-2Z for high-contamination positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-ZZ bearing?", "a": "A 6306-ZZ deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6306-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2Z — two non-contact sheet-metal shields, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306-ZZ." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6306-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "Contact seals add drag and heat: 6306-2RS runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6306-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6306-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6306-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6306-RSH exists for arrangements that lubricate through the open side; fitting 6306-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-2RS bearing?", "a": "A 6306-2RS deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 326 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6306-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RSH — two contact elastomer seals over a lifetime grease fill, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 6300 r/min, mass 350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6306-2RS." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6306-2RSH", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "The open 6307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6307 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6307-2Z (shields) and 6307-2RSH (contact seals), not suffix-free 6307.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307 bearing?", "a": "A 6307 deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6307 mean?", "a": "A bare 6307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307 — the open (unsealed) execution, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 12000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6307", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 480, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6307-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "ZZ shields are non-contact: 6307-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6307-2RS for that.", "Shielded 6307-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6307-2Z (one shield: 6307-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6307-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6307-2Z for high-contamination positions.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-ZZ bearing?", "a": "A 6307-ZZ deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6307-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2Z — two non-contact sheet-metal shields, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 9500 r/min, mass 480 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307-ZZ." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2Z", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6307-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6307-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.", "Contact seals add drag and heat: 6307-2RS runs slower and cooler-limited than the open 6307; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6307-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6307-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed. The single-seal catalogue number is 6307-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6307-RSH exists for arrangements that lubricate through the open side; fitting 6307-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 35.1/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6307-2RS bearing?", "a": "A 6307-2RS deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 436 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6307 bore code work?", "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6307-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 35 mm bore?", "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6307-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6307-2RSH — two contact elastomer seals over a lifetime grease fill, 35×80×21 mm per ISO 15. Quoted values: C 35.1 kN, C0 19 kN, Pu 0.815 kN, limiting speed 6000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6307-2RS." } ], "cross_ref": [ { "equiv_sku": "6307", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7307", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU307", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6307-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6307-2RSH", "material": "GCr15", "dynamic_load_kN": 35.1, "static_load_kN": 19, "fatigue_load_limit_kN": 0.815, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "The open 6308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-C3. No clearance suffix means normal CN clearance.", "The open 6308 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6308-2Z (shields) and 6308-2RSH (contact seals), not suffix-free 6308.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308 bearing?", "a": "A 6308 deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6308 mean?", "a": "A bare 6308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308 — the open (unsealed) execution, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 11000 r/min, mass 630 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6308", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6308-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "ZZ shields are non-contact: 6308-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6308-2RS for that.", "Shielded 6308-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6308-2Z (one shield: 6308-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6308-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6308-2Z for high-contamination positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-ZZ bearing?", "a": "A 6308-ZZ deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6308-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2Z — two non-contact sheet-metal shields, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308-ZZ." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2Z", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6308-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "Contact seals add drag and heat: 6308-2RS runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6308-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-2RS.", "SKF catalogues the contact-sealed version as 6308-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed. The single-seal catalogue number is 6308-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6308-RSH exists for arrangements that lubricate through the open side; fitting 6308-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-2RS bearing?", "a": "A 6308-2RS deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 599 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6308-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RSH — two contact elastomer seals over a lifetime grease fill, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 5000 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6308-2RS." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6308-2RSH", "material": "GCr15", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 840, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "The open 6309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6309 units.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6309 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6309-2Z (shields) and 6309-2RSH (contact seals), not suffix-free 6309.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309 bearing?", "a": "A 6309 deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6309 mean?", "a": "A bare 6309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309 — the open (unsealed) execution, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 9500 r/min, mass 840 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6309", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6309-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "ZZ shields are non-contact: 6309-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6309-2RS for that.", "Shielded 6309-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6309-2Z (one shield: 6309-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6309-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6309-2Z for high-contamination positions.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-ZZ bearing?", "a": "A 6309-ZZ deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6309-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2Z — two non-contact sheet-metal shields, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 7500 r/min, mass 870 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309-ZZ." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2Z", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6309-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6309-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6309-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.", "Contact seals add drag and heat: 6309-2RS runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6309-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6309-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6309-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6309-RSH exists for arrangements that lubricate through the open side; fitting 6309-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 55.3/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6309-2RS bearing?", "a": "A 6309-2RS deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 799 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6309 bore code work?", "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6309-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 45 mm bore?", "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6309-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6309-2RSH — two contact elastomer seals over a lifetime grease fill, 45×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31.5 kN, Pu 1.34 kN, limiting speed 4500 r/min, mass 850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6309-2RS." } ], "cross_ref": [ { "equiv_sku": "6309", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7309", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU309", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6309-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6309-2RSH", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "The open 6310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6310 units.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6310 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6310-2Z (shields) and 6310-2RSH (contact seals), not suffix-free 6310.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310 bearing?", "a": "A 6310 deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6310 mean?", "a": "A bare 6310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310 — the open (unsealed) execution, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 8500 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6310", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6310-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "ZZ shields are non-contact: 6310-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.", "Shielded 6310-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-ZZ.", "SKF spells the shielded version 6310-2Z (one shield: 6310-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6310-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6310-2Z for high-contamination positions.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-ZZ bearing?", "a": "A 6310-ZZ deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6310-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2Z — two non-contact sheet-metal shields, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 6700 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310-ZZ." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2Z", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6310-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6310-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.", "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "Contact seals add drag and heat: 6310-2RS runs slower and cooler-limited than the open 6310; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6310-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6310-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6310-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6310-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6310-RSH exists for arrangements that lubricate through the open side; fitting 6310-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 65/38 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6310-2RS bearing?", "a": "A 6310-2RS deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1039 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6310 bore code work?", "a": "The last two digits of 6310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6310-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 50 mm bore?", "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6310-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6310-2RSH — two contact elastomer seals over a lifetime grease fill, 50×110×27 mm per ISO 15. Quoted values: C 65 kN, C0 38 kN, Pu 1.6 kN, limiting speed 4300 r/min, mass 1100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6310-2RS." } ], "cross_ref": [ { "equiv_sku": "6310", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU310", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21310", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6310-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6310-2RSH", "material": "GCr15", "dynamic_load_kN": 65, "static_load_kN": 38, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "The open 6311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6311 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6311-2Z (shields) and 6311-2RSH (contact seals), not suffix-free 6311.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311 bearing?", "a": "A 6311 deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6311 mean?", "a": "A bare 6311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311 — the open (unsealed) execution, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8000 r/min, mass 1350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6311", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6311-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "ZZ shields are non-contact: 6311-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6311-2RS for that.", "Shielded 6311-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6311-2Z (one shield: 6311-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6311-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6311-2Z for high-contamination positions.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-ZZ bearing?", "a": "A 6311-ZZ deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6311-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2Z — two non-contact sheet-metal shields, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 6300 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311-ZZ." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2Z", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6311-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6311-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.", "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.", "Contact seals add drag and heat: 6311-2RS runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6311-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6311-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6311-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6311-RSH exists for arrangements that lubricate through the open side; fitting 6311-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 74.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6311-2RS bearing?", "a": "A 6311-2RS deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1322 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6311 bore code work?", "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6311-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 55 mm bore?", "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6311-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6311-2RSH — two contact elastomer seals over a lifetime grease fill, 55×120×29 mm per ISO 15. Quoted values: C 74.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 3800 r/min, mass 1400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6311-2RS." } ], "cross_ref": [ { "equiv_sku": "6311", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU311", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21311", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6311-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6311-2RSH", "material": "GCr15", "dynamic_load_kN": 74.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "The open 6312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6312 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312.", "The open 6312 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6312-2Z (shields) and 6312-2RSH (contact seals), not suffix-free 6312.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312 bearing?", "a": "A 6312 deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6312 mean?", "a": "A bare 6312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312 — the open (unsealed) execution, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7000 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6312", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6312-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "ZZ shields are non-contact: 6312-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6312-2RS for that.", "Shielded 6312-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6312-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6312-2Z (one shield: 6312-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6312-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6312-2Z for high-contamination positions.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-ZZ bearing?", "a": "A 6312-ZZ deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6312-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2Z — two non-contact sheet-metal shields, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 5600 r/min, mass 1800 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312-ZZ." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2Z", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6312-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6312-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.", "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "Contact seals add drag and heat: 6312-2RS runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6312-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6312-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6312-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6312-RSH exists for arrangements that lubricate through the open side; fitting 6312-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6312-2RS bearing?", "a": "A 6312-2RS deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1652 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6312 bore code work?", "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6312-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 60 mm bore?", "a": "The '3' is the medium diameter series: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6312-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6312-2RSH — two contact elastomer seals over a lifetime grease fill, 60×130×31 mm per ISO 15. Quoted values: C 85.2 kN, C0 52 kN, Pu 2.2 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6312-2RS." } ], "cross_ref": [ { "equiv_sku": "6312", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU312", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21312", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6312-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6312-2RSH", "material": "GCr15", "dynamic_load_kN": 85.2, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "The open 6313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6313 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6313-2Z (shields) and 6313-2RSH (contact seals), not suffix-free 6313.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313 bearing?", "a": "A 6313 deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6313 mean?", "a": "A bare 6313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313 — the open (unsealed) execution, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 6700 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6313", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6313-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "ZZ shields are non-contact: 6313-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6313-2RS for that.", "Shielded 6313-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6313-2Z (one shield: 6313-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6313-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6313-2Z for high-contamination positions.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-ZZ bearing?", "a": "A 6313-ZZ deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6313-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2Z — two non-contact sheet-metal shields, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 5300 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313-ZZ." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2Z", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6313-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6313-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.", "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.", "Contact seals add drag and heat: 6313-2RS runs slower and cooler-limited than the open 6313; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6313-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6313-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6313-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6313-RS1 exists for arrangements that lubricate through the open side; fitting 6313-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 97.5/60 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6313-2RS bearing?", "a": "A 6313-2RS deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2033 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6313 bore code work?", "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6313-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 65 mm bore?", "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6313-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6313-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×140×33 mm per ISO 15. Quoted values: C 97.5 kN, C0 60 kN, Pu 2.5 kN, limiting speed 3200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6313-2RS." } ], "cross_ref": [ { "equiv_sku": "6313", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU313", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21313", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6313-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6313-2RS1", "material": "GCr15", "dynamic_load_kN": 97.5, "static_load_kN": 60, "fatigue_load_limit_kN": 2.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "The open 6314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6314 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-C3. No clearance suffix means normal CN clearance.", "The open 6314 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6314-2Z (shields) and 6314-2RSH (contact seals), not suffix-free 6314.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314 bearing?", "a": "A 6314 deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6314 mean?", "a": "A bare 6314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314 — the open (unsealed) execution, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 6300 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6314", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6314-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "ZZ shields are non-contact: 6314-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6314-2RS for that.", "Shielded 6314-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6314-2Z (one shield: 6314-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6314-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6314-2Z for high-contamination positions.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-ZZ bearing?", "a": "A 6314-ZZ deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6314-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2Z — two non-contact sheet-metal shields, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 5000 r/min, mass 2650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314-ZZ." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2Z", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6314-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6314-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.", "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.", "Contact seals add drag and heat: 6314-2RS runs slower and cooler-limited than the open 6314; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6314-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6314-2RS.", "SKF catalogues the contact-sealed version as 6314-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6314-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6314-RS1 exists for arrangements that lubricate through the open side; fitting 6314-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/68 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6314-2RS bearing?", "a": "A 6314-2RS deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2469 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6314 bore code work?", "a": "The last two digits of 6314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6314-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 70 mm bore?", "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6314-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6314-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×150×35 mm per ISO 15. Quoted values: C 111 kN, C0 68 kN, Pu 2.75 kN, limiting speed 3000 r/min, mass 2600 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6314-2RS." } ], "cross_ref": [ { "equiv_sku": "6314", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU314", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21314", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6314-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6314-2RS1", "material": "GCr15", "dynamic_load_kN": 111, "static_load_kN": 68, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "The open 6315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6315 units.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6315 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6315-2Z (shields) and 6315-2RSH (contact seals), not suffix-free 6315.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315 bearing?", "a": "A 6315 deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6315 mean?", "a": "A bare 6315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315 — the open (unsealed) execution, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 5600 r/min, mass 3050 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6315", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6315-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "ZZ shields are non-contact: 6315-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.", "Shielded 6315-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6315-2Z (one shield: 6315-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6315-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6315-2Z for high-contamination positions.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-ZZ bearing?", "a": "A 6315-ZZ deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6315-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2Z — two non-contact sheet-metal shields, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 4500 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315-ZZ." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2Z", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 9000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6315-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6315-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.", "The 63xx medium series gains rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "Contact seals add drag and heat: 6315-2RS runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6315-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6315-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9000 r/min thermal reference speed. The single-seal catalogue number is 6315-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6315-RS1 exists for arrangements that lubricate through the open side; fitting 6315-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 119/76.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6315-2RS bearing?", "a": "A 6315-2RS deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2962 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6315 bore code work?", "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6315-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 75 mm bore?", "a": "The '3' is the medium diameter series: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6315-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6315-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 76.5 kN, Pu 3 kN, limiting speed 2800 r/min, mass 3150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6315-2RS." } ], "cross_ref": [ { "equiv_sku": "6315", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU315", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21315", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6315-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6315-2RS1", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 76.5, "fatigue_load_limit_kN": 3, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "The open 6316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6316 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6316-2Z (shields) and 6316-2RSH (contact seals), not suffix-free 6316.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316 bearing?", "a": "A 6316 deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6316 mean?", "a": "A bare 6316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316 — the open (unsealed) execution, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 5300 r/min, mass 3650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6316", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6316-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "ZZ shields are non-contact: 6316-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6316-2RS for that.", "Shielded 6316-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-ZZ.", "SKF spells the shielded version 6316-2Z (one shield: 6316-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6316-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6316-2Z for high-contamination positions.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-ZZ bearing?", "a": "A 6316-ZZ deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6316-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2Z — two non-contact sheet-metal shields, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 4300 r/min, mass 3750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316-ZZ." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2Z", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6316-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6316-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.", "Contact seals add drag and heat: 6316-2RS runs slower and cooler-limited than the open 6316; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6316-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6316-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6316-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6316-RS1 exists for arrangements that lubricate through the open side; fitting 6316-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 130/86.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6316-2RS bearing?", "a": "A 6316-2RS deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3517 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6316 bore code work?", "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6316-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 80 mm bore?", "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6316-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6316-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×170×39 mm per ISO 15. Quoted values: C 130 kN, C0 86.5 kN, Pu 3.25 kN, limiting speed 2600 r/min, mass 3700 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6316-2RS." } ], "cross_ref": [ { "equiv_sku": "6316", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU316", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21316", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6316-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6316-2RS1", "material": "GCr15", "dynamic_load_kN": 130, "static_load_kN": 86.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "The open 6317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6317 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6317 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6317-2Z (shields) and 6317-2RSH (contact seals), not suffix-free 6317.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317 bearing?", "a": "A 6317 deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6317 mean?", "a": "A bare 6317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317 — the open (unsealed) execution, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 5000 r/min, mass 4250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6317", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6317-2Z.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "ZZ shields are non-contact: 6317-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6317-2RS for that.", "Shielded 6317-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6317-2Z (one shield: 6317-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6317-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6317-2Z for high-contamination positions.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-ZZ bearing?", "a": "A 6317-ZZ deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6317-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2Z — two non-contact sheet-metal shields, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 4000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317-ZZ." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2Z", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6317-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6317-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Contact seals add drag and heat: 6317-2RS runs slower and cooler-limited than the open 6317; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6317-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6317-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6317-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6317-RS1 exists for arrangements that lubricate through the open side; fitting 6317-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 140/96.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6317-2RS bearing?", "a": "A 6317-2RS deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6317 bore code work?", "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6317-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 85 mm bore?", "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6317-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6317-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×180×41 mm per ISO 15. Quoted values: C 140 kN, C0 96.5 kN, Pu 3.55 kN, limiting speed 2400 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6317-2RS." } ], "cross_ref": [ { "equiv_sku": "6317", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU317", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21317", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6317-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6317-2RS1", "material": "GCr15", "dynamic_load_kN": 140, "static_load_kN": 96.5, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "The open 6318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318.", "The open 6318 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6318-2Z (shields) and 6318-2RSH (contact seals), not suffix-free 6318.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318 bearing?", "a": "A 6318 deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6318 mean?", "a": "A bare 6318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318 — the open (unsealed) execution, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 4800 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6318", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6318-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "ZZ shields are non-contact: 6318-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.", "Shielded 6318-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6318-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6318-2Z (one shield: 6318-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6318-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6318-2Z for high-contamination positions.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-ZZ bearing?", "a": "A 6318-ZZ deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6318-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2Z — two non-contact sheet-metal shields, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 3800 r/min, mass 5150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318-ZZ." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2Z", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6318-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6318-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.", "Contact seals add drag and heat: 6318-2RS runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6318-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 43 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6318-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6318-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6318-RS1 exists for arrangements that lubricate through the open side; fitting 6318-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 151/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6318-2RS bearing?", "a": "A 6318-2RS deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4825 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6318 bore code work?", "a": "The last two digits of 6318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6318-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 90 mm bore?", "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6318-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6318-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×190×43 mm per ISO 15. Quoted values: C 151 kN, C0 108 kN, Pu 3.8 kN, limiting speed 2400 r/min, mass 5100 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6318-2RS." } ], "cross_ref": [ { "equiv_sku": "6318", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU318", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21318", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6318-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6318-2RS1", "material": "GCr15", "dynamic_load_kN": 151, "static_load_kN": 108, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 2400, "max_rpm": 2400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "The open 6319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6319 units.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6319 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6319-2Z (shields) and 6319-2RSH (contact seals), not suffix-free 6319.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319 bearing?", "a": "A 6319 deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6319 mean?", "a": "A bare 6319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319 — the open (unsealed) execution, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 4500 r/min, mass 5750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6319", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6319-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "ZZ shields are non-contact: 6319-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6319-2RS for that.", "Shielded 6319-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6319-2Z (one shield: 6319-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6319-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6319-2Z for high-contamination positions.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-ZZ bearing?", "a": "A 6319-ZZ deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6319-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2Z — two non-contact sheet-metal shields, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319-ZZ." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2Z", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6319-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6319-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.", "Contact seals add drag and heat: 6319-2RS runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6319-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6319-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6319-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6319-RS1 exists for arrangements that lubricate through the open side; fitting 6319-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 159/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6319-2RS bearing?", "a": "A 6319-2RS deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 5586 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6319 bore code work?", "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6319-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 95 mm bore?", "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6319-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6319-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×200×45 mm per ISO 15. Quoted values: C 159 kN, C0 118 kN, Pu 4.15 kN, limiting speed 2200 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6319-2RS." } ], "cross_ref": [ { "equiv_sku": "6319", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU319", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21319", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6319-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6319-2RS1", "material": "GCr15", "dynamic_load_kN": 159, "static_load_kN": 118, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 2200, "max_rpm": 2200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6320-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "ZZ shields are non-contact: 6320-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6320-2RS for that.", "Shielded 6320-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6320-2Z (one shield: 6320-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6320-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6320-2Z for high-contamination positions.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-ZZ bearing?", "a": "A 6320-ZZ deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 6823 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6320-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6320-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2Z — two non-contact sheet-metal shields, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 3400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6320-ZZ." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2Z", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6320-2RS", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6320-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.", "Contact seals add drag and heat: 6320-2RS runs slower and cooler-limited than the open 6320; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6320-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6320-2RS.", "SKF catalogues the contact-sealed version as 6320-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6320-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6320-RS1 exists for arrangements that lubricate through the open side; fitting 6320-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 174/140 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6320-2RS bearing?", "a": "A 6320-2RS deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 6823 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6320 bore code work?", "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6320-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 100 mm bore?", "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6320-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6320-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×215×47 mm per ISO 15. Quoted values: C 174 kN, C0 140 kN, Pu 4.75 kN, limiting speed 2000 r/min, mass 7200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6320-2RS." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU320", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21320", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6320-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6320-2RS1", "material": "GCr15", "dynamic_load_kN": 174, "static_load_kN": 140, "fatigue_load_limit_kN": 4.75, "limiting_speed_rpm": 2000, "max_rpm": 2000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "The open 6321 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6321 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6321-2Z (shields) and 6321-2RSH (contact seals), not suffix-free 6321.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321 bearing?", "a": "A 6321 deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 7776 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6321 mean?", "a": "A bare 6321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6321?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321 — the open (unsealed) execution, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 4000 r/min, mass 8200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6321", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6321-ZZ", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6321-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.", "ZZ shields are non-contact: 6321-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6321-2RS for that.", "Shielded 6321-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6321-2Z (one shield: 6321-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6321-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6321-2Z for high-contamination positions.", "The 182/153 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6321-ZZ bearing?", "a": "A 6321-ZZ deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 7776 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6321 bore code work?", "a": "The last two digits of 6321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6321-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 105 mm bore?", "a": "The '3' is the medium diameter series: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 6221 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6321-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6321-2Z — two non-contact sheet-metal shields, 105×225×49 mm per ISO 15. Quoted values: C 182 kN, C0 153 kN, Pu 5.1 kN, limiting speed 3200 r/min, mass 8250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6321-ZZ." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7321", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6321-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6321-2Z", "material": "GCr15", "dynamic_load_kN": 182, "static_load_kN": 153, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6322", "brand": "SKF", "series": "6300-series", "type": "deep_groove", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 9650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier rolling elements also trade away some speed versus a 6222.", "The open 6322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6322 units.", "Shaft and housing fillets must clear the bearing chamfer so the 50 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6322 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6322-2Z (shields) and 6322-2RSH (contact seals), not suffix-free 6322.", "The 203/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6322 bearing?", "a": "A 6322 deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 9117 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6322 bore code work?", "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6322 mean?", "a": "A bare 6322 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 110 mm bore?", "a": "The '3' is the medium diameter series: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 6222 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6322?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6322 — the open (unsealed) execution, 110×240×50 mm per ISO 15. Quoted values: C 203 kN, C0 180 kN, Pu 5.7 kN, limiting speed 3800 r/min, mass 9650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6322." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6322-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7322", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "21322", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6322", "material": "GCr15", "dynamic_load_kN": 203, "static_load_kN": 180, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6004 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "The open 6004 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6004-2Z (shields) and 6004-2RSH (contact seals), not suffix-free 6004.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004 bearing?", "a": "A 6004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6004 mean?", "a": "A bare 6004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004 — the open (unsealed) execution, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 24000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6004", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 71, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6004-2Z.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6004-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.", "Shielded 6004-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6004-2Z (one shield: 6004-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6004-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6004-2Z for high-contamination positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-ZZ bearing?", "a": "A 6004-ZZ deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6004-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2Z — two non-contact sheet-metal shields, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 71 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004-ZZ." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2Z", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6004-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6004-2RS runs slower and cooler-limited than the open 6004; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6004-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6004-2RS.", "SKF catalogues the contact-sealed version as 6004-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed. The single-seal catalogue number is 6004-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6004-RSH exists for arrangements that lubricate through the open side; fitting 6004-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-2RS bearing?", "a": "A 6004-2RS deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 66 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6004-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSH — two contact elastomer seals over a lifetime grease fill, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 11000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6004-2RS." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6004-2RSH", "material": "GCr15", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 78, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6005 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6005 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6005-2Z (shields) and 6005-2RSH (contact seals), not suffix-free 6005.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005 bearing?", "a": "A 6005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6005 mean?", "a": "A bare 6005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005 — the open (unsealed) execution, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 20000 r/min, mass 78 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6005", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6005-2Z.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6005-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6005-2RS for that.", "Shielded 6005-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6005-2Z (one shield: 6005-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6005-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6005-2Z for high-contamination positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-ZZ bearing?", "a": "A 6005-ZZ deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6005-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2Z — two non-contact sheet-metal shields, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005-ZZ." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2Z", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6005-2RSH (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6005-2RS runs slower and cooler-limited than the open 6005; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6005-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6005-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed. The single-seal catalogue number is 6005-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6005-RSH exists for arrangements that lubricate through the open side; fitting 6005-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-2RS bearing?", "a": "A 6005-2RS deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 76 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6005-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSH — two contact elastomer seals over a lifetime grease fill, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 9500 r/min, mass 81 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6005-2RS." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6005-2RSH" ], "locale_variants": {}, "manufacturer_designation": "SKF 6005-2RSH", "material": "GCr15", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6006-2Z.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6006-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6006-2RS for that.", "Shielded 6006-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6006-ZZ.", "SKF spells the shielded version 6006-2Z (one shield: 6006-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6006-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6006-2Z for high-contamination positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-ZZ bearing?", "a": "A 6006-ZZ deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 111 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6006-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2Z — two non-contact sheet-metal shields, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6006-ZZ." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2Z", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6006-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6006-2RS runs slower and cooler-limited than the open 6006; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6006-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6006-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6006-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8000 r/min limiting speed is set by seal-lip drag and grease life. The single-seal catalogue number is 6006-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6006-RS1 exists for arrangements that lubricate through the open side; fitting 6006-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-2RS bearing?", "a": "A 6006-2RS deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 111 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6006-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 8000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6006-2RS." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6006-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6007 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6007 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6007-2Z (shields) and 6007-2RSH (contact seals), not suffix-free 6007.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007 bearing?", "a": "A 6007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6007 mean?", "a": "A bare 6007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007 — the open (unsealed) execution, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6007", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6007-2Z.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6007-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6007-2RS for that.", "Shielded 6007-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6007-2Z (one shield: 6007-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6007-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6007-2Z for high-contamination positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-ZZ bearing?", "a": "A 6007-ZZ deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6007-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2Z — two non-contact sheet-metal shields, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007-ZZ." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2Z", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6007-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6007-2RS runs slower and cooler-limited than the open 6007; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6007-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6007-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed. The single-seal catalogue number is 6007-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6007-RS1 exists for arrangements that lubricate through the open side; fitting 6007-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-2RS bearing?", "a": "A 6007-2RS deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 147 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6007-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 7000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6007-2RS." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6007-2RS1", "material": "GCr15", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6008 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6008.", "The open 6008 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6008-2Z (shields) and 6008-2RSH (contact seals), not suffix-free 6008.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008 bearing?", "a": "A 6008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6008 mean?", "a": "A bare 6008 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008 — the open (unsealed) execution, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 14000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6008", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6008-2Z.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6008-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6008-2RS for that.", "Shielded 6008-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6008-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6008-2Z (one shield: 6008-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6008-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6008-2Z for high-contamination positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-ZZ bearing?", "a": "A 6008-ZZ deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6008-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2Z — two non-contact sheet-metal shields, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008-ZZ." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2Z", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6008-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6008-2RS runs slower and cooler-limited than the open 6008; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6008-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6008-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed. The single-seal catalogue number is 6008-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6008-RS1 exists for arrangements that lubricate through the open side; fitting 6008-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-2RS bearing?", "a": "A 6008-2RS deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 182 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6008-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 6300 r/min, mass 200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6008-2RS." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6008-2RS1", "material": "GCr15", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 240, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6009 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6009 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6009-2Z (shields) and 6009-2RSH (contact seals), not suffix-free 6009.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009 bearing?", "a": "A 6009 deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6009 mean?", "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009 — the open (unsealed) execution, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 12000 r/min, mass 240 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6009", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6009-2Z.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6009-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.", "Shielded 6009-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6009-2Z (one shield: 6009-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6009-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6009-2Z for high-contamination positions.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-ZZ bearing?", "a": "A 6009-ZZ deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6009-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2Z — two non-contact sheet-metal shields, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 10000 r/min, mass 250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009-ZZ." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2Z", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6009-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6009-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6009-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6009-2RS runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6009-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6009-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed. The single-seal catalogue number is 6009-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6009-RS1 exists for arrangements that lubricate through the open side; fitting 6009-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.1/14.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6009-2RS bearing?", "a": "A 6009-2RS deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 231 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6009 bore code work?", "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6009-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 45 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6009-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6009-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×75×16 mm per ISO 15. Quoted values: C 22.1 kN, C0 14.6 kN, Pu 0.64 kN, limiting speed 5600 r/min, mass 250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6009-2RS." } ], "cross_ref": [ { "equiv_sku": "6009", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7009", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6009-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6009-2RS1", "material": "GCr15", "dynamic_load_kN": 22.1, "static_load_kN": 14.6, "fatigue_load_limit_kN": 0.64, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6010 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6010 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-C3. No clearance suffix means normal CN clearance.", "The open 6010 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6010-2Z (shields) and 6010-2RSH (contact seals), not suffix-free 6010.", "The 22.9/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010 bearing?", "a": "A 6010 deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6010 mean?", "a": "A bare 6010 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010 — the open (unsealed) execution, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 16 kN, Pu 0.71 kN, limiting speed 11000 r/min, mass 260 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6010", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 16, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6010-2Z.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6010-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6010-2RS for that.", "Shielded 6010-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6010-2Z (one shield: 6010-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6010-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6010-2Z for high-contamination positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-ZZ bearing?", "a": "A 6010-ZZ deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6010-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2Z — two non-contact sheet-metal shields, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010-ZZ." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2Z", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6010-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6010-2RS runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6010-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6010-2RS.", "SKF catalogues the contact-sealed version as 6010-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 18000 r/min thermal reference speed. The single-seal catalogue number is 6010-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6010-RS1 exists for arrangements that lubricate through the open side; fitting 6010-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-2RS bearing?", "a": "A 6010-2RS deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 250 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6010-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 5000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6010-2RS." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6010-2RS1", "material": "GCr15", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6011 units.", "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6011 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6011-2Z (shields) and 6011-2RSH (contact seals), not suffix-free 6011.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011 bearing?", "a": "A 6011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6011 mean?", "a": "A bare 6011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011 — the open (unsealed) execution, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 10000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6011", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6011-2Z.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6011-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6011-2RS for that.", "Shielded 6011-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6011-2Z (one shield: 6011-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6011-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6011-2Z for high-contamination positions.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-ZZ bearing?", "a": "A 6011-ZZ deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6011-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2Z — two non-contact sheet-metal shields, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 8000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011-ZZ." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2Z", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6011-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6011-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6011 with C3 for those conditions.", "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6011-2RS runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6011-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6011-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed. The single-seal catalogue number is 6011-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6011-RS1 exists for arrangements that lubricate through the open side; fitting 6011-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 29.6/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6011-2RS bearing?", "a": "A 6011-2RS deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 366 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6011 bore code work?", "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6011-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 55 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6011-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6011-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×90×18 mm per ISO 15. Quoted values: C 29.6 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4500 r/min, mass 400 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6011-2RS." } ], "cross_ref": [ { "equiv_sku": "6011", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7011", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6011-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6011-2RS1", "material": "GCr15", "dynamic_load_kN": 29.6, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6012 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×95×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6012 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6012 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6012-2Z (shields) and 6012-2RSH (contact seals), not suffix-free 6012.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012 bearing?", "a": "A 6012 deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6012 mean?", "a": "A bare 6012 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012 — the open (unsealed) execution, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 9500 r/min, mass 410 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6012", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6012-2Z.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6012-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.", "Shielded 6012-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 95 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6012-ZZ.", "SKF spells the shielded version 6012-2Z (one shield: 6012-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6012-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6012-2Z for high-contamination positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-ZZ bearing?", "a": "A 6012-ZZ deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6012-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2Z — two non-contact sheet-metal shields, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012-ZZ." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2Z", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6012-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6012-2RS runs slower and cooler-limited than the open 6012; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6012-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6012-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6012-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed. The single-seal catalogue number is 6012-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6012-RS1 exists for arrangements that lubricate through the open side; fitting 6012-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-2RS bearing?", "a": "A 6012-2RS deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 391 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6012-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 4300 r/min, mass 430 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6012-2RS." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6012-2RS1", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "limiting_speed_rpm": 4300, "max_rpm": 4300, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 440, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6013 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6013 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6013 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6013-2Z (shields) and 6013-2RSH (contact seals), not suffix-free 6013.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013 bearing?", "a": "A 6013 deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6013 mean?", "a": "A bare 6013 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013 — the open (unsealed) execution, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 9000 r/min, mass 440 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6013", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 460, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6013-2Z.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6013-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.", "Shielded 6013-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6013-2Z (one shield: 6013-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6013-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6013-2Z for high-contamination positions.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-ZZ bearing?", "a": "A 6013-ZZ deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6013-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2Z — two non-contact sheet-metal shields, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 7000 r/min, mass 460 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013-ZZ." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2Z", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6013-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6013-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.", "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6013-2RS runs slower and cooler-limited than the open 6013; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6013-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6013-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed. The single-seal catalogue number is 6013-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6013-RS1 exists for arrangements that lubricate through the open side; fitting 6013-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 31.9/25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6013-2RS bearing?", "a": "A 6013-2RS deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 417 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6013 bore code work?", "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6013-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 65 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6013-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6013-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×100×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 25 kN, Pu 1.06 kN, limiting speed 4000 r/min, mass 450 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6013-2RS." } ], "cross_ref": [ { "equiv_sku": "6013", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7013", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6013-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6013-2RS1", "material": "GCr15", "dynamic_load_kN": 31.9, "static_load_kN": 25, "fatigue_load_limit_kN": 1.06, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6014 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×110×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6014.", "The open 6014 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6014-2Z (shields) and 6014-2RSH (contact seals), not suffix-free 6014.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014 bearing?", "a": "A 6014 deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6014 mean?", "a": "A bare 6014 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014 — the open (unsealed) execution, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 8000 r/min, mass 610 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6014", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 640, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6014-2Z.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6014-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6014-2RS for that.", "Shielded 6014-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6014-2Z (one shield: 6014-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6014-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6014-2Z for high-contamination positions.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-ZZ bearing?", "a": "A 6014-ZZ deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6014-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2Z — two non-contact sheet-metal shields, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 6300 r/min, mass 640 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014-ZZ." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2Z", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6014-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 630, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6014-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.", "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6014-2RS runs slower and cooler-limited than the open 6014; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6014-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6014-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed. The single-seal catalogue number is 6014-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6014-RS1 exists for arrangements that lubricate through the open side; fitting 6014-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 39.7/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6014-2RS bearing?", "a": "A 6014-2RS deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 577 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6014 bore code work?", "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6014-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 70 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (110×20 mm, 20.0 mm radial section) at 70 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6014-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6014-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×110×20 mm per ISO 15. Quoted values: C 39.7 kN, C0 31 kN, Pu 1.32 kN, limiting speed 3600 r/min, mass 630 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6014-2RS." } ], "cross_ref": [ { "equiv_sku": "6014", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7014", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6014-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6014-2RS1", "material": "GCr15", "dynamic_load_kN": 39.7, "static_load_kN": 31, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 3600, "max_rpm": 3600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6015 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6015 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6015 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6015-2Z (shields) and 6015-2RSH (contact seals), not suffix-free 6015.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015 bearing?", "a": "A 6015 deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6015 mean?", "a": "A bare 6015 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015 — the open (unsealed) execution, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 7500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6015", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 680, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6015-2Z.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6015-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6015-2RS for that.", "Shielded 6015-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6015-2Z (one shield: 6015-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6015-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6015-2Z for high-contamination positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-ZZ bearing?", "a": "A 6015-ZZ deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6015-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2Z — two non-contact sheet-metal shields, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 680 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015-ZZ." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2Z", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6015-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6015-2RS runs slower and cooler-limited than the open 6015; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6015-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6015-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed. The single-seal catalogue number is 6015-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6015-RS1 exists for arrangements that lubricate through the open side; fitting 6015-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-2RS bearing?", "a": "A 6015-2RS deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 609 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6015-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 3400 r/min, mass 670 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6015-2RS." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6015-2RS1", "material": "GCr15", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "limiting_speed_rpm": 3400, "max_rpm": 3400, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 860, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6016 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×125×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6016-C3. No clearance suffix means normal CN clearance.", "The open 6016 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6016-2Z (shields) and 6016-2RSH (contact seals), not suffix-free 6016.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016 bearing?", "a": "A 6016 deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6016 mean?", "a": "A bare 6016 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016 — the open (unsealed) execution, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 7000 r/min, mass 860 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6016", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 890, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6016-2Z.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6016-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.", "Shielded 6016-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6016-2Z (one shield: 6016-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6016-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6016-2Z for high-contamination positions.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-ZZ bearing?", "a": "A 6016-ZZ deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6016-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2Z — two non-contact sheet-metal shields, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 890 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016-ZZ." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2Z", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6016-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 880, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6016-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6016-2RS runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6016-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6016-2RS.", "SKF catalogues the contact-sealed version as 6016-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6016-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6016-RS1 exists for arrangements that lubricate through the open side; fitting 6016-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 49.4/40 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6016-2RS bearing?", "a": "A 6016-2RS deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 813 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6016 bore code work?", "a": "The last two digits of 6016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6016-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 80 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6016-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6016-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×125×22 mm per ISO 15. Quoted values: C 49.4 kN, C0 40 kN, Pu 1.66 kN, limiting speed 3200 r/min, mass 880 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6016-2RS." } ], "cross_ref": [ { "equiv_sku": "6016", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7016", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6016-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6016-2RS1", "material": "GCr15", "dynamic_load_kN": 49.4, "static_load_kN": 40, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 3200, "max_rpm": 3200, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6017 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6017 units.", "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6017 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6017-2Z (shields) and 6017-2RSH (contact seals), not suffix-free 6017.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017 bearing?", "a": "A 6017 deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6017 mean?", "a": "A bare 6017 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017 — the open (unsealed) execution, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 6700 r/min, mass 900 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6017", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 940, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6017-2Z.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6017-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6017-2RS for that.", "Shielded 6017-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 6017-2Z (one shield: 6017-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6017-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6017-2Z for high-contamination positions.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-ZZ bearing?", "a": "A 6017-ZZ deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6017-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2Z — two non-contact sheet-metal shields, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 5300 r/min, mass 940 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017-ZZ." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2Z", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6017-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6017-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6017-2RS runs slower and cooler-limited than the open 6017; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6017-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 6017-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed. The single-seal catalogue number is 6017-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6017-RS1 exists for arrangements that lubricate through the open side; fitting 6017-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 52/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6017-2RS bearing?", "a": "A 6017-2RS deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 853 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6017 bore code work?", "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6017-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 85 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (130×22 mm, 22.5 mm radial section) at 85 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6017-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6017-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×130×22 mm per ISO 15. Quoted values: C 52 kN, C0 43 kN, Pu 1.76 kN, limiting speed 3000 r/min, mass 930 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6017-2RS." } ], "cross_ref": [ { "equiv_sku": "6017", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7017", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6017-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6017-2RS1", "material": "GCr15", "dynamic_load_kN": 52, "static_load_kN": 43, "fatigue_load_limit_kN": 1.76, "limiting_speed_rpm": 3000, "max_rpm": 3000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6018 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6018 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6018 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6018-2Z (shields) and 6018-2RSH (contact seals), not suffix-free 6018.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018 bearing?", "a": "A 6018 deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6018 mean?", "a": "A bare 6018 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018 — the open (unsealed) execution, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 6300 r/min, mass 1150 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6018", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6018-2Z.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6018-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6018-2RS for that.", "Shielded 6018-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6018-ZZ.", "SKF spells the shielded version 6018-2Z (one shield: 6018-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6018-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6018-2Z for high-contamination positions.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-ZZ bearing?", "a": "A 6018-ZZ deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6018-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2Z — two non-contact sheet-metal shields, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018-ZZ." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2Z", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6018-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6018-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6018-2RS runs slower and cooler-limited than the open 6018; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6018-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6018-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6018-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed. The single-seal catalogue number is 6018-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6018-RS1 exists for arrangements that lubricate through the open side; fitting 6018-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 60.5/50 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6018-2RS bearing?", "a": "A 6018-2RS deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1106 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6018 bore code work?", "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6018-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 90 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6018-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6018-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×140×24 mm per ISO 15. Quoted values: C 60.5 kN, C0 50 kN, Pu 1.96 kN, limiting speed 2800 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6018-2RS." } ], "cross_ref": [ { "equiv_sku": "6018", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7018", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6018-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6018-2RS1", "material": "GCr15", "dynamic_load_kN": 60.5, "static_load_kN": 50, "fatigue_load_limit_kN": 1.96, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6019 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6019 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6019 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6019-2Z (shields) and 6019-2RSH (contact seals), not suffix-free 6019.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019 bearing?", "a": "A 6019 deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6019 mean?", "a": "A bare 6019 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019 — the open (unsealed) execution, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 6000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6019", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6019-2Z.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6019-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6019-2RS for that.", "Shielded 6019-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6019-2Z (one shield: 6019-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6019-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6019-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-ZZ bearing?", "a": "A 6019-ZZ deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6019-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2Z — two non-contact sheet-metal shields, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 4800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019-ZZ." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6019-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6019-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6019-2RS runs slower and cooler-limited than the open 6019; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6019-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6019-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6019-2RS bearing?", "a": "A 6019-2RS deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1154 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6019 bore code work?", "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6019-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 95 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (145×24 mm, 25.0 mm radial section) at 95 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6019-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6019-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×145×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.08 kN, limiting speed 2800 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6019-2RS." } ], "cross_ref": [ { "equiv_sku": "6019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7019", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6019-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6019-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2800, "max_rpm": 2800, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6020 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×150×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6020 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6020.", "The open 6020 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6020-2Z (shields) and 6020-2RSH (contact seals), not suffix-free 6020.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020 bearing?", "a": "A 6020 deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6020 mean?", "a": "A bare 6020 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020 — the open (unsealed) execution, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 5600 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6020", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-ZZ", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6020-2Z.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6020-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6020-2RS for that.", "Shielded 6020-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-ZZ-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6020-2Z (one shield: 6020-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6020-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6020-2Z for high-contamination positions.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-ZZ bearing?", "a": "A 6020-ZZ deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6020-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2Z — two non-contact sheet-metal shields, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 4500 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020-ZZ." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2Z" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2Z", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6020-2RS", "brand": "SKF", "series": "6000-series", "type": "deep_groove", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 6020-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 100 mm bore uses a smaller 150 mm OD than a 6220; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6020-2RS runs slower and cooler-limited than the open 6020; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6020-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6020-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed. The single-seal catalogue number is 6020-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6020-RS1 exists for arrangements that lubricate through the open side; fitting 6020-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 63.7/54 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6020-2RS bearing?", "a": "A 6020-2RS deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1202 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6020 bore code work?", "a": "The last two digits of 6020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6020-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 100 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6020-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6020-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×150×24 mm per ISO 15. Quoted values: C 63.7 kN, C0 54 kN, Pu 2.04 kN, limiting speed 2600 r/min, mass 1300 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6020-2RS." } ], "cross_ref": [ { "equiv_sku": "6020", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7020", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6020-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 6020-2RS1", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 54, "fatigue_load_limit_kN": 2.04, "limiting_speed_rpm": 2600, "max_rpm": 2600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6404", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 410, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6404 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6404 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6404 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6404-2Z (shields) and 6404-2RSH (contact seals), not suffix-free 6404.", "The 30.7/15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6404 bearing?", "a": "A 6404 deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 364 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6404 bore code work?", "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6404 mean?", "a": "A bare 6404 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 20 mm bore?", "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6404?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6404 — the open (unsealed) execution, 20×72×19 mm per ISO 15. Quoted values: C 30.7 kN, C0 15 kN, Pu 0.64 kN, limiting speed 15000 r/min, mass 410 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6404." } ], "cross_ref": [ { "equiv_sku": "6404-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6404-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7404", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6404", "material": "GCr15", "dynamic_load_kN": 30.7, "static_load_kN": 15, "fatigue_load_limit_kN": 0.64, "reference_speed_rpm": 24000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6405", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 540, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6405 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6405 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6405.", "The open 6405 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6405-2Z (shields) and 6405-2RSH (contact seals), not suffix-free 6405.", "The 35.8/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6405 bearing?", "a": "A 6405 deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 486 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6405 bore code work?", "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6405 mean?", "a": "A bare 6405 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 25 mm bore?", "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6405?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6405 — the open (unsealed) execution, 25×80×21 mm per ISO 15. Quoted values: C 35.8 kN, C0 19.3 kN, Pu 0.815 kN, limiting speed 13000 r/min, mass 540 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6405." } ], "cross_ref": [ { "equiv_sku": "6405-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6405-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7405", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6405", "material": "GCr15", "dynamic_load_kN": 35.8, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.815, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6406", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6406 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6406 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6406 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6406-2Z (shields) and 6406-2RSH (contact seals), not suffix-free 6406.", "The 43.6/23.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6406 bearing?", "a": "A 6406 deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 664 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6406 bore code work?", "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6406 mean?", "a": "A bare 6406 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 30 mm bore?", "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6406?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6406 — the open (unsealed) execution, 30×90×23 mm per ISO 15. Quoted values: C 43.6 kN, C0 23.6 kN, Pu 1 kN, limiting speed 11000 r/min, mass 750 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6406." } ], "cross_ref": [ { "equiv_sku": "6406-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6406-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7406", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6406", "material": "GCr15", "dynamic_load_kN": 43.6, "static_load_kN": 23.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 18000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6407", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 970, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6407 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6407 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6407-C3. No clearance suffix means normal CN clearance.", "The open 6407 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6407-2Z (shields) and 6407-2RSH (contact seals), not suffix-free 6407.", "The 55.3/31 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6407 bearing?", "a": "A 6407 deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 879 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6407 bore code work?", "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6407 mean?", "a": "A bare 6407 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 35 mm bore?", "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6407?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6407 — the open (unsealed) execution, 35×100×25 mm per ISO 15. Quoted values: C 55.3 kN, C0 31 kN, Pu 1.29 kN, limiting speed 10000 r/min, mass 970 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6407." } ], "cross_ref": [ { "equiv_sku": "6407-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6407-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7407", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6407", "material": "GCr15", "dynamic_load_kN": 55.3, "static_load_kN": 31, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6408", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6408 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6408 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6408-2Z (shields) and 6408-2RSH (contact seals), not suffix-free 6408.", "The 63.7/36.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6408 bearing?", "a": "A 6408 deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6408 bore code work?", "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6408 mean?", "a": "A bare 6408 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 40 mm bore?", "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6408?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6408 — the open (unsealed) execution, 40×110×27 mm per ISO 15. Quoted values: C 63.7 kN, C0 36.5 kN, Pu 1.53 kN, limiting speed 9000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6408." } ], "cross_ref": [ { "equiv_sku": "6408-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6408-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7408", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6408", "material": "GCr15", "dynamic_load_kN": 63.7, "static_load_kN": 36.5, "fatigue_load_limit_kN": 1.53, "reference_speed_rpm": 14000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6409", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6409 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6409 units.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6409 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6409-2Z (shields) and 6409-2RSH (contact seals), not suffix-free 6409.", "The 76.1/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6409 bearing?", "a": "A 6409 deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1438 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6409 bore code work?", "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6409 mean?", "a": "A bare 6409 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 45 mm bore?", "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6409?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6409 — the open (unsealed) execution, 45×120×29 mm per ISO 15. Quoted values: C 76.1 kN, C0 45 kN, Pu 1.9 kN, limiting speed 8500 r/min, mass 1550 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6409." } ], "cross_ref": [ { "equiv_sku": "6409-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6409-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7409", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6409", "material": "GCr15", "dynamic_load_kN": 76.1, "static_load_kN": 45, "fatigue_load_limit_kN": 1.9, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6410", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.", "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6410 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6410 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6410 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6410-2Z (shields) and 6410-2RSH (contact seals), not suffix-free 6410.", "The 87.1/52 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6410 bearing?", "a": "A 6410 deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 1789 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6410 bore code work?", "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6410 mean?", "a": "A bare 6410 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 50 mm bore?", "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6410?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6410 — the open (unsealed) execution, 50×130×31 mm per ISO 15. Quoted values: C 87.1 kN, C0 52 kN, Pu 2.2 kN, limiting speed 7500 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6410." } ], "cross_ref": [ { "equiv_sku": "6410-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6410-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7410", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6410", "material": "GCr15", "dynamic_load_kN": 87.1, "static_load_kN": 52, "fatigue_load_limit_kN": 2.2, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6411", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.", "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6411 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6411 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6411.", "The open 6411 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6411-2Z (shields) and 6411-2RSH (contact seals), not suffix-free 6411.", "The 99.5/62 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6411 bearing?", "a": "A 6411 deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2192 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6411 bore code work?", "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6411 mean?", "a": "A bare 6411 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 55 mm bore?", "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6411?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6411 — the open (unsealed) execution, 55×140×33 mm per ISO 15. Quoted values: C 99.5 kN, C0 62 kN, Pu 2.6 kN, limiting speed 7000 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6411." } ], "cross_ref": [ { "equiv_sku": "6411-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6411-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7411", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6411", "material": "GCr15", "dynamic_load_kN": 99.5, "static_load_kN": 62, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6412", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.", "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6412 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6412 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6412 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6412-2Z (shields) and 6412-2RSH (contact seals), not suffix-free 6412.", "The 108/69.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6412 bearing?", "a": "A 6412 deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 2651 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6412 bore code work?", "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6412 mean?", "a": "A bare 6412 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 60 mm bore?", "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6412?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6412 — the open (unsealed) execution, 60×150×35 mm per ISO 15. Quoted values: C 108 kN, C0 69.5 kN, Pu 2.9 kN, limiting speed 6300 r/min, mass 2850 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6412." } ], "cross_ref": [ { "equiv_sku": "6412-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6412-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7412", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6412", "material": "GCr15", "dynamic_load_kN": 108, "static_load_kN": 69.5, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6413", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives", "material-handling equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.", "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6413 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6413 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6413-C3. No clearance suffix means normal CN clearance.", "The open 6413 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6413-2Z (shields) and 6413-2RSH (contact seals), not suffix-free 6413.", "The 119/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6413 bearing?", "a": "A 6413 deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6413 bore code work?", "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6413 mean?", "a": "A bare 6413 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 65 mm bore?", "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6413?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6413 — the open (unsealed) execution, 65×160×37 mm per ISO 15. Quoted values: C 119 kN, C0 78 kN, Pu 3.15 kN, limiting speed 6000 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6413." } ], "cross_ref": [ { "equiv_sku": "6413-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6413-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7413", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6413", "material": "GCr15", "dynamic_load_kN": 119, "static_load_kN": 78, "fatigue_load_limit_kN": 3.15, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6414", "brand": "SKF", "series": "6400-series", "type": "deep_groove", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.", "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6414 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×180×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6414 units.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6414 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6414-2Z (shields) and 6414-2RSH (contact seals), not suffix-free 6414.", "The 143/104 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6414 bearing?", "a": "A 6414 deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 6414 bore code work?", "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6414 mean?", "a": "A bare 6414 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 70 mm bore?", "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6414?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6414 — the open (unsealed) execution, 70×180×42 mm per ISO 15. Quoted values: C 143 kN, C0 104 kN, Pu 3.9 kN, limiting speed 5300 r/min, mass 4950 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 6414." } ], "cross_ref": [ { "equiv_sku": "6414-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6414-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7414", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 6414", "material": "GCr15", "dynamic_load_kN": 143, "static_load_kN": 104, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61904 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×37×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61904 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61904 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61904-2Z (shields) and 61904-2RSH (contact seals), not suffix-free 61904.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904 bearing?", "a": "A 61904 deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61904 mean?", "a": "A bare 61904 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904 — the open (unsealed) execution, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 26000 r/min, mass 37 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61904." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61904", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61904-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61904-2RS runs slower and cooler-limited than the open 61904; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61904-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61904-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 12000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 43000 r/min thermal reference speed.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-2RS bearing?", "a": "A 61904-2RS deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 35 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61904-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 12000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61904-2RS." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61904-2RS1", "material": "GCr15", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61905 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×42×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61905 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "The open 61905 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61905-2Z (shields) and 61905-2RSH (contact seals), not suffix-free 61905.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905 bearing?", "a": "A 61905 deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 41 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61905 mean?", "a": "A bare 61905 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905 — the open (unsealed) execution, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 22000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61905." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61905", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61905-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61905-2RS runs slower and cooler-limited than the open 61905; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61905-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905-2RS.", "SKF catalogues the contact-sealed version as 61905-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 10000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 36000 r/min thermal reference speed.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-2RS bearing?", "a": "A 61905-2RS deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 41 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61905-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 10000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61905-2RS." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61905-2RS1", "material": "GCr15", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "limiting_speed_rpm": 10000, "max_rpm": 10000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 49, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61906 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61906 units.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61906 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61906-2Z (shields) and 61906-2RSH (contact seals), not suffix-free 61906.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906 bearing?", "a": "A 61906 deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 47 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61906 mean?", "a": "A bare 61906 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906 — the open (unsealed) execution, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 49 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61906." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61906", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61906-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61906-2RS runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61906-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61906-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-2RS bearing?", "a": "A 61906-2RS deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 47 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61906-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 8500 r/min, mass 51 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61906-2RS." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61906-2RS1", "material": "GCr15", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "limiting_speed_rpm": 8500, "max_rpm": 8500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61907 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61907 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61907 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61907-2Z (shields) and 61907-2RSH (contact seals), not suffix-free 61907.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907 bearing?", "a": "A 61907 deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61907 mean?", "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907 — the open (unsealed) execution, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61907." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61907", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61907-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61907-2RS runs slower and cooler-limited than the open 61907; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61907-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61907-2RS-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61907-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-2RS bearing?", "a": "A 61907-2RS deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61907-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 7500 r/min, mass 80 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61907-2RS." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61907-2RS1", "material": "GCr15", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "limiting_speed_rpm": 7500, "max_rpm": 7500, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61908 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61908 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61908 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61908-2Z (shields) and 61908-2RSH (contact seals), not suffix-free 61908.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908 bearing?", "a": "A 61908 deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61908 mean?", "a": "A bare 61908 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908 — the open (unsealed) execution, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61908." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61908", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61908-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61908-2RS runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61908-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61908-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 24000 r/min thermal reference speed.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-2RS bearing?", "a": "A 61908-2RS deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 108 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61908-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 6700 r/min, mass 120 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61908-2RS." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61908-2RS1", "material": "GCr15", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "limiting_speed_rpm": 6700, "max_rpm": 6700, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61909 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61909 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909.", "The open 61909 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61909-2Z (shields) and 61909-2RSH (contact seals), not suffix-free 61909.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909 bearing?", "a": "A 61909 deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61909 mean?", "a": "A bare 61909 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909 — the open (unsealed) execution, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 13000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61909." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61909", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61909-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61909-2RS runs slower and cooler-limited than the open 61909; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61909-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61909-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-2RS bearing?", "a": "A 61909-2RS deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 125 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61909-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 6000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61909-2RS." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61909-2RS1", "material": "GCr15", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "limiting_speed_rpm": 6000, "max_rpm": 6000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61910 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×72×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61910 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61910 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61910-2Z (shields) and 61910-2RSH (contact seals), not suffix-free 61910.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910 bearing?", "a": "A 61910 deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 129 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61910 mean?", "a": "A bare 61910 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910 — the open (unsealed) execution, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 12000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61910." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61910", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61910-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61910-2RS runs slower and cooler-limited than the open 61910; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61910-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61910-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-2RS bearing?", "a": "A 61910-2RS deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 129 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61910-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 5600 r/min, mass 140 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61910-2RS." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61910-2RS1", "material": "GCr15", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61911 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61911 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "The open 61911 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61911-2Z (shields) and 61911-2RSH (contact seals), not suffix-free 61911.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911 bearing?", "a": "A 61911 deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 176 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61911 mean?", "a": "A bare 61911 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911 — the open (unsealed) execution, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 11000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61911." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61911", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-2RS", "brand": "SKF", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61911-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61911-2RS runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61911-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61911-2RS.", "SKF catalogues the contact-sealed version as 61911-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-2RS bearing?", "a": "A 61911-2RS deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 176 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61911-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 5000 r/min, mass 190 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61911-2RS." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61911-2RS1", "material": "GCr15", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 5000, "max_rpm": 5000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "The open 61804 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×32×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61804 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804.", "The open 61804 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61804-2Z (shields) and 61804-2RSH (contact seals), not suffix-free 61804.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804 bearing?", "a": "A 61804 deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 18 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61804 mean?", "a": "A bare 61804 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804 — the open (unsealed) execution, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 28000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61804." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "manufacturer_designation": "SKF 61804", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-2RS", "brand": "SKF", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's contact-seal catalogue number is 61804-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "Contact seals add drag and heat: 61804-2RS runs slower and cooler-limited than the open 61804; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61804-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61804-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-2RS bearing?", "a": "A 61804-2RS deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 18 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61804-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RS1 — two contact elastomer seals over a lifetime grease fill, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 13000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH) differ from the industry-neutral spelling 61804-2RS." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RS1" ], "locale_variants": {}, "manufacturer_designation": "SKF 61804-2RS1", "material": "GCr15", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "limiting_speed_rpm": 13000, "max_rpm": 13000, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000", "brand": "SKF", "manufacturer_designation": "SKF 6000", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6000 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×26×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6000 units.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6000 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6000-2Z (shields) and 6000-2RSH (contact seals), not suffix-free 6000.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000 bearing?", "a": "A 6000 deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6000 mean?", "a": "A bare 6000 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000 — the open (unsealed) execution, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 40000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6000-2RS runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6000-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6000-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6000-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed. The single-seal catalogue number is 6000-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6000-RSH exists for arrangements that lubricate through the open side; fitting 6000-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-2RS bearing?", "a": "A 6000-2RS deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6000-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSH — two contact elastomer seals over a lifetime grease fill, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 19000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-2RS." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6000-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6000-RSR run faster than contact-seal 6000-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6000-2RS instead.", "The non-contact lip of 6000-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6000-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 34000 r/min limiting speed, closer to the open bearing's 67000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-RSR bearing?", "a": "A 6000-RSR deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6000-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2RSL — two low-friction non-contact elastomer seals, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 19 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-RSR." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6000-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6000-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.75, "static_load_kN": 1.96, "fatigue_load_limit_kN": 0.083, "reference_speed_rpm": 67000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6200; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6000-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6000-2RS for that.", "Shielded 6000-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6000-ZZ.", "SKF spells the shielded version 6000-2Z (one shield: 6000-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6000-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6000-2Z for high-contamination positions.", "The 4.75/1.96 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6000-ZZ bearing?", "a": "A 6000-ZZ deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6000-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 10 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (26×8 mm, 8.0 mm radial section) at 10 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6000-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6000-2Z — two non-contact sheet-metal shields, 10×26×8 mm per ISO 15. Quoted values: C 4.75 kN, C0 1.96 kN, Pu 0.083 kN, limiting speed 34000 r/min, mass 20 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6000-ZZ." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7000", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6000-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001", "brand": "SKF", "manufacturer_designation": "SKF 6001", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6001 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6001 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6001-2Z (shields) and 6001-2RSH (contact seals), not suffix-free 6001.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001 bearing?", "a": "A 6001 deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6001 mean?", "a": "A bare 6001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001 — the open (unsealed) execution, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 38000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6001-2RS runs slower and cooler-limited than the open 6001; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6001-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6001-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed. The single-seal catalogue number is 6001-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6001-RSH exists for arrangements that lubricate through the open side; fitting 6001-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-2RS bearing?", "a": "A 6001-2RS deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6001-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSH — two contact elastomer seals over a lifetime grease fill, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 17000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-2RS." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6001-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6001-RSR run faster than contact-seal 6001-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6001-2RS instead.", "The non-contact lip of 6001-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6001-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 30000 r/min limiting speed, closer to the open bearing's 60000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-RSR bearing?", "a": "A 6001-RSR deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6001-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2RSL — two low-friction non-contact elastomer seals, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 21 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-RSR." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6001-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6001-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6201; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6001-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.", "Shielded 6001-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6001-2Z (one shield: 6001-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6001-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6001-2Z for high-contamination positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6001-ZZ bearing?", "a": "A 6001-ZZ deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6001-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 12 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6001-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6001-2Z — two non-contact sheet-metal shields, 12×28×8 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 30000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6001-ZZ." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7001", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6001-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002", "brand": "SKF", "manufacturer_designation": "SKF 6002", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6002 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002.", "The open 6002 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6002-2Z (shields) and 6002-2RSH (contact seals), not suffix-free 6002.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002 bearing?", "a": "A 6002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6002 mean?", "a": "A bare 6002 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002 — the open (unsealed) execution, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 32000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6002-2RS runs slower and cooler-limited than the open 6002; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6002-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6002-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed. The single-seal catalogue number is 6002-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6002-RSH exists for arrangements that lubricate through the open side; fitting 6002-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-2RS bearing?", "a": "A 6002-2RS deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6002-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSH — two contact elastomer seals over a lifetime grease fill, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 14000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-2RS." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6002-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6002-RSR run faster than contact-seal 6002-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6002-2RS instead.", "The non-contact lip of 6002-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002-RSR.", "SKF catalogues the low-friction seal as 6002-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-RSR bearing?", "a": "A 6002-RSR deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6002-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2RSL — two low-friction non-contact elastomer seals, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-RSR." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6002-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6002-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.85, "static_load_kN": 2.85, "fatigue_load_limit_kN": 0.12, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6202; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6002-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6002-2RS for that.", "Shielded 6002-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6002-2Z (one shield: 6002-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6002-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6002-2Z for high-contamination positions.", "The 5.85/2.85 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6002-ZZ bearing?", "a": "A 6002-ZZ deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6002-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6002-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6002-2Z — two non-contact sheet-metal shields, 15×32×9 mm per ISO 15. Quoted values: C 5.85 kN, C0 2.85 kN, Pu 0.12 kN, limiting speed 26000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6002-ZZ." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7002", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6002-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003", "brand": "SKF", "manufacturer_designation": "SKF 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6003 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×35×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6003 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6003-2Z (shields) and 6003-2RSH (contact seals), not suffix-free 6003.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003 bearing?", "a": "A 6003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6003 mean?", "a": "A bare 6003 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003 — the open (unsealed) execution, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 28000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSH", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6003-2RS runs slower and cooler-limited than the open 6003; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6003-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6003-2RSH (older printings may read -2RS1); it is shipped pre-greased and its 13000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 45000 r/min thermal reference speed. The single-seal catalogue number is 6003-RSH, used where one shaft side needs external relubrication.", "A one-seal execution 6003-RSH exists for arrangements that lubricate through the open side; fitting 6003-2RSH instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-2RS bearing?", "a": "A 6003-2RS deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 6003-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSH — two contact elastomer seals over a lifetime grease fill, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 13000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-2RS." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSH" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6003-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 39, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6003-RSR run faster than contact-seal 6003-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6003-2RS instead.", "The non-contact lip of 6003-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6003-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-RSR bearing?", "a": "A 6003-RSR deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6003-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2RSL — two low-friction non-contact elastomer seals, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 39 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-RSR." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6003-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.25, "fatigue_load_limit_kN": 0.137, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 41, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6203; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6003-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6003-2RS for that.", "Shielded 6003-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6003-2Z (one shield: 6003-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6003-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6003-2Z for high-contamination positions.", "The 6.37/3.25 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6003-ZZ bearing?", "a": "A 6003-ZZ deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 6003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 6003-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6003-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6003-2Z — two non-contact sheet-metal shields, 17×35×10 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.25 kN, Pu 0.137 kN, limiting speed 22000 r/min, mass 41 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6003-ZZ." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7003", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6003-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6004-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6004-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 20, "D_mm": 42, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 5, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 69, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6004-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6004-RSR run faster than contact-seal 6004-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6004-2RS instead.", "The non-contact lip of 6004-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6004-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6004-RSR bearing?", "a": "A 6004-RSR deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6004 bore code work?", "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6004-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 20 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6004-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6004-2RSL — two low-friction non-contact elastomer seals, 20×42×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 5 kN, Pu 0.212 kN, limiting speed 19000 r/min, mass 69 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6004-RSR." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7004", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6004-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6005-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6005-2RSL", "series": "6000-series", "type": "deep_groove", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fans and blowers", "electric motors", "centrifugal pumps", "small gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6005-RSR run faster than contact-seal 6005-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6005-2RS instead.", "The non-contact lip of 6005-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6005-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6005-RSR bearing?", "a": "A 6005-RSR deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6005 bore code work?", "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6005-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 25 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6005-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6005-2RSL — two low-friction non-contact elastomer seals, 25×47×12 mm per ISO 15. Quoted values: C 11.9 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 16000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6005-RSR." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7005", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6005-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6006-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6006-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 8.3, "fatigue_load_limit_kN": 0.355, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6006-RSR run faster than contact-seal 6006-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6006-2RS instead.", "The non-contact lip of 6006-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6006-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/8.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6006-RSR bearing?", "a": "A 6006-RSR deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6006 bore code work?", "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6006-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 30 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6006-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6006-2RZ — two low-friction non-contact elastomer seals, 30×55×13 mm per ISO 15. Quoted values: C 13.8 kN, C0 8.3 kN, Pu 0.355 kN, limiting speed 14000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6006-RSR." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty." }, { "equiv_sku": "7006", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6006-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6007-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6007-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.8, "static_load_kN": 10.2, "fatigue_load_limit_kN": 0.44, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6007-RSR run faster than contact-seal 6007-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6007-2RS instead.", "The non-contact lip of 6007-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6007-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.8/10.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6007-RSR bearing?", "a": "A 6007-RSR deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6007 bore code work?", "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6007-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 35 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6007-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6007-2RZ — two low-friction non-contact elastomer seals, 35×62×14 mm per ISO 15. Quoted values: C 16.8 kN, C0 10.2 kN, Pu 0.44 kN, limiting speed 12000 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6007-RSR." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7007", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6007-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6008-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6008-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 11, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6008-RSR run faster than contact-seal 6008-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6008-2RS instead.", "The non-contact lip of 6008-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6008-RSR.", "SKF catalogues the low-friction seal as 6008-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/11 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6008-RSR bearing?", "a": "A 6008-RSR deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6008 bore code work?", "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6008-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 40 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6008-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6008-2RZ — two low-friction non-contact elastomer seals, 40×68×15 mm per ISO 15. Quoted values: C 17.8 kN, C0 11 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6008-RSR." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7008", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6008-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6010-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6010-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 15.6, "fatigue_load_limit_kN": 0.71, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.", "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6010-RSR run faster than contact-seal 6010-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6010-2RS instead.", "The non-contact lip of 6010-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6010-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 22.9/15.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6010-RSR bearing?", "a": "A 6010-RSR deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6010 bore code work?", "a": "The last two digits of 6010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6010-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 50 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6010-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6010-2RZ — two low-friction non-contact elastomer seals, 50×80×16 mm per ISO 15. Quoted values: C 22.9 kN, C0 15.6 kN, Pu 0.71 kN, limiting speed 9000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6010-RSR." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7010", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6010-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6012-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6012-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 30.7, "static_load_kN": 23.2, "fatigue_load_limit_kN": 0.98, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 430, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6012 with C3 for those conditions.", "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6012-RSR run faster than contact-seal 6012-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6012-2RS instead.", "The non-contact lip of 6012-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6012-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 30.7/23.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6012-RSR bearing?", "a": "A 6012-RSR deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6012 bore code work?", "a": "The last two digits of 6012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6012-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 60 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6012-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6012-2RZ — two low-friction non-contact elastomer seals, 60×95×18 mm per ISO 15. Quoted values: C 30.7 kN, C0 23.2 kN, Pu 0.98 kN, limiting speed 7500 r/min, mass 430 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6012-RSR." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7012", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6012-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6015-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6015-2RZ", "series": "6000-series", "type": "deep_groove", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 41.6, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.43, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 670, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6015 with C3 for those conditions.", "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "RSR low-friction seals on 6015-RSR run faster than contact-seal 6015-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6015-2RS instead.", "The non-contact lip of 6015-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6015-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 41.6/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6015-RSR bearing?", "a": "A 6015-RSR deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6015 bore code work?", "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6015-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6000 compare with other series at the same 75 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6015-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6015-2RZ — two low-friction non-contact elastomer seals, 75×115×20 mm per ISO 15. Quoted values: C 41.6 kN, C0 33.5 kN, Pu 1.43 kN, limiting speed 6000 r/min, mass 670 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6015-RSR." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7015", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6015-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021", "brand": "SKF", "manufacturer_designation": "SKF 6021", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6021 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×160×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6021 units.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6021 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6021-2Z (shields) and 6021-2RSH (contact seals), not suffix-free 6021.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021 bearing?", "a": "A 6021 deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6021 mean?", "a": "A bare 6021 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021 — the open (unsealed) execution, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 5300 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6021-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6021-2RS runs slower and cooler-limited than the open 6021; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6021-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6021-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed. The single-seal catalogue number is 6021-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6021-RS1 exists for arrangements that lubricate through the open side; fitting 6021-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-2RS bearing?", "a": "A 6021-2RS deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6021-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 2400 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-2RS." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6021-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6021-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6021-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6021-2RS for that.", "Shielded 6021-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6021-2Z (one shield: 6021-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6021-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6021-2Z for high-contamination positions.", "The 76.1/65.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6021-ZZ bearing?", "a": "A 6021-ZZ deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6021 bore code work?", "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6021-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 105 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6021-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6021-2Z — two non-contact sheet-metal shields, 105×160×26 mm per ISO 15. Quoted values: C 76.1 kN, C0 65.5 kN, Pu 2.4 kN, limiting speed 4300 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6021-ZZ." } ], "cross_ref": [ { "equiv_sku": "6021", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7021", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6021-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022", "brand": "SKF", "manufacturer_designation": "SKF 6022", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1950, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6022 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×170×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6022 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6022-C3. No clearance suffix means normal CN clearance.", "The open 6022 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6022-2Z (shields) and 6022-2RSH (contact seals), not suffix-free 6022.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022 bearing?", "a": "A 6022 deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6022 mean?", "a": "A bare 6022 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022 — the open (unsealed) execution, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 5000 r/min, mass 1950 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6022-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 2000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6022-2RS runs slower and cooler-limited than the open 6022; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6022-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6022-2RS.", "SKF catalogues the contact-sealed version as 6022-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed. The single-seal catalogue number is 6022-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6022-RS1 exists for arrangements that lubricate through the open side; fitting 6022-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-2RS bearing?", "a": "A 6022-2RS deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6022-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 2400 r/min, mass 2000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-2RS." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6022-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6022-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 85.2, "static_load_kN": 73.5, "fatigue_load_limit_kN": 2.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 2050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6022-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6022-2RS for that.", "Shielded 6022-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6022-2Z (one shield: 6022-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6022-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6022-2Z for high-contamination positions.", "The 85.2/73.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6022-ZZ bearing?", "a": "A 6022-ZZ deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6022 bore code work?", "a": "The last two digits of 6022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6022-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 110 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6022-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6022-2Z — two non-contact sheet-metal shields, 110×170×28 mm per ISO 15. Quoted values: C 85.2 kN, C0 73.5 kN, Pu 2.6 kN, limiting speed 4000 r/min, mass 2050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6022-ZZ." } ], "cross_ref": [ { "equiv_sku": "6022", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7022", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6022-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024", "brand": "SKF", "manufacturer_designation": "SKF 6024", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 2100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6024 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×180×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6024 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6024-2Z (shields) and 6024-2RSH (contact seals), not suffix-free 6024.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024 bearing?", "a": "A 6024 deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6024 mean?", "a": "A bare 6024 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024 — the open (unsealed) execution, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 4800 r/min, mass 2100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6024-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 2150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6024-2RS runs slower and cooler-limited than the open 6024; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6024-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6024-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed. The single-seal catalogue number is 6024-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6024-RS1 exists for arrangements that lubricate through the open side; fitting 6024-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-2RS bearing?", "a": "A 6024-2RS deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6024-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 2200 r/min, mass 2150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-2RS." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6024-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6024-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 88.4, "static_load_kN": 80, "fatigue_load_limit_kN": 2.75, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6024-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6024-2RS for that.", "Shielded 6024-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 180 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6024-ZZ.", "SKF spells the shielded version 6024-2Z (one shield: 6024-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6024-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6024-2Z for high-contamination positions.", "The 88.4/80 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6024-ZZ bearing?", "a": "A 6024-ZZ deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6024 bore code work?", "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6024-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 120 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (180×28 mm, 30.0 mm radial section) at 120 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6024-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6024-2Z — two non-contact sheet-metal shields, 120×180×28 mm per ISO 15. Quoted values: C 88.4 kN, C0 80 kN, Pu 2.75 kN, limiting speed 3800 r/min, mass 2200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6024-ZZ." } ], "cross_ref": [ { "equiv_sku": "6024", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6024-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026", "brand": "SKF", "manufacturer_designation": "SKF 6026", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6026.", "The open 6026 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6026-2Z (shields) and 6026-2RSH (contact seals), not suffix-free 6026.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026 bearing?", "a": "A 6026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6026 mean?", "a": "A bare 6026 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026 — the open (unsealed) execution, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 4300 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6026-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 3300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6026-2RS runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6026-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6026-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7000 r/min thermal reference speed. The single-seal catalogue number is 6026-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6026-RS1 exists for arrangements that lubricate through the open side; fitting 6026-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-2RS bearing?", "a": "A 6026-2RS deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6026-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 2000 r/min, mass 3300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-2RS." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6026-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6026-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 3.35, "reference_speed_rpm": 7000, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 3350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6026-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.", "Shielded 6026-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6026-2Z (one shield: 6026-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6026-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6026-2Z for high-contamination positions.", "The 112/100 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6026-ZZ bearing?", "a": "A 6026-ZZ deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6026 bore code work?", "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6026-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 130 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6026-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6026-2Z — two non-contact sheet-metal shields, 130×200×33 mm per ISO 15. Quoted values: C 112 kN, C0 100 kN, Pu 3.35 kN, limiting speed 3400 r/min, mass 3350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6026-ZZ." } ], "cross_ref": [ { "equiv_sku": "6026", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6026-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028", "brand": "SKF", "manufacturer_designation": "SKF 6028", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 3450, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6028 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6028-C3. No clearance suffix means normal CN clearance.", "The open 6028 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6028-2Z (shields) and 6028-2RSH (contact seals), not suffix-free 6028.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028 bearing?", "a": "A 6028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6028 mean?", "a": "A bare 6028 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028 — the open (unsealed) execution, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 4000 r/min, mass 3450 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6028-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6028-2RS runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6028-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-2RS.", "SKF catalogues the contact-sealed version as 6028-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6700 r/min thermal reference speed. The single-seal catalogue number is 6028-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6028-RS1 exists for arrangements that lubricate through the open side; fitting 6028-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-2RS bearing?", "a": "A 6028-2RS deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6028-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 1800 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-2RS." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6028-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6028-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 108, "fatigue_load_limit_kN": 3.45, "reference_speed_rpm": 6700, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 3550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6028-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.", "Shielded 6028-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 6028-2Z (one shield: 6028-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6028-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6028-2Z for high-contamination positions.", "The 111/108 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6028-ZZ bearing?", "a": "A 6028-ZZ deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6028 bore code work?", "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6028-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 140 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6028-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6028-2Z — two non-contact sheet-metal shields, 140×210×33 mm per ISO 15. Quoted values: C 111 kN, C0 108 kN, Pu 3.45 kN, limiting speed 3200 r/min, mass 3550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6028-ZZ." } ], "cross_ref": [ { "equiv_sku": "6028", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6028-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030", "brand": "SKF", "manufacturer_designation": "SKF 6030", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 4300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6030 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6030 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6030-2Z (shields) and 6030-2RSH (contact seals), not suffix-free 6030.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030 bearing?", "a": "A 6030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6030 mean?", "a": "A bare 6030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030 — the open (unsealed) execution, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3800 r/min, mass 4300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6030-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 4350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6030-2RS runs slower and cooler-limited than the open 6030; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6030-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6030-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 6030-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6000 r/min thermal reference speed. The single-seal catalogue number is 6030-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6030-RS1 exists for arrangements that lubricate through the open side; fitting 6030-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-2RS bearing?", "a": "A 6030-2RS deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6030-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2RS1 — two contact elastomer seals over a lifetime grease fill, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 1700 r/min, mass 4350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-2RS." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6030-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6030-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 125, "static_load_kN": 125, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 4400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6030-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.", "Shielded 6030-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-ZZ.", "SKF spells the shielded version 6030-2Z (one shield: 6030-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6030-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6030-2Z for high-contamination positions.", "The 125/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6030-ZZ bearing?", "a": "A 6030-ZZ deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6030 bore code work?", "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6030-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 150 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6030-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6030-2Z — two non-contact sheet-metal shields, 150×225×35 mm per ISO 15. Quoted values: C 125 kN, C0 125 kN, Pu 3.9 kN, limiting speed 3000 r/min, mass 4400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6030-ZZ." } ], "cross_ref": [ { "equiv_sku": "6030", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6030-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032", "brand": "SKF", "manufacturer_designation": "SKF 6032", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6032.", "The open 6032 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6032-2Z (shields) and 6032-2RSH (contact seals), not suffix-free 6032.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032 bearing?", "a": "A 6032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6032 mean?", "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032 — the open (unsealed) execution, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 3600 r/min, mass 5200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6032-2RS1", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 5300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6032-2RS runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6032-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6032-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6032-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6032-RS1 exists for arrangements that lubricate through the open side; fitting 6032-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-2RS bearing?", "a": "A 6032-2RS deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6032-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2RS1 — two contact elastomer seals over a lifetime grease fill, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 1600 r/min, mass 5300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-2RS." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6032-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6032-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 143, "static_load_kN": 143, "fatigue_load_limit_kN": 4.3, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 5400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6032-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.", "Shielded 6032-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6032-2Z (one shield: 6032-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6032-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6032-2Z for high-contamination positions.", "The 143/143 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6032-ZZ bearing?", "a": "A 6032-ZZ deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6032 bore code work?", "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6032-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6000 compare with other series at the same 160 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6032-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6032-2Z — two non-contact sheet-metal shields, 160×240×38 mm per ISO 15. Quoted values: C 143 kN, C0 143 kN, Pu 4.3 kN, limiting speed 2800 r/min, mass 5400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6032-ZZ." } ], "cross_ref": [ { "equiv_sku": "6032", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6032-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6034", "brand": "SKF", "manufacturer_designation": "SKF 6034", "series": "6000-series", "type": "deep_groove", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 7000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6034 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6034 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6034-C3. No clearance suffix means normal CN clearance.", "The open 6034 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6034-2Z (shields) and 6034-2RSH (contact seals), not suffix-free 6034.", "The 168/173 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6034 bearing?", "a": "A 6034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6034 bore code work?", "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6034 mean?", "a": "A bare 6034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 170 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6034?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6034 — the open (unsealed) execution, 170×260×42 mm per ISO 15. Quoted values: C 168 kN, C0 173 kN, Pu 5 kN, limiting speed 3200 r/min, mass 7000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6034." } ], "cross_ref": [ { "equiv_sku": "6034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6036", "brand": "SKF", "manufacturer_designation": "SKF 6036", "series": "6000-series", "type": "deep_groove", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9100, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6036 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6036 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6036-2Z (shields) and 6036-2RSH (contact seals), not suffix-free 6036.", "The 190/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6036 bearing?", "a": "A 6036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6036 bore code work?", "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6036 mean?", "a": "A bare 6036 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 180 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (280×46 mm, 50.0 mm radial section) at 180 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6036?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6036 — the open (unsealed) execution, 180×280×46 mm per ISO 15. Quoted values: C 190 kN, C0 200 kN, Pu 5.6 kN, limiting speed 3000 r/min, mass 9100 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6036." } ], "cross_ref": [ { "equiv_sku": "6036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6038", "brand": "SKF", "manufacturer_designation": "SKF 6038", "series": "6000-series", "type": "deep_groove", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 195, "static_load_kN": 216, "fatigue_load_limit_kN": 5.85, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 9550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6038 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6038 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6038.", "The open 6038 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6038-2Z (shields) and 6038-2RSH (contact seals), not suffix-free 6038.", "The 195/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6038 bearing?", "a": "A 6038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6038 bore code work?", "a": "The last two digits of 6038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6038 mean?", "a": "A bare 6038 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 190 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (290×46 mm, 50.0 mm radial section) at 190 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6038?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6038 — the open (unsealed) execution, 190×290×46 mm per ISO 15. Quoted values: C 195 kN, C0 216 kN, Pu 5.85 kN, limiting speed 3000 r/min, mass 9550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6038." } ], "cross_ref": [ { "equiv_sku": "6038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6044", "brand": "SKF", "manufacturer_designation": "SKF 6044", "series": "6000-series", "type": "deep_groove", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 247, "static_load_kN": 290, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6044 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×340×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6044.", "The open 6044 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6044-2Z (shields) and 6044-2RSH (contact seals), not suffix-free 6044.", "The 247/290 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6044 bearing?", "a": "A 6044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6044 bore code work?", "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6044 mean?", "a": "A bare 6044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 220 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6044?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6044 — the open (unsealed) execution, 220×340×56 mm per ISO 15. Quoted values: C 247 kN, C0 290 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6044." } ], "cross_ref": [ { "equiv_sku": "6044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6048", "brand": "SKF", "manufacturer_designation": "SKF 6048", "series": "6000-series", "type": "deep_groove", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 315, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 17000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 240 mm bore uses a smaller 360 mm OD than a 6248; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6048 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6048 units.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6048 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6048-2Z (shields) and 6048-2RSH (contact seals), not suffix-free 6048.", "The 255/315 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6048 bearing?", "a": "A 6048 deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6048 bore code work?", "a": "The last two digits of 6048 are bore code 48, giving 48 × 5 = 240 mm bore. The 360 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6048 mean?", "a": "A bare 6048 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 240 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (360×56 mm, 60.0 mm radial section) at 240 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6048?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6048 — the open (unsealed) execution, 240×360×56 mm per ISO 15. Quoted values: C 255 kN, C0 315 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 17000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6048." } ], "cross_ref": [ { "equiv_sku": "6048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6052", "brand": "SKF", "manufacturer_designation": "SKF 6052", "series": "6000-series", "type": "deep_groove", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 291, "static_load_kN": 375, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 25000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6052 carries bore code 52 = 260 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 260 mm bore uses a smaller 400 mm OD than a 6252; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6052 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6052 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6052-C3. No clearance suffix means normal CN clearance.", "The open 6052 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6052-2Z (shields) and 6052-2RSH (contact seals), not suffix-free 6052.", "The 291/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6052 bearing?", "a": "A 6052 deep-groove ball bearing has a 260 mm bore, 400 mm outer diameter and 65 mm width (10.236 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6052 bore code work?", "a": "The last two digits of 6052 are bore code 52, giving 52 × 5 = 260 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6052 mean?", "a": "A bare 6052 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 260 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (400×65 mm, 70.0 mm radial section) at 260 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6052?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6052 — the open (unsealed) execution, 260×400×65 mm per ISO 15. Quoted values: C 291 kN, C0 375 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 25000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6052." } ], "cross_ref": [ { "equiv_sku": "6052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6056", "brand": "SKF", "manufacturer_designation": "SKF 6056", "series": "6000-series", "type": "deep_groove", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 302, "static_load_kN": 405, "fatigue_load_limit_kN": 9.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 26000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (ISO 15 diameter series 0) the last two digits encode the bore: 6056 carries bore code 56 = 280 mm. Outside diameter 420 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 280 mm bore uses a smaller 420 mm OD than a 6256; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6056 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×420×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6056 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6056.", "The open 6056 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6056-2Z (shields) and 6056-2RSH (contact seals), not suffix-free 6056.", "The 302/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6056 bearing?", "a": "A 6056 deep-groove ball bearing has a 280 mm bore, 420 mm outer diameter and 65 mm width (11.024 × 16.535 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6056 bore code work?", "a": "The last two digits of 6056 are bore code 56, giving 56 × 5 = 280 mm bore. The 420 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6056 mean?", "a": "A bare 6056 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6000 compare with other series at the same 280 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (420×65 mm, 70.0 mm radial section) at 280 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "What is the SKF designation and catalogue data for 6056?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6056 — the open (unsealed) execution, 280×420×65 mm per ISO 15. Quoted values: C 302 kN, C0 405 kN, Pu 9.3 kN, limiting speed 1900 r/min, mass 26000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6056." } ], "cross_ref": [ { "equiv_sku": "6056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800", "brand": "SKF", "manufacturer_designation": "SKF 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 48000, "max_rpm": 48000, "weight_g": 5, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "The open 61800 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×19×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61800 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61800-C3. No clearance suffix means normal CN clearance.", "The open 61800 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61800-2Z (shields) and 61800-2RSH (contact seals), not suffix-free 61800.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800 bearing?", "a": "A 61800 deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61800 mean?", "a": "A bare 61800 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800 — the open (unsealed) execution, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 48000 r/min, mass 5 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61800-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "Contact seals add drag and heat: 61800-2RS runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61800-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 19 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61800-2RS.", "SKF catalogues the contact-sealed version as 61800-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 22000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 80000 r/min thermal reference speed.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-2RS bearing?", "a": "A 61800-2RS deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61800-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 22000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-2RS." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61800-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.72, "static_load_kN": 0.83, "fatigue_load_limit_kN": 0.036, "reference_speed_rpm": 80000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61800 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61800 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6200.", "ZZ shields are non-contact: 61800-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61800-2RS for that.", "Shielded 61800-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF spells the shielded version 61800-2Z (one shield: 61800-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.72/0.83 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61800-ZZ bearing?", "a": "A 61800-ZZ deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61800 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61800 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61800-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6200, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61800-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61800-2Z — two non-contact sheet-metal shields, 10×19×5 mm per ISO 15. Quoted values: C 1.72 kN, C0 0.83 kN, Pu 0.036 kN, limiting speed 38000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61800-ZZ." } ], "cross_ref": [ { "equiv_sku": "61800", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61800-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801", "brand": "SKF", "manufacturer_designation": "SKF 61801", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 43000, "max_rpm": 43000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "The open 61801 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×21×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61801 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61801-2Z (shields) and 61801-2RSH (contact seals), not suffix-free 61801.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801 bearing?", "a": "A 61801 deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61801 mean?", "a": "A bare 61801 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801 — the open (unsealed) execution, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 43000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61801-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "Contact seals add drag and heat: 61801-2RS runs slower and cooler-limited than the open 61801; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61801-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61801-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-2RS bearing?", "a": "A 61801-2RS deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61801-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 20000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-2RS." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61801-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.74, "static_load_kN": 0.915, "fatigue_load_limit_kN": 0.039, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61801 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61801 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6201.", "ZZ shields are non-contact: 61801-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61801-2RS for that.", "Shielded 61801-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61801-2Z (one shield: 61801-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.74/0.915 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61801-ZZ bearing?", "a": "A 61801-ZZ deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61801 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61801 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61801-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 12 mm bore?", "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6201, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61801-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61801-2Z — two non-contact sheet-metal shields, 12×21×5 mm per ISO 15. Quoted values: C 1.74 kN, C0 0.915 kN, Pu 0.039 kN, limiting speed 36000 r/min, mass 6 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61801-ZZ." } ], "cross_ref": [ { "equiv_sku": "61801", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802", "brand": "SKF", "manufacturer_designation": "SKF 61802", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 38000, "max_rpm": 38000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "The open 61802 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×24×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61802 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61802-2Z (shields) and 61802-2RSH (contact seals), not suffix-free 61802.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802 bearing?", "a": "A 61802 deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61802 mean?", "a": "A bare 61802 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802 — the open (unsealed) execution, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 38000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61802-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "Contact seals add drag and heat: 61802-2RS runs slower and cooler-limited than the open 61802; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61802-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61802-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61802-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 17000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 60000 r/min thermal reference speed.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-2RS bearing?", "a": "A 61802-2RS deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61802-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 17000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-2RS." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61802-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1.9, "static_load_kN": 1.1, "fatigue_load_limit_kN": 0.048, "reference_speed_rpm": 60000, "limiting_speed_rpm": 30000, "max_rpm": 30000, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61802 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61802 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6202.", "ZZ shields are non-contact: 61802-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61802-2RS for that.", "Shielded 61802-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61802-ZZ.", "SKF spells the shielded version 61802-2Z (one shield: 61802-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 1.9/1.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61802-ZZ bearing?", "a": "A 61802-ZZ deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61802 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61802 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61802-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 15 mm bore?", "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6202, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61802-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61802-2Z — two non-contact sheet-metal shields, 15×24×5 mm per ISO 15. Quoted values: C 1.9 kN, C0 1.1 kN, Pu 0.048 kN, limiting speed 30000 r/min, mass 7 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61802-ZZ." } ], "cross_ref": [ { "equiv_sku": "61802", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803", "brand": "SKF", "manufacturer_designation": "SKF 61803", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "The open 61803 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×26×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61803 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61803 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61803-2Z (shields) and 61803-2RSH (contact seals), not suffix-free 61803.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803 bearing?", "a": "A 61803 deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61803 mean?", "a": "A bare 61803 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803 — the open (unsealed) execution, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 34000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "Contact seals add drag and heat: 61803-2RS runs slower and cooler-limited than the open 61803; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61803-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61803-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-2RS bearing?", "a": "A 61803-2RS deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61803-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 16000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-2RS." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61803-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "RSR low-friction seals on 61803-RSR run faster than contact-seal 61803-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61803-2RS instead.", "The non-contact lip of 61803-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61803-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-RSR bearing?", "a": "A 61803-RSR deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61803-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2RZ — two low-friction non-contact elastomer seals, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-RSR." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61803-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.03, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61803 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61803 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6203.", "ZZ shields are non-contact: 61803-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61803-2RS for that.", "Shielded 61803-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 61803-2Z (one shield: 61803-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.03/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61803-ZZ bearing?", "a": "A 61803-ZZ deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61803 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61803 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61803-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6203, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61803-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61803-2Z — two non-contact sheet-metal shields, 17×26×5 mm per ISO 15. Quoted values: C 2.03 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 28000 r/min, mass 8 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61803-ZZ." } ], "cross_ref": [ { "equiv_sku": "61803", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61804-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61804-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 20, "D_mm": 32, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.03, "static_load_kN": 2.32, "fatigue_load_limit_kN": 0.104, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.", "RSR low-friction seals on 61804-RSR run faster than contact-seal 61804-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61804-2RS instead.", "The non-contact lip of 61804-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61804-RSR.", "SKF catalogues the low-friction seal as 61804-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.03/2.32 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61804-RSR bearing?", "a": "A 61804-RSR deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61804 bore code work?", "a": "The last two digits of 61804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61804-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 20 mm bore?", "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61804-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61804-2RZ — two low-friction non-contact elastomer seals, 20×32×7 mm per ISO 15. Quoted values: C 4.03 kN, C0 2.32 kN, Pu 0.104 kN, limiting speed 22000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61804-RSR." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×32×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71804", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61804-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805", "brand": "SKF", "manufacturer_designation": "SKF 61805", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 24000, "max_rpm": 24000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "The open 61805 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×37×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61805 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61805-2Z (shields) and 61805-2RSH (contact seals), not suffix-free 61805.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805 bearing?", "a": "A 61805 deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61805 mean?", "a": "A bare 61805 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805 — the open (unsealed) execution, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 24000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "Contact seals add drag and heat: 61805-2RS runs slower and cooler-limited than the open 61805; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61805-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61805-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 11000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 38000 r/min thermal reference speed.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-2RS bearing?", "a": "A 61805-2RS deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61805-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RS1 — two contact elastomer seals over a lifetime grease fill, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 11000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-2RS." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61805-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61805-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 25, "D_mm": 37, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.6, "fatigue_load_limit_kN": 0.125, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.", "RSR low-friction seals on 61805-RSR run faster than contact-seal 61805-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61805-2RS instead.", "The non-contact lip of 61805-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61805-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61805-RSR bearing?", "a": "A 61805-RSR deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61805 bore code work?", "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61805-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 25 mm bore?", "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61805-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61805-2RZ — two low-friction non-contact elastomer seals, 25×37×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.6 kN, Pu 0.125 kN, limiting speed 19000 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61805-RSR." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×37×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71805", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61805-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806", "brand": "SKF", "manufacturer_designation": "SKF 61806", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "The open 61806 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×42×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61806 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-C3. No clearance suffix means normal CN clearance.", "The open 61806 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61806-2Z (shields) and 61806-2RSH (contact seals), not suffix-free 61806.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806 bearing?", "a": "A 61806 deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61806 mean?", "a": "A bare 61806 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806 — the open (unsealed) execution, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 20000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "Contact seals add drag and heat: 61806-2RS runs slower and cooler-limited than the open 61806; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61806-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61806-2RS.", "SKF catalogues the contact-sealed version as 61806-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-2RS bearing?", "a": "A 61806-2RS deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61806-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 9500 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-2RS." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61806-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61806-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 30, "D_mm": 42, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 2.9, "fatigue_load_limit_kN": 0.146, "reference_speed_rpm": 32000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.", "RSR low-friction seals on 61806-RSR run faster than contact-seal 61806-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61806-2RS instead.", "The non-contact lip of 61806-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61806-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 16000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/2.9 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61806-RSR bearing?", "a": "A 61806-RSR deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61806 bore code work?", "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61806-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 30 mm bore?", "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61806-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61806-2RZ — two low-friction non-contact elastomer seals, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 16000 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-RSR." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×42×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71806", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61806-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807", "brand": "SKF", "manufacturer_designation": "SKF 61807", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "The open 61807 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×47×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61807 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61807-2Z (shields) and 61807-2RSH (contact seals), not suffix-free 61807.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807 bearing?", "a": "A 61807 deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61807 mean?", "a": "A bare 61807 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807 — the open (unsealed) execution, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 18000 r/min, mass 29 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 22, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "Contact seals add drag and heat: 61807-2RS runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61807-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61807-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 8500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 30000 r/min thermal reference speed.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-2RS bearing?", "a": "A 61807-2RS deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61807-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RS1 — two contact elastomer seals over a lifetime grease fill, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 8500 r/min, mass 22 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-2RS." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61807-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61807-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 35, "D_mm": 47, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 3.35, "fatigue_load_limit_kN": 0.14, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.", "RSR low-friction seals on 61807-RSR run faster than contact-seal 61807-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61807-2RS instead.", "The non-contact lip of 61807-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61807-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/3.35 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61807-RSR bearing?", "a": "A 61807-RSR deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61807 bore code work?", "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61807-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 35 mm bore?", "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61807-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61807-2RZ — two low-friction non-contact elastomer seals, 35×47×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 3.35 kN, Pu 0.14 kN, limiting speed 15000 r/min, mass 30 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61807-RSR." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×47×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71807", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61807-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808", "brand": "SKF", "manufacturer_designation": "SKF 61808", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "The open 61808 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×52×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61808 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61808-2Z (shields) and 61808-2RSH (contact seals), not suffix-free 61808.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808 bearing?", "a": "A 61808 deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61808 mean?", "a": "A bare 61808 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808 — the open (unsealed) execution, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 16000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "Contact seals add drag and heat: 61808-2RS runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61808-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61808-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 7500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 26000 r/min thermal reference speed.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-2RS bearing?", "a": "A 61808-2RS deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61808-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RS1 — two contact elastomer seals over a lifetime grease fill, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 7500 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-2RS." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61808-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61808-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 40, "D_mm": 52, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.49, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 34, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6208.", "RSR low-friction seals on 61808-RSR run faster than contact-seal 61808-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61808-2RS instead.", "The non-contact lip of 61808-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61808-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.49/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61808-RSR bearing?", "a": "A 61808-RSR deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61808 bore code work?", "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61808-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 40 mm bore?", "a": "618 is an extra-thin section: 52×7 mm, only 6.0 mm radial section at 40 mm bore, far smaller than a 6208, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61808-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61808-2RZ — two low-friction non-contact elastomer seals, 40×52×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 13000 r/min, mass 34 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61808-RSR." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×52×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71808", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61808-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809", "brand": "SKF", "manufacturer_designation": "SKF 61809", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "The open 61809 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×58×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61809 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61809-2Z (shields) and 61809-2RSH (contact seals), not suffix-free 61809.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809 bearing?", "a": "A 61809 deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61809 mean?", "a": "A bare 61809 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809 — the open (unsealed) execution, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 14000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "Contact seals add drag and heat: 61809-2RS runs slower and cooler-limited than the open 61809; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61809-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61809-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 22000 r/min thermal reference speed.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-2RS bearing?", "a": "A 61809-2RS deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61809-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RS1 — two contact elastomer seals over a lifetime grease fill, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 6700 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-2RS." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61809-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61809-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 45, "D_mm": 58, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.63, "static_load_kN": 6.1, "fatigue_load_limit_kN": 0.26, "reference_speed_rpm": 22000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.", "RSR low-friction seals on 61809-RSR run faster than contact-seal 61809-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61809-2RS instead.", "The non-contact lip of 61809-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61809-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61809-RSR bearing?", "a": "A 61809-RSR deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61809 bore code work?", "a": "The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61809-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 45 mm bore?", "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61809-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61809-2RZ — two low-friction non-contact elastomer seals, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 11000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-RSR." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71809", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61809-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810", "brand": "SKF", "manufacturer_designation": "SKF 61810", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "The open 61810 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×65×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 65 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61810.", "The open 61810 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61810-2Z (shields) and 61810-2RSH (contact seals), not suffix-free 61810.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810 bearing?", "a": "A 61810 deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61810 mean?", "a": "A bare 61810 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810 — the open (unsealed) execution, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 13000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "Contact seals add drag and heat: 61810-2RS runs slower and cooler-limited than the open 61810; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61810-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61810-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 6000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 20000 r/min thermal reference speed.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-2RS bearing?", "a": "A 61810-2RS deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61810-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RS1 — two contact elastomer seals over a lifetime grease fill, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 6000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-2RS." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61810-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61810-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 50, "D_mm": 65, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.76, "static_load_kN": 6.8, "fatigue_load_limit_kN": 0.285, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 52, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61810 with C3 for those conditions.", "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "RSR low-friction seals on 61810-RSR run faster than contact-seal 61810-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61810-2RS instead.", "The non-contact lip of 61810-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 65 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61810-RSR.", "SKF catalogues the low-friction seal as 61810-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.76/6.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61810-RSR bearing?", "a": "A 61810-RSR deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61810 bore code work?", "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61810-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 50 mm bore?", "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61810-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61810-2RZ — two low-friction non-contact elastomer seals, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 10000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-RSR." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71810", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61810-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811", "brand": "SKF", "manufacturer_designation": "SKF 61811", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "The open 61811 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×72×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61811 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61811 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61811-2Z (shields) and 61811-2RSH (contact seals), not suffix-free 61811.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811 bearing?", "a": "A 61811 deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61811 mean?", "a": "A bare 61811 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811 — the open (unsealed) execution, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 12000 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "Contact seals add drag and heat: 61811-2RS runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61811-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61811-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 5300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 19000 r/min thermal reference speed.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-2RS bearing?", "a": "A 61811-2RS deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61811-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RS1 — two contact elastomer seals over a lifetime grease fill, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 5300 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-2RS." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61811-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61811-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 55, "D_mm": 72, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.04, "static_load_kN": 8.8, "fatigue_load_limit_kN": 0.375, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.", "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.", "RSR low-friction seals on 61811-RSR run faster than contact-seal 61811-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61811-2RS instead.", "The non-contact lip of 61811-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61811-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.04/8.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61811-RSR bearing?", "a": "A 61811-RSR deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61811 bore code work?", "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61811-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 55 mm bore?", "a": "618 is an extra-thin section: 72×9 mm, only 8.5 mm radial section at 55 mm bore, far smaller than a 6211, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61811-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61811-2RZ — two low-friction non-contact elastomer seals, 55×72×9 mm per ISO 15. Quoted values: C 9.04 kN, C0 8.8 kN, Pu 0.375 kN, limiting speed 9500 r/min, mass 83 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61811-RSR." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×72×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71811", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61811-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812", "brand": "SKF", "manufacturer_designation": "SKF 61812", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "The open 61812 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61812 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "The open 61812 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61812-2Z (shields) and 61812-2RSH (contact seals), not suffix-free 61812.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812 bearing?", "a": "A 61812 deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61812 mean?", "a": "A bare 61812 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812 — the open (unsealed) execution, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 11000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "Contact seals add drag and heat: 61812-2RS runs slower and cooler-limited than the open 61812; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61812-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 78 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61812-2RS.", "SKF catalogues the contact-sealed version as 61812-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 17000 r/min thermal reference speed.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-2RS bearing?", "a": "A 61812-2RS deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61812-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 4800 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-2RS." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61812-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61812-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 60, "D_mm": 78, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 11.4, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.", "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "RSR low-friction seals on 61812-RSR run faster than contact-seal 61812-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61812-2RS instead.", "The non-contact lip of 61812-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61812-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61812-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/11.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61812-RSR bearing?", "a": "A 61812-RSR deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61812 bore code work?", "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61812-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 60 mm bore?", "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61812-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61812-2RZ — two low-friction non-contact elastomer seals, 60×78×10 mm per ISO 15. Quoted values: C 11.9 kN, C0 11.4 kN, Pu 0.49 kN, limiting speed 8500 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61812-RSR." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×78×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71812", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61812-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813", "brand": "SKF", "manufacturer_designation": "SKF 61813", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "The open 61813 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61813 units.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61813 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61813-2Z (shields) and 61813-2RSH (contact seals), not suffix-free 61813.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813 bearing?", "a": "A 61813 deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61813 mean?", "a": "A bare 61813 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813 — the open (unsealed) execution, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 10000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "Contact seals add drag and heat: 61813-2RS runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61813-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61813-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-2RS bearing?", "a": "A 61813-2RS deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61813-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 4500 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-2RS." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61813-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61813-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 65, "D_mm": 85, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 12.7, "fatigue_load_limit_kN": 0.54, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61813 with C3 for those conditions.", "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.", "RSR low-friction seals on 61813-RSR run faster than contact-seal 61813-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61813-2RS instead.", "The non-contact lip of 61813-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61813-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/12.7 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61813-RSR bearing?", "a": "A 61813-RSR deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61813 bore code work?", "a": "The last two digits of 61813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61813-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 65 mm bore?", "a": "618 is an extra-thin section: 85×10 mm, only 10.0 mm radial section at 65 mm bore, far smaller than a 6213, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61813-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61813-2RZ — two low-friction non-contact elastomer seals, 65×85×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 12.7 kN, Pu 0.54 kN, limiting speed 8000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61813-RSR." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×85×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71813", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61813-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814", "brand": "SKF", "manufacturer_designation": "SKF 61814", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "The open 61814 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×90×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61814 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61814-2Z (shields) and 61814-2RSH (contact seals), not suffix-free 61814.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814 bearing?", "a": "A 61814 deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61814 mean?", "a": "A bare 61814 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814 — the open (unsealed) execution, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 9000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "Contact seals add drag and heat: 61814-2RS runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61814-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61814-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61814-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-2RS bearing?", "a": "A 61814-2RS deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61814-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 4300 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-2RS." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61814-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61814-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 70, "D_mm": 90, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.4, "static_load_kN": 13.2, "fatigue_load_limit_kN": 0.56, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.", "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.", "RSR low-friction seals on 61814-RSR run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.", "The non-contact lip of 61814-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61814-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.4/13.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61814-RSR bearing?", "a": "A 61814-RSR deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61814 bore code work?", "a": "The last two digits of 61814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61814-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 70 mm bore?", "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61814-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61814-2RZ — two low-friction non-contact elastomer seals, 70×90×10 mm per ISO 15. Quoted values: C 12.4 kN, C0 13.2 kN, Pu 0.56 kN, limiting speed 7500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61814-RSR." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×90×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71814", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61814-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815", "brand": "SKF", "manufacturer_designation": "SKF 61815", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "The open 61815 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×95×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61815 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61815 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61815-2Z (shields) and 61815-2RSH (contact seals), not suffix-free 61815.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815 bearing?", "a": "A 61815 deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61815 mean?", "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815 — the open (unsealed) execution, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 8500 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "Contact seals add drag and heat: 61815-2RS runs slower and cooler-limited than the open 61815; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61815-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61815-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-2RS bearing?", "a": "A 61815-2RS deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61815-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 4000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-2RS." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61815-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61815-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 75, "D_mm": 95, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.5, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.585, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.", "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "RSR low-friction seals on 61815-RSR run faster than contact-seal 61815-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61815-2RS instead.", "The non-contact lip of 61815-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61815-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 12.5/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61815-RSR bearing?", "a": "A 61815-RSR deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61815 bore code work?", "a": "The last two digits of 61815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61815-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 75 mm bore?", "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61815-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61815-2RZ — two low-friction non-contact elastomer seals, 75×95×10 mm per ISO 15. Quoted values: C 12.5 kN, C0 10.8 kN, Pu 0.585 kN, limiting speed 7000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61815-RSR." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×95×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71815", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61815-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816", "brand": "SKF", "manufacturer_designation": "SKF 61816", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "The open 61816 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61816 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816.", "The open 61816 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61816-2Z (shields) and 61816-2RSH (contact seals), not suffix-free 61816.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816 bearing?", "a": "A 61816 deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61816 mean?", "a": "A bare 61816 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61816?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816 — the open (unsealed) execution, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 8000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816." } ], "cross_ref": [ { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61816-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61816-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 80, "D_mm": 100, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 12.7, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.61, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 160, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.", "Contact seals add drag and heat: 61816-2RS runs slower and cooler-limited than the open 61816; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61816-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61816-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 12.7/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61816-2RS bearing?", "a": "A 61816-2RS deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61816 bore code work?", "a": "The last two digits of 61816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61816-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 80 mm bore?", "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61816-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61816-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×100×10 mm per ISO 15. Quoted values: C 12.7 kN, C0 11.2 kN, Pu 0.61 kN, limiting speed 3600 r/min, mass 160 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61816-2RS." } ], "cross_ref": [ { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×100×10 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71816", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61816-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817", "brand": "SKF", "manufacturer_designation": "SKF 61817", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 260, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "The open 61817 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×110×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61817 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61817-2Z (shields) and 61817-2RSH (contact seals), not suffix-free 61817.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817 bearing?", "a": "A 61817 deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61817 mean?", "a": "A bare 61817 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817 — the open (unsealed) execution, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 7500 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "Contact seals add drag and heat: 61817-2RS runs slower and cooler-limited than the open 61817; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61817-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61817-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-2RS bearing?", "a": "A 61817-2RS deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61817-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RS1 — two contact elastomer seals over a lifetime grease fill, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 3400 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-2RS." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61817-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61817-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 85, "D_mm": 110, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 16.6, "fatigue_load_limit_kN": 0.88, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.", "RSR low-friction seals on 61817-RSR run faster than contact-seal 61817-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61817-2RS instead.", "The non-contact lip of 61817-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61817-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/16.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61817-RSR bearing?", "a": "A 61817-RSR deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61817 bore code work?", "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61817-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 85 mm bore?", "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61817-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61817-2RZ — two low-friction non-contact elastomer seals, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 6000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817-RSR." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×110×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71817", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61817-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818", "brand": "SKF", "manufacturer_designation": "SKF 61818", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 280, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "The open 61818 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61818 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-C3. No clearance suffix means normal CN clearance.", "The open 61818 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61818-2Z (shields) and 61818-2RSH (contact seals), not suffix-free 61818.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818 bearing?", "a": "A 61818 deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61818 mean?", "a": "A bare 61818 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818 — the open (unsealed) execution, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 7000 r/min, mass 280 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "Contact seals add drag and heat: 61818-2RS runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61818-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-2RS.", "SKF catalogues the contact-sealed version as 61818-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-2RS bearing?", "a": "A 61818-2RS deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61818-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RS1 — two contact elastomer seals over a lifetime grease fill, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 3200 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-2RS." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61818-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61818-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 90, "D_mm": 115, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.5, "static_load_kN": 17, "fatigue_load_limit_kN": 0.915, "reference_speed_rpm": 11000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.", "RSR low-friction seals on 61818-RSR run faster than contact-seal 61818-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61818-2RS instead.", "The non-contact lip of 61818-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61818-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61818-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5600 r/min limiting speed, closer to the open bearing's 11000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 19.5/17 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61818-RSR bearing?", "a": "A 61818-RSR deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61818 bore code work?", "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61818-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 90 mm bore?", "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61818-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61818-2RZ — two low-friction non-contact elastomer seals, 90×115×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 17 kN, Pu 0.915 kN, limiting speed 5600 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61818-RSR." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×115×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71818", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61818-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819", "brand": "SKF", "manufacturer_designation": "SKF 61819", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 290, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "The open 61819 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×120×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.", "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61819 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61819-2Z (shields) and 61819-2RSH (contact seals), not suffix-free 61819.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819 bearing?", "a": "A 61819 deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61819 mean?", "a": "A bare 61819 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61819?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819 — the open (unsealed) execution, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 6700 r/min, mass 290 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819." } ], "cross_ref": [ { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61819-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61819-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 95, "D_mm": 120, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 19.9, "static_load_kN": 17.6, "fatigue_load_limit_kN": 0.93, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.", "Contact seals add drag and heat: 61819-2RS runs slower and cooler-limited than the open 61819; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61819-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61819-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 11000 r/min thermal reference speed.", "The 19.9/17.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61819-2RS bearing?", "a": "A 61819-2RS deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61819 bore code work?", "a": "The last two digits of 61819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61819-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 95 mm bore?", "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61819-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61819-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×120×13 mm per ISO 15. Quoted values: C 19.9 kN, C0 17.6 kN, Pu 0.93 kN, limiting speed 3000 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61819-2RS." } ], "cross_ref": [ { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×120×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71819", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61819-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820", "brand": "SKF", "manufacturer_designation": "SKF 61820", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "The open 61820 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×125×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61820 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61820-2Z (shields) and 61820-2RSH (contact seals), not suffix-free 61820.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820 bearing?", "a": "A 61820 deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61820 mean?", "a": "A bare 61820 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820 — the open (unsealed) execution, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 6300 r/min, mass 300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "Contact seals add drag and heat: 61820-2RS runs slower and cooler-limited than the open 61820; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61820-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61820-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61820-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-2RS bearing?", "a": "A 61820-2RS deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61820-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RS1 — two contact elastomer seals over a lifetime grease fill, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 3000 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-2RS." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61820-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61820-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 100, "D_mm": 125, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.95, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 320, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.", "RSR low-friction seals on 61820-RSR run faster than contact-seal 61820-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61820-2RS instead.", "The non-contact lip of 61820-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61820-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5300 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61820-RSR bearing?", "a": "A 61820-RSR deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61820 bore code work?", "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61820-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 100 mm bore?", "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61820-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61820-2RZ — two low-friction non-contact elastomer seals, 100×125×13 mm per ISO 15. Quoted values: C 17.8 kN, C0 18.3 kN, Pu 0.95 kN, limiting speed 5300 r/min, mass 320 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61820-RSR." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×125×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71820", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61820-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821", "brand": "SKF", "manufacturer_designation": "SKF 61821", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 310, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "The open 61821 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61821 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61821 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61821-2Z (shields) and 61821-2RSH (contact seals), not suffix-free 61821.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821 bearing?", "a": "A 61821 deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61821 mean?", "a": "A bare 61821 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821 — the open (unsealed) execution, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 6300 r/min, mass 310 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "Contact seals add drag and heat: 61821-2RS runs slower and cooler-limited than the open 61821; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61821-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61821-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-2RS bearing?", "a": "A 61821-2RS deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61821-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RS1 — two contact elastomer seals over a lifetime grease fill, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 2800 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-2RS." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61821-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61821-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 105, "D_mm": 130, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.8, "static_load_kN": 19.6, "fatigue_load_limit_kN": 1, "reference_speed_rpm": 10000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 330, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.", "RSR low-friction seals on 61821-RSR run faster than contact-seal 61821-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61821-2RS instead.", "The non-contact lip of 61821-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61821-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 5000 r/min limiting speed, closer to the open bearing's 10000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.8/19.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61821-RSR bearing?", "a": "A 61821-RSR deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61821 bore code work?", "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61821-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 105 mm bore?", "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61821-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61821-2RZ — two low-friction non-contact elastomer seals, 105×130×13 mm per ISO 15. Quoted values: C 20.8 kN, C0 19.6 kN, Pu 1 kN, limiting speed 5000 r/min, mass 330 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61821-RSR." } ], "cross_ref": [ { "equiv_sku": "61821-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×130×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61821-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822", "brand": "SKF", "manufacturer_designation": "SKF 61822", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 470, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "The open 61822 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×140×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61822 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822.", "The open 61822 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61822-2Z (shields) and 61822-2RSH (contact seals), not suffix-free 61822.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822 bearing?", "a": "A 61822 deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61822 mean?", "a": "A bare 61822 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822 — the open (unsealed) execution, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 5600 r/min, mass 470 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "Contact seals add drag and heat: 61822-2RS runs slower and cooler-limited than the open 61822; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61822-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61822-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 9500 r/min thermal reference speed.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-2RS bearing?", "a": "A 61822-2RS deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61822-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RS1 — two contact elastomer seals over a lifetime grease fill, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 2600 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-2RS." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61822-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61822-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 110, "D_mm": 140, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 28.1, "static_load_kN": 26, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 9500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.", "RSR low-friction seals on 61822-RSR run faster than contact-seal 61822-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61822-2RS instead.", "The non-contact lip of 61822-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822-RSR.", "SKF catalogues the low-friction seal as 61822-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4500 r/min limiting speed, closer to the open bearing's 9500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 28.1/26 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61822-RSR bearing?", "a": "A 61822-RSR deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61822 bore code work?", "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61822-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 110 mm bore?", "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61822-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61822-2RZ — two low-friction non-contact elastomer seals, 110×140×16 mm per ISO 15. Quoted values: C 28.1 kN, C0 26 kN, Pu 1.25 kN, limiting speed 4500 r/min, mass 600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61822-RSR." } ], "cross_ref": [ { "equiv_sku": "61822-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×140×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61822-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824", "brand": "SKF", "manufacturer_designation": "SKF 61824", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 5300, "max_rpm": 5300, "weight_g": 510, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "The open 61824 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-C3. No clearance suffix means normal CN clearance.", "The open 61824 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61824-2Z (shields) and 61824-2RSH (contact seals), not suffix-free 61824.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824 bearing?", "a": "A 61824 deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61824 mean?", "a": "A bare 61824 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824 — the open (unsealed) execution, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 5300 r/min, mass 510 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "Contact seals add drag and heat: 61824-2RS runs slower and cooler-limited than the open 61824; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61824-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61824-2RS.", "SKF catalogues the contact-sealed version as 61824-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8500 r/min thermal reference speed.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-2RS bearing?", "a": "A 61824-2RS deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61824-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 2400 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-2RS." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61824-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61824-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 120, "D_mm": 150, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.1, "static_load_kN": 28, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 8500, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.", "RSR low-friction seals on 61824-RSR run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.", "The non-contact lip of 61824-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61824-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 4300 r/min limiting speed, closer to the open bearing's 8500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.1/28 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61824-RSR bearing?", "a": "A 61824-RSR deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61824 bore code work?", "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61824-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 120 mm bore?", "a": "618 is an extra-thin section: 150×16 mm, only 15.0 mm radial section at 120 mm bore, far smaller than a 6224, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61824-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61824-2RZ — two low-friction non-contact elastomer seals, 120×150×16 mm per ISO 15. Quoted values: C 29.1 kN, C0 28 kN, Pu 1.29 kN, limiting speed 4300 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61824-RSR." } ], "cross_ref": [ { "equiv_sku": "61824-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×150×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61824-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826", "brand": "SKF", "manufacturer_designation": "SKF 61826", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "The open 61826 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61826 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61826 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61826-2Z (shields) and 61826-2RSH (contact seals), not suffix-free 61826.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826 bearing?", "a": "A 61826 deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61826 mean?", "a": "A bare 61826 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826 — the open (unsealed) execution, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 4800 r/min, mass 750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "Contact seals add drag and heat: 61826-2RS runs slower and cooler-limited than the open 61826; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61826-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61826-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61826-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2200 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 8000 r/min thermal reference speed.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-2RS bearing?", "a": "A 61826-2RS deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61826-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 2200 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-2RS." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61826-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61826-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 130, "D_mm": 165, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 37.7, "static_load_kN": 43, "fatigue_load_limit_kN": 1.6, "reference_speed_rpm": 8000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 930, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.", "RSR low-friction seals on 61826-RSR run faster than contact-seal 61826-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61826-2RS instead.", "The non-contact lip of 61826-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 130 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61826-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3800 r/min limiting speed, closer to the open bearing's 8000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 37.7/43 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61826-RSR bearing?", "a": "A 61826-RSR deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61826 bore code work?", "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61826-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 130 mm bore?", "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61826-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61826-2RZ — two low-friction non-contact elastomer seals, 130×165×18 mm per ISO 15. Quoted values: C 37.7 kN, C0 43 kN, Pu 1.6 kN, limiting speed 3800 r/min, mass 930 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61826-RSR." } ], "cross_ref": [ { "equiv_sku": "61826-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×165×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61826-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828", "brand": "SKF", "manufacturer_designation": "SKF 61828", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 820, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "The open 61828 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×175×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61828 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828.", "The open 61828 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61828-2Z (shields) and 61828-2RSH (contact seals), not suffix-free 61828.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828 bearing?", "a": "A 61828 deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61828 mean?", "a": "A bare 61828 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828 — the open (unsealed) execution, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 4500 r/min, mass 820 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RS1", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "Contact seals add drag and heat: 61828-2RS runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61828-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61828-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 2000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 7500 r/min thermal reference speed.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-2RS bearing?", "a": "A 61828-2RS deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61828-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RS1 — two contact elastomer seals over a lifetime grease fill, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 2000 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-2RS." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61828-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61828-2RZ", "series": "61800-series", "type": "deep_groove", "d_mm": 140, "D_mm": 175, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 39, "static_load_kN": 46.5, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 7500, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 990, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61828 carries bore code 28 = 140 mm. Outside diameter 175 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.", "RSR low-friction seals on 61828-RSR run faster than contact-seal 61828-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61828-2RS instead.", "The non-contact lip of 61828-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828-RSR.", "SKF catalogues the low-friction seal as 61828-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 3600 r/min limiting speed, closer to the open bearing's 7500 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 39/46.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61828-RSR bearing?", "a": "A 61828-RSR deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61828 bore code work?", "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61828-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61800 compare with other series at the same 140 mm bore?", "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61828-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61828-2RZ — two low-friction non-contact elastomer seals, 140×175×18 mm per ISO 15. Quoted values: C 39 kN, C0 46.5 kN, Pu 1.66 kN, limiting speed 3600 r/min, mass 990 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61828-RSR." } ], "cross_ref": [ { "equiv_sku": "61828-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×175×18 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61828-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61830", "brand": "SKF", "manufacturer_designation": "SKF 61830", "series": "61800-series", "type": "deep_groove", "d_mm": 150, "D_mm": 190, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 48.8, "static_load_kN": 61, "fatigue_load_limit_kN": 1.96, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.", "The open 61830 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61830-C3. No clearance suffix means normal CN clearance.", "The open 61830 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61830-2Z (shields) and 61830-2RSH (contact seals), not suffix-free 61830.", "The 48.8/61 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61830 bearing?", "a": "A 61830 deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61830 bore code work?", "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61830 mean?", "a": "A bare 61830 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 150 mm bore?", "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61830?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61830 — the open (unsealed) execution, 150×190×20 mm per ISO 15. Quoted values: C 48.8 kN, C0 61 kN, Pu 1.96 kN, limiting speed 4300 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61830." } ], "cross_ref": [ { "equiv_sku": "61830", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61832", "brand": "SKF", "manufacturer_designation": "SKF 61832", "series": "61800-series", "type": "deep_groove", "d_mm": 160, "D_mm": 200, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 49.4, "static_load_kN": 64, "fatigue_load_limit_kN": 2, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 1250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.", "The open 61832 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61832 units.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61832 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61832-2Z (shields) and 61832-2RSH (contact seals), not suffix-free 61832.", "The 49.4/64 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61832 bearing?", "a": "A 61832 deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61832 bore code work?", "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61832 mean?", "a": "A bare 61832 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 160 mm bore?", "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61832?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61832 — the open (unsealed) execution, 160×200×20 mm per ISO 15. Quoted values: C 49.4 kN, C0 64 kN, Pu 2 kN, limiting speed 4000 r/min, mass 1250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61832." } ], "cross_ref": [ { "equiv_sku": "61832", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61834", "brand": "SKF", "manufacturer_designation": "SKF 61834", "series": "61800-series", "type": "deep_groove", "d_mm": 170, "D_mm": 215, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 61.8, "static_load_kN": 78, "fatigue_load_limit_kN": 2.4, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 1650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.", "The open 61834 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834.", "The open 61834 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61834-2Z (shields) and 61834-2RSH (contact seals), not suffix-free 61834.", "The 61.8/78 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61834 bearing?", "a": "A 61834 deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61834 bore code work?", "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61834 mean?", "a": "A bare 61834 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 170 mm bore?", "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61834?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61834 — the open (unsealed) execution, 170×215×22 mm per ISO 15. Quoted values: C 61.8 kN, C0 78 kN, Pu 2.4 kN, limiting speed 3600 r/min, mass 1650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61834." } ], "cross_ref": [ { "equiv_sku": "61834", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61836", "brand": "SKF", "manufacturer_designation": "SKF 61836", "series": "61800-series", "type": "deep_groove", "d_mm": 180, "D_mm": 225, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 62.4, "static_load_kN": 81.5, "fatigue_load_limit_kN": 2.45, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 1750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.", "The open 61836 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×225×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61836-C3. No clearance suffix means normal CN clearance.", "The open 61836 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61836-2Z (shields) and 61836-2RSH (contact seals), not suffix-free 61836.", "The 62.4/81.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61836 bearing?", "a": "A 61836 deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61836 bore code work?", "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61836 mean?", "a": "A bare 61836 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 180 mm bore?", "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61836?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61836 — the open (unsealed) execution, 180×225×22 mm per ISO 15. Quoted values: C 62.4 kN, C0 81.5 kN, Pu 2.45 kN, limiting speed 3400 r/min, mass 1750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61836." } ], "cross_ref": [ { "equiv_sku": "61836", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61838", "brand": "SKF", "manufacturer_designation": "SKF 61838", "series": "61800-series", "type": "deep_groove", "d_mm": 190, "D_mm": 240, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 98, "fatigue_load_limit_kN": 2.8, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.", "The open 61838 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×240×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61838 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61838-2Z (shields) and 61838-2RSH (contact seals), not suffix-free 61838.", "The 76.1/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61838 bearing?", "a": "A 61838 deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61838 bore code work?", "a": "The last two digits of 61838 are bore code 38, giving 38 × 5 = 190 mm bore. The 240 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61838 mean?", "a": "A bare 61838 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 190 mm bore?", "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61838?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61838 — the open (unsealed) execution, 190×240×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 98 kN, Pu 2.8 kN, limiting speed 3200 r/min, mass 2250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61838." } ], "cross_ref": [ { "equiv_sku": "61838", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61840", "brand": "SKF", "manufacturer_designation": "SKF 61840", "series": "61800-series", "type": "deep_groove", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.1, "static_load_kN": 102, "fatigue_load_limit_kN": 2.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 2350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 200 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6240.", "The open 61840 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×250×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61840 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61840.", "The open 61840 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61840-2Z (shields) and 61840-2RSH (contact seals), not suffix-free 61840.", "The 76.1/102 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61840 bearing?", "a": "A 61840 deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61840 bore code work?", "a": "The last two digits of 61840 are bore code 40, giving 40 × 5 = 200 mm bore. The 250 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61840 mean?", "a": "A bare 61840 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 200 mm bore?", "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61840?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61840 — the open (unsealed) execution, 200×250×24 mm per ISO 15. Quoted values: C 76.1 kN, C0 102 kN, Pu 2.9 kN, limiting speed 3200 r/min, mass 2350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61840." } ], "cross_ref": [ { "equiv_sku": "61840", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61844", "brand": "SKF", "manufacturer_designation": "SKF 61844", "series": "61800-series", "type": "deep_groove", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 78, "static_load_kN": 110, "fatigue_load_limit_kN": 3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 2550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.", "The open 61844 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.", "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61844 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61844-2Z (shields) and 61844-2RSH (contact seals), not suffix-free 61844.", "The 78/110 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61844 bearing?", "a": "A 61844 deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61844 bore code work?", "a": "The last two digits of 61844 are bore code 44, giving 44 × 5 = 220 mm bore. The 270 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61844 mean?", "a": "A bare 61844 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 220 mm bore?", "a": "618 is an extra-thin section: 270×24 mm, only 25.0 mm radial section at 220 mm bore, far smaller than a 6244, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61844?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61844 — the open (unsealed) execution, 220×270×24 mm per ISO 15. Quoted values: C 78 kN, C0 110 kN, Pu 3 kN, limiting speed 2800 r/min, mass 2550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61844." } ], "cross_ref": [ { "equiv_sku": "61844", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61848", "brand": "SKF", "manufacturer_designation": "SKF 61848", "series": "61800-series", "type": "deep_groove", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 108, "static_load_kN": 150, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 3900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.", "The open 61848 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61848 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61848-C3. No clearance suffix means normal CN clearance.", "The open 61848 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61848-2Z (shields) and 61848-2RSH (contact seals), not suffix-free 61848.", "The 108/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61848 bearing?", "a": "A 61848 deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61848 bore code work?", "a": "The last two digits of 61848 are bore code 48, giving 48 × 5 = 240 mm bore. The 300 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61848 mean?", "a": "A bare 61848 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 240 mm bore?", "a": "618 is an extra-thin section: 300×28 mm, only 30.0 mm radial section at 240 mm bore, far smaller than a 6248, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61848?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61848 — the open (unsealed) execution, 240×300×28 mm per ISO 15. Quoted values: C 108 kN, C0 150 kN, Pu 3.8 kN, limiting speed 2600 r/min, mass 3900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61848." } ], "cross_ref": [ { "equiv_sku": "61848", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61852", "brand": "SKF", "manufacturer_designation": "SKF 61852", "series": "61800-series", "type": "deep_groove", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 163, "fatigue_load_limit_kN": 4, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 4150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 260 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6252.", "The open 61852 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×320×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61852.", "The open 61852 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61852-2Z (shields) and 61852-2RSH (contact seals), not suffix-free 61852.", "The 111/163 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61852 bearing?", "a": "A 61852 deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61852 bore code work?", "a": "The last two digits of 61852 are bore code 52, giving 52 × 5 = 260 mm bore. The 320 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61852 mean?", "a": "A bare 61852 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 260 mm bore?", "a": "618 is an extra-thin section: 320×28 mm, only 30.0 mm radial section at 260 mm bore, far smaller than a 6252, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61852?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61852 — the open (unsealed) execution, 260×320×28 mm per ISO 15. Quoted values: C 111 kN, C0 163 kN, Pu 4 kN, limiting speed 2400 r/min, mass 4150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61852." } ], "cross_ref": [ { "equiv_sku": "61852", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61856", "brand": "SKF", "manufacturer_designation": "SKF 61856", "series": "61800-series", "type": "deep_groove", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 138, "static_load_kN": 200, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 6250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61856 carries bore code 56 = 280 mm. Outside diameter 350 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 280 mm bore has only a 35.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6256.", "The open 61856 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×350×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61856 units.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61856 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61856-2Z (shields) and 61856-2RSH (contact seals), not suffix-free 61856.", "The 138/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61856 bearing?", "a": "A 61856 deep-groove ball bearing has a 280 mm bore, 350 mm outer diameter and 33 mm width (11.024 × 13.78 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61856 bore code work?", "a": "The last two digits of 61856 are bore code 56, giving 56 × 5 = 280 mm bore. The 350 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61856 mean?", "a": "A bare 61856 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 280 mm bore?", "a": "618 is an extra-thin section: 350×33 mm, only 35.0 mm radial section at 280 mm bore, far smaller than a 6256, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61856?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61856 — the open (unsealed) execution, 280×350×33 mm per ISO 15. Quoted values: C 138 kN, C0 200 kN, Pu 4.75 kN, limiting speed 2200 r/min, mass 6250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61856." } ], "cross_ref": [ { "equiv_sku": "61856", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61860", "brand": "SKF", "manufacturer_designation": "SKF 61860", "series": "61800-series", "type": "deep_groove", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 245, "fatigue_load_limit_kN": 5.6, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 8900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61860 carries bore code 60 = 300 mm. Outside diameter 380 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 300 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6260.", "The open 61860 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×380×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61860 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61860-C3. No clearance suffix means normal CN clearance.", "The open 61860 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61860-2Z (shields) and 61860-2RSH (contact seals), not suffix-free 61860.", "The 172/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61860 bearing?", "a": "A 61860 deep-groove ball bearing has a 300 mm bore, 380 mm outer diameter and 38 mm width (11.811 × 14.961 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61860 bore code work?", "a": "The last two digits of 61860 are bore code 60, giving 60 × 5 = 300 mm bore. The 380 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61860 mean?", "a": "A bare 61860 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 300 mm bore?", "a": "618 is an extra-thin section: 380×38 mm, only 40.0 mm radial section at 300 mm bore, far smaller than a 6260, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61860?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61860 — the open (unsealed) execution, 300×380×38 mm per ISO 15. Quoted values: C 172 kN, C0 245 kN, Pu 5.6 kN, limiting speed 2000 r/min, mass 8900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61860." } ], "cross_ref": [ { "equiv_sku": "61860", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61864", "brand": "SKF", "manufacturer_designation": "SKF 61864", "series": "61800-series", "type": "deep_groove", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 172, "static_load_kN": 255, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 9500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61864 carries bore code 64 = 320 mm. Outside diameter 400 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 320 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 320 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 320 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6264.", "The open 61864 has no lubricant retention: grease escapes and contaminants migrate straight into the 320×400×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61864 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 400 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61864.", "The open 61864 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61864-2Z (shields) and 61864-2RSH (contact seals), not suffix-free 61864.", "The 172/255 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61864 bearing?", "a": "A 61864 deep-groove ball bearing has a 320 mm bore, 400 mm outer diameter and 38 mm width (12.598 × 15.748 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61864 bore code work?", "a": "The last two digits of 61864 are bore code 64, giving 64 × 5 = 320 mm bore. The 400 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61864 mean?", "a": "A bare 61864 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 320 mm bore?", "a": "618 is an extra-thin section: 400×38 mm, only 40.0 mm radial section at 320 mm bore, far smaller than a 6264, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61864?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61864 — the open (unsealed) execution, 320×400×38 mm per ISO 15. Quoted values: C 172 kN, C0 255 kN, Pu 5.7 kN, limiting speed 1900 r/min, mass 9500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61864." } ], "cross_ref": [ { "equiv_sku": "61864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61868", "brand": "SKF", "manufacturer_designation": "SKF 61868", "series": "61800-series", "type": "deep_groove", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 178, "static_load_kN": 275, "fatigue_load_limit_kN": 6, "reference_speed_rpm": 2800, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (ISO 15 diameter series 8) the last two digits encode the bore: 61868 carries bore code 68 = 340 mm. Outside diameter 420 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 340 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 340 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 618xx thin section at 340 mm bore has only a 40.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6268.", "The open 61868 has no lubricant retention: grease escapes and contaminants migrate straight into the 340×420×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61868 units.", "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61868 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61868-2Z (shields) and 61868-2RSH (contact seals), not suffix-free 61868.", "The 178/275 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61868 bearing?", "a": "A 61868 deep-groove ball bearing has a 340 mm bore, 420 mm outer diameter and 38 mm width (13.386 × 16.535 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61868 bore code work?", "a": "The last two digits of 61868 are bore code 68, giving 68 × 5 = 340 mm bore. The 420 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61868 mean?", "a": "A bare 61868 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 340 mm bore?", "a": "618 is an extra-thin section: 420×38 mm, only 40.0 mm radial section at 340 mm bore, far smaller than a 6268, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the SKF designation and catalogue data for 61868?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61868 — the open (unsealed) execution, 340×420×38 mm per ISO 15. Quoted values: C 178 kN, C0 275 kN, Pu 6 kN, limiting speed 1800 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61868." } ], "cross_ref": [ { "equiv_sku": "61868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900", "brand": "SKF", "manufacturer_designation": "SKF 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 45000, "max_rpm": 45000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61900 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×22×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61900 units.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61900 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61900-2Z (shields) and 61900-2RSH (contact seals), not suffix-free 61900.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900 bearing?", "a": "A 61900 deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61900 mean?", "a": "A bare 61900 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900 — the open (unsealed) execution, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 45000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61900-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61900-2RS runs slower and cooler-limited than the open 61900; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61900-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61900-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 20000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 70000 r/min thermal reference speed.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-2RS bearing?", "a": "A 61900-2RS deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61900-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2RS1 — two contact elastomer seals over a lifetime grease fill, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 20000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-2RS." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61900-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "fatigue_load_limit_kN": 0.054, "reference_speed_rpm": 70000, "limiting_speed_rpm": 36000, "max_rpm": 36000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61900 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61900 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61900-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61900-2RS for that.", "Shielded 61900-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF spells the shielded version 61900-2Z (one shield: 61900-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.7/1.27 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61900-ZZ bearing?", "a": "A 61900-ZZ deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61900 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61900 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61900-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 10 mm bore?", "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6200 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61900-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61900-2Z — two non-contact sheet-metal shields, 10×22×6 mm per ISO 15. Quoted values: C 2.7 kN, C0 1.27 kN, Pu 0.054 kN, limiting speed 36000 r/min, mass 10 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61900-ZZ." } ], "cross_ref": [ { "equiv_sku": "61900", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61900-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901", "brand": "SKF", "manufacturer_designation": "SKF 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 40000, "max_rpm": 40000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61901 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×24×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61901 units.", "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61901 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61901-2Z (shields) and 61901-2RSH (contact seals), not suffix-free 61901.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901 bearing?", "a": "A 61901 deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61901 mean?", "a": "A bare 61901 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901 — the open (unsealed) execution, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 40000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61901-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61901-2RS runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61901-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61901-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61901-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 19000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 67000 r/min thermal reference speed.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-2RS bearing?", "a": "A 61901-2RS deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61901-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2RS1 — two contact elastomer seals over a lifetime grease fill, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 19000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-2RS." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61901-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2.91, "static_load_kN": 1.46, "fatigue_load_limit_kN": 0.062, "reference_speed_rpm": 67000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 11, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61901 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61901 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61901-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61901-2RS for that.", "Shielded 61901-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-ZZ.", "SKF spells the shielded version 61901-2Z (one shield: 61901-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 2.91/1.46 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61901-ZZ bearing?", "a": "A 61901-ZZ deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61901 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61901 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61901-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6201 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61901-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61901-2Z — two non-contact sheet-metal shields, 12×24×6 mm per ISO 15. Quoted values: C 2.91 kN, C0 1.46 kN, Pu 0.062 kN, limiting speed 32000 r/min, mass 11 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61901-ZZ." } ], "cross_ref": [ { "equiv_sku": "61901", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61901-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902", "brand": "SKF", "manufacturer_designation": "SKF 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 34000, "max_rpm": 34000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61902 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61902 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61902 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61902-2Z (shields) and 61902-2RSH (contact seals), not suffix-free 61902.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902 bearing?", "a": "A 61902 deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61902 mean?", "a": "A bare 61902 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902 — the open (unsealed) execution, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 34000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61902-2RS runs slower and cooler-limited than the open 61902; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61902-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61902-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 16000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 56000 r/min thermal reference speed.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-2RS bearing?", "a": "A 61902-2RS deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61902-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RS1 — two contact elastomer seals over a lifetime grease fill, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 16000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-2RS." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61902-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61902-RSR run faster than contact-seal 61902-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61902-2RS instead.", "The non-contact lip of 61902-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61902-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-RSR bearing?", "a": "A 61902-RSR deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61902-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2RZ — two low-friction non-contact elastomer seals, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-RSR." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61902-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.36, "static_load_kN": 2.24, "fatigue_load_limit_kN": 0.095, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61902 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61902-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.", "Shielded 61902-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 61902-2Z (one shield: 61902-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.36/2.24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61902-ZZ bearing?", "a": "A 61902-ZZ deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61902 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61902 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61902-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6202 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61902-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61902-2Z — two non-contact sheet-metal shields, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-ZZ." } ], "cross_ref": [ { "equiv_sku": "61902", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61902-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903", "brand": "SKF", "manufacturer_designation": "SKF 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 32000, "max_rpm": 32000, "weight_g": 16, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61903 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×30×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61903 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903.", "The open 61903 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61903-2Z (shields) and 61903-2RSH (contact seals), not suffix-free 61903.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903 bearing?", "a": "A 61903 deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 61903 mean?", "a": "A bare 61903 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903 — the open (unsealed) execution, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 32000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61903-2RS runs slower and cooler-limited than the open 61903; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61903-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61903-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 14000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 50000 r/min thermal reference speed.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-2RS bearing?", "a": "A 61903-2RS deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the 2RS suffix on 61903-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RS1 — two contact elastomer seals over a lifetime grease fill, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 14000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-2RS." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61903-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61903-RSR run faster than contact-seal 61903-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61903-2RS instead.", "The non-contact lip of 61903-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61903-RSR.", "SKF catalogues the low-friction seal as 61903-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-RSR bearing?", "a": "A 61903-RSR deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 61903-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2RZ — two low-friction non-contact elastomer seals, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 18 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-RSR." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61903-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4.62, "static_load_kN": 2.55, "fatigue_load_limit_kN": 0.108, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61903 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 61903 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61903-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61903-2RS for that.", "Shielded 61903-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61903-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 61903-2Z (one shield: 61903-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The 4.62/2.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61903-ZZ bearing?", "a": "A 61903-ZZ deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Why does 61903 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 61903 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the ZZ suffix on 61903-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 17 mm bore?", "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6203 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61903-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61903-2Z — two non-contact sheet-metal shields, 17×30×7 mm per ISO 15. Quoted values: C 4.62 kN, C0 2.55 kN, Pu 0.108 kN, limiting speed 26000 r/min, mass 17 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61903-ZZ." } ], "cross_ref": [ { "equiv_sku": "61903", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61903-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61904-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61904-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 20, "D_mm": 37, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 6.37, "static_load_kN": 3.65, "fatigue_load_limit_kN": 0.156, "reference_speed_rpm": 43000, "limiting_speed_rpm": 20000, "max_rpm": 20000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61904-RSR run faster than contact-seal 61904-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61904-2RS instead.", "The non-contact lip of 61904-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61904-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 20000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 6.37/3.65 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61904-RSR bearing?", "a": "A 61904-RSR deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61904 bore code work?", "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61904-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 20 mm bore?", "a": "619 is a thin section one step above 618: 37×9 mm with a 8.5 mm radial section at 20 mm bore; a 6204 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61904-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61904-2RZ — two low-friction non-contact elastomer seals, 20×37×9 mm per ISO 15. Quoted values: C 6.37 kN, C0 3.65 kN, Pu 0.156 kN, limiting speed 20000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61904-RSR." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 20×37×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71904", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61904-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61905-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61905-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 25, "D_mm": 42, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.02, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.193, "reference_speed_rpm": 36000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 45, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61905-RSR run faster than contact-seal 61905-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61905-2RS instead.", "The non-contact lip of 61905-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61905-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 18000 r/min limiting speed, closer to the open bearing's 36000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.02/4.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61905-RSR bearing?", "a": "A 61905-RSR deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61905 bore code work?", "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61905-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 25 mm bore?", "a": "619 is a thin section one step above 618: 42×9 mm with a 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61905-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61905-2RZ — two low-friction non-contact elastomer seals, 25×42×9 mm per ISO 15. Quoted values: C 7.02 kN, C0 4.3 kN, Pu 0.193 kN, limiting speed 18000 r/min, mass 45 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61905-RSR." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 25×42×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71905", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61905-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61906-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61906-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 30, "D_mm": 47, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 4.55, "fatigue_load_limit_kN": 0.212, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 51, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61906-RSR run faster than contact-seal 61906-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61906-2RS instead.", "The non-contact lip of 61906-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61906-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/4.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61906-RSR bearing?", "a": "A 61906-RSR deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61906 bore code work?", "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61906-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 30 mm bore?", "a": "619 is a thin section one step above 618: 47×9 mm with a 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61906-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61906-2RZ — two low-friction non-contact elastomer seals, 30×47×9 mm per ISO 15. Quoted values: C 7.28 kN, C0 4.55 kN, Pu 0.212 kN, limiting speed 15000 r/min, mass 51 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61906-RSR." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 30×47×9 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71906", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61906-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61907-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61907-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 35, "D_mm": 55, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.325, "reference_speed_rpm": 26000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 80, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61907-RSR run faster than contact-seal 61907-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61907-2RS instead.", "The non-contact lip of 61907-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61907-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 26000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61907-RSR bearing?", "a": "A 61907-RSR deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61907 bore code work?", "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61907-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 35 mm bore?", "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61907-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61907-2RZ — two low-friction non-contact elastomer seals, 35×55×10 mm per ISO 15. Quoted values: C 10.8 kN, C0 7.8 kN, Pu 0.325 kN, limiting speed 13000 r/min, mass 80 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61907-RSR." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 35×55×10 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71907", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61907-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61908-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61908-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 40, "D_mm": 62, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.8, "static_load_kN": 10, "fatigue_load_limit_kN": 0.425, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61908-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61908-RSR run faster than contact-seal 61908-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61908-2RS instead.", "The non-contact lip of 61908-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61908-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.8/10 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61908-RSR bearing?", "a": "A 61908-RSR deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61908 bore code work?", "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61908-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 40 mm bore?", "a": "619 is a thin section one step above 618: 62×12 mm with a 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61908-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61908-2RZ — two low-friction non-contact elastomer seals, 40×62×12 mm per ISO 15. Quoted values: C 13.8 kN, C0 10 kN, Pu 0.425 kN, limiting speed 12000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61908-RSR." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 40×62×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71908", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61908-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61909-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61909-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 45, "D_mm": 68, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.465, "reference_speed_rpm": 20000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61909-RSR run faster than contact-seal 61909-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61909-2RS instead.", "The non-contact lip of 61909-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61909-RSR.", "SKF catalogues the low-friction seal as 61909-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61909-RSR bearing?", "a": "A 61909-RSR deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61909 bore code work?", "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61909-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 45 mm bore?", "a": "619 is a thin section one step above 618: 68×12 mm with a 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61909-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61909-2RZ — two low-friction non-contact elastomer seals, 45×68×12 mm per ISO 15. Quoted values: C 14 kN, C0 10.8 kN, Pu 0.465 kN, limiting speed 10000 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61909-RSR." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 45×68×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71909", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61909-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61910-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61910-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 50, "D_mm": 72, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.6, "static_load_kN": 11.8, "fatigue_load_limit_kN": 0.5, "reference_speed_rpm": 19000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 140, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.", "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61910-RSR run faster than contact-seal 61910-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61910-2RS instead.", "The non-contact lip of 61910-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61910-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9500 r/min limiting speed, closer to the open bearing's 19000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.6/11.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61910-RSR bearing?", "a": "A 61910-RSR deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61910 bore code work?", "a": "The last two digits of 61910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61910-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 50 mm bore?", "a": "619 is a thin section one step above 618: 72×12 mm with a 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61910-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61910-2RZ — two low-friction non-contact elastomer seals, 50×72×12 mm per ISO 15. Quoted values: C 14.6 kN, C0 11.8 kN, Pu 0.5 kN, limiting speed 9500 r/min, mass 140 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61910-RSR." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 50×72×12 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71910", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61910-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61911-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61911-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 55, "D_mm": 80, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 190, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61911-RSR run faster than contact-seal 61911-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61911-2RS instead.", "The non-contact lip of 61911-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 61911-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61911-RSR bearing?", "a": "A 61911-RSR deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61911 bore code work?", "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61911-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 55 mm bore?", "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61911-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61911-2RZ — two low-friction non-contact elastomer seals, 55×80×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14 kN, Pu 0.6 kN, limiting speed 8500 r/min, mass 190 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61911-RSR." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 55×80×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71911", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61911-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912", "brand": "SKF", "manufacturer_designation": "SKF 61912", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61912 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61912 units.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61912 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61912-2Z (shields) and 61912-2RSH (contact seals), not suffix-free 61912.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912 bearing?", "a": "A 61912 deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61912 mean?", "a": "A bare 61912 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912 — the open (unsealed) execution, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 10000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 12, "fatigue_load_limit_kN": 0.6, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 210, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61912-2RS runs slower and cooler-limited than the open 61912; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61912-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the contact-sealed version as 61912-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 16000 r/min thermal reference speed.", "The 16.5/12 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-2RS bearing?", "a": "A 61912-2RS deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61912-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RS1 — two contact elastomer seals over a lifetime grease fill, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 12 kN, Pu 0.6 kN, limiting speed 4500 r/min, mass 210 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-2RS." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61912-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61912-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61912-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 60, "D_mm": 85, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 16.5, "static_load_kN": 14.3, "fatigue_load_limit_kN": 0.6, "reference_speed_rpm": 16000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61912-RSR run faster than contact-seal 61912-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61912-2RS instead.", "The non-contact lip of 61912-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.", "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 61912-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8000 r/min limiting speed, closer to the open bearing's 16000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 16.5/14.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61912-RSR bearing?", "a": "A 61912-RSR deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61912 bore code work?", "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61912-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 60 mm bore?", "a": "619 is a thin section one step above 618: 85×13 mm with a 12.5 mm radial section at 60 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61912-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61912-2RZ — two low-friction non-contact elastomer seals, 60×85×13 mm per ISO 15. Quoted values: C 16.5 kN, C0 14.3 kN, Pu 0.6 kN, limiting speed 8000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61912-RSR." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 60×85×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71912", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61912-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913", "brand": "SKF", "manufacturer_designation": "SKF 61913", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 9500, "max_rpm": 9500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61913 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×90×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61913 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61913-2Z (shields) and 61913-2RSH (contact seals), not suffix-free 61913.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913 bearing?", "a": "A 61913 deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61913 mean?", "a": "A bare 61913 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913 — the open (unsealed) execution, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 9500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61913-2RS runs slower and cooler-limited than the open 61913; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61913-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61913-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4300 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 15000 r/min thermal reference speed.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-2RS bearing?", "a": "A 61913-2RS deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61913-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RS1 — two contact elastomer seals over a lifetime grease fill, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 4300 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-2RS." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61913-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61913-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 65, "D_mm": 90, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.4, "static_load_kN": 16, "fatigue_load_limit_kN": 0.68, "reference_speed_rpm": 15000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 220, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.", "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61913-RSR run faster than contact-seal 61913-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61913-2RS instead.", "The non-contact lip of 61913-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 61913-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7500 r/min limiting speed, closer to the open bearing's 15000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 17.4/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61913-RSR bearing?", "a": "A 61913-RSR deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61913 bore code work?", "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61913-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 65 mm bore?", "a": "619 is a thin section one step above 618: 90×13 mm with a 12.5 mm radial section at 65 mm bore; a 6213 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61913-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61913-2RZ — two low-friction non-contact elastomer seals, 65×90×13 mm per ISO 15. Quoted values: C 17.4 kN, C0 16 kN, Pu 0.68 kN, limiting speed 7500 r/min, mass 220 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61913-RSR." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 65×90×13 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71913", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61913-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914", "brand": "SKF", "manufacturer_designation": "SKF 61914", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 18.3, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 340, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61914 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61914 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61914-2Z (shields) and 61914-2RSH (contact seals), not suffix-free 61914.", "The 23.8/18.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914 bearing?", "a": "A 61914 deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61914 mean?", "a": "A bare 61914 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914 — the open (unsealed) execution, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 18.3 kN, Pu 0.9 kN, limiting speed 8500 r/min, mass 340 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61914-2RS runs slower and cooler-limited than the open 61914; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61914-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 61914-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 4000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 14000 r/min thermal reference speed.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-2RS bearing?", "a": "A 61914-2RS deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61914-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RS1 — two contact elastomer seals over a lifetime grease fill, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 4000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-2RS." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61914-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61914-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 70, "D_mm": 100, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.8, "static_load_kN": 21.2, "fatigue_load_limit_kN": 0.9, "reference_speed_rpm": 14000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61914-RSR run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.", "The non-contact lip of 61914-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 61914-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 7000 r/min limiting speed, closer to the open bearing's 14000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.8/21.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61914-RSR bearing?", "a": "A 61914-RSR deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61914 bore code work?", "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61914-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 70 mm bore?", "a": "619 is a thin section one step above 618: 100×16 mm with a 15.0 mm radial section at 70 mm bore; a 6214 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61914-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61914-2RZ — two low-friction non-contact elastomer seals, 70×100×16 mm per ISO 15. Quoted values: C 23.8 kN, C0 21.2 kN, Pu 0.9 kN, limiting speed 7000 r/min, mass 350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61914-RSR." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 70×100×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71914", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61914-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915", "brand": "SKF", "manufacturer_designation": "SKF 61915", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 19.3, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61915 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×105×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61915 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915.", "The open 61915 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61915-2Z (shields) and 61915-2RSH (contact seals), not suffix-free 61915.", "The 24.2/19.3 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915 bearing?", "a": "A 61915 deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61915 mean?", "a": "A bare 61915 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915 — the open (unsealed) execution, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 19.3 kN, Pu 0.965 kN, limiting speed 8000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61915-2RS runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61915-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 61915-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3600 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 13000 r/min thermal reference speed.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-2RS bearing?", "a": "A 61915-2RS deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61915-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RS1 — two contact elastomer seals over a lifetime grease fill, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 3600 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-2RS." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61915-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61915-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 75, "D_mm": 105, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 24.2, "static_load_kN": 22.4, "fatigue_load_limit_kN": 0.965, "reference_speed_rpm": 13000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 370, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.", "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61915-RSR run faster than contact-seal 61915-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61915-2RS instead.", "The non-contact lip of 61915-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 105 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61915-RSR.", "SKF catalogues the low-friction seal as 61915-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6300 r/min limiting speed, closer to the open bearing's 13000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 24.2/22.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61915-RSR bearing?", "a": "A 61915-RSR deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61915 bore code work?", "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61915-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 75 mm bore?", "a": "619 is a thin section one step above 618: 105×16 mm with a 15.0 mm radial section at 75 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61915-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61915-2RZ — two low-friction non-contact elastomer seals, 75×105×16 mm per ISO 15. Quoted values: C 24.2 kN, C0 22.4 kN, Pu 0.965 kN, limiting speed 6300 r/min, mass 370 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61915-RSR." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 75×105×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71915", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "61915-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916", "brand": "SKF", "manufacturer_designation": "SKF 61916", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61916 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×110×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61916 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61916 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61916-2Z (shields) and 61916-2RSH (contact seals), not suffix-free 61916.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916 bearing?", "a": "A 61916 deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61916 mean?", "a": "A bare 61916 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916 — the open (unsealed) execution, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 7500 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61916-2RS runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61916-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 61916-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3400 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 12000 r/min thermal reference speed.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-2RS bearing?", "a": "A 61916-2RS deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61916-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RS1 — two contact elastomer seals over a lifetime grease fill, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 3400 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-2RS." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61916-RSR", "brand": "SKF", "manufacturer_designation": "SKF 61916-2RZ", "series": "61900-series", "type": "deep_groove", "d_mm": 80, "D_mm": 110, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 25.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 12000, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 400, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "RSR low-friction seals on 61916-RSR run faster than contact-seal 61916-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61916-2RS instead.", "The non-contact lip of 61916-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 61916-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 6000 r/min limiting speed, closer to the open bearing's 12000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 25.1/20.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61916-RSR bearing?", "a": "A 61916-RSR deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 61916 bore code work?", "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 61916-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 61900 compare with other series at the same 80 mm bore?", "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61916-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61916-2RZ — two low-friction non-contact elastomer seals, 80×110×16 mm per ISO 15. Quoted values: C 25.1 kN, C0 20.4 kN, Pu 1.02 kN, limiting speed 6000 r/min, mass 400 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61916-RSR." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 80×110×16 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71916", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "61916-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "61917", "brand": "SKF", "manufacturer_designation": "SKF 61917", "series": "61900-series", "type": "deep_groove", "d_mm": 85, "D_mm": 120, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 31.9, "static_load_kN": 30, "fatigue_load_limit_kN": 1.25, "reference_speed_rpm": 11000, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 550, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61917 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×120×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61917 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-C3. No clearance suffix means normal CN clearance.", "The open 61917 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61917-2Z (shields) and 61917-2RSH (contact seals), not suffix-free 61917.", "The 31.9/30 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61917 bearing?", "a": "A 61917 deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61917 bore code work?", "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61917 mean?", "a": "A bare 61917 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 85 mm bore?", "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61917?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61917 — the open (unsealed) execution, 85×120×18 mm per ISO 15. Quoted values: C 31.9 kN, C0 30 kN, Pu 1.25 kN, limiting speed 7000 r/min, mass 550 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61917." } ], "cross_ref": [ { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 85×120×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71917", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61918", "brand": "SKF", "manufacturer_designation": "SKF 61918", "series": "61900-series", "type": "deep_groove", "d_mm": 90, "D_mm": 125, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.2, "static_load_kN": 31.5, "fatigue_load_limit_kN": 1.29, "reference_speed_rpm": 11000, "limiting_speed_rpm": 6700, "max_rpm": 6700, "weight_g": 590, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61918 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×125×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61918 units.", "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61918 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61918-2Z (shields) and 61918-2RSH (contact seals), not suffix-free 61918.", "The 33.2/31.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61918 bearing?", "a": "A 61918 deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61918 bore code work?", "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61918 mean?", "a": "A bare 61918 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 90 mm bore?", "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61918?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61918 — the open (unsealed) execution, 90×125×18 mm per ISO 15. Quoted values: C 33.2 kN, C0 31.5 kN, Pu 1.29 kN, limiting speed 6700 r/min, mass 590 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61918." } ], "cross_ref": [ { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 90×125×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71918", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919", "brand": "SKF", "manufacturer_designation": "SKF 61919", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "reference_speed_rpm": 10000, "limiting_speed_rpm": 6300, "max_rpm": 6300, "weight_g": 610, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61919 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61919 units.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61919 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61919-2Z (shields) and 61919-2RSH (contact seals), not suffix-free 61919.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919 bearing?", "a": "A 61919 deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61919 mean?", "a": "A bare 61919 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61919?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919 — the open (unsealed) execution, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 6300 r/min, mass 610 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919." } ], "cross_ref": [ { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61919-2RS", "brand": "SKF", "manufacturer_designation": "SKF 61919-2RS1", "series": "61900-series", "type": "deep_groove", "d_mm": 95, "D_mm": 130, "B_mm": 18, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 33.8, "static_load_kN": 33.5, "fatigue_load_limit_kN": 1.34, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (17.5 mm section height at 95 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61919-2RS runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61919-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61919-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the contact-sealed version as 61919-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 3000 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 10000 r/min thermal reference speed.", "The 33.8/33.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61919-2RS bearing?", "a": "A 61919-2RS deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 61919 bore code work?", "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 61919-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 61900 compare with other series at the same 95 mm bore?", "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61919-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61919-2RS1 — two contact elastomer seals over a lifetime grease fill, 95×130×18 mm per ISO 15. Quoted values: C 33.8 kN, C0 33.5 kN, Pu 1.34 kN, limiting speed 3000 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61919-2RS." } ], "cross_ref": [ { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 95×130×18 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "71919", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "61919-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "61920", "brand": "SKF", "manufacturer_designation": "SKF 61920", "series": "61900-series", "type": "deep_groove", "d_mm": 100, "D_mm": 140, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 41.5, "fatigue_load_limit_kN": 1.63, "reference_speed_rpm": 9500, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 830, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61920 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61920 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61920 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61920-2Z (shields) and 61920-2RSH (contact seals), not suffix-free 61920.", "The 42.3/41.5 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61920 bearing?", "a": "A 61920 deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61920 bore code work?", "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61920 mean?", "a": "A bare 61920 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 100 mm bore?", "a": "619 is a thin section one step above 618: 140×20 mm with a 20.0 mm radial section at 100 mm bore; a 6220 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61920?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61920 — the open (unsealed) execution, 100×140×20 mm per ISO 15. Quoted values: C 42.3 kN, C0 41.5 kN, Pu 1.63 kN, limiting speed 6000 r/min, mass 830 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61920." } ], "cross_ref": [ { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 100×140×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "71920", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61921", "brand": "SKF", "manufacturer_designation": "SKF 61921", "series": "61900-series", "type": "deep_groove", "d_mm": 105, "D_mm": 145, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 44.2, "static_load_kN": 44, "fatigue_load_limit_kN": 1.7, "reference_speed_rpm": 9500, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 870, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61921 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×145×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 145 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61921.", "The open 61921 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61921-2Z (shields) and 61921-2RSH (contact seals), not suffix-free 61921.", "The 44.2/44 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61921 bearing?", "a": "A 61921 deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61921 bore code work?", "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61921 mean?", "a": "A bare 61921 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 105 mm bore?", "a": "619 is a thin section one step above 618: 145×20 mm with a 20.0 mm radial section at 105 mm bore; a 6221 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61921?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61921 — the open (unsealed) execution, 105×145×20 mm per ISO 15. Quoted values: C 44.2 kN, C0 44 kN, Pu 1.7 kN, limiting speed 5600 r/min, mass 870 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61921." } ], "cross_ref": [ { "equiv_sku": "61921-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61921-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×145×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61922", "brand": "SKF", "manufacturer_designation": "SKF 61922", "series": "61900-series", "type": "deep_groove", "d_mm": 110, "D_mm": 150, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 43.6, "static_load_kN": 45, "fatigue_load_limit_kN": 1.66, "reference_speed_rpm": 9000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "weight_g": 900, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61922 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61922 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61922 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61922-2Z (shields) and 61922-2RSH (contact seals), not suffix-free 61922.", "The 43.6/45 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61922 bearing?", "a": "A 61922 deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61922 bore code work?", "a": "The last two digits of 61922 are bore code 22, giving 22 × 5 = 110 mm bore. The 150 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61922 mean?", "a": "A bare 61922 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 110 mm bore?", "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61922?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61922 — the open (unsealed) execution, 110×150×20 mm per ISO 15. Quoted values: C 43.6 kN, C0 45 kN, Pu 1.66 kN, limiting speed 5600 r/min, mass 900 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61922." } ], "cross_ref": [ { "equiv_sku": "61922-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61922-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 110×150×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61924", "brand": "SKF", "manufacturer_designation": "SKF 61924", "series": "61900-series", "type": "deep_groove", "d_mm": 120, "D_mm": 165, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 55.3, "static_load_kN": 57, "fatigue_load_limit_kN": 2.04, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 1200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61924 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×165×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61924 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61924-2Z (shields) and 61924-2RSH (contact seals), not suffix-free 61924.", "The 55.3/57 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61924 bearing?", "a": "A 61924 deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61924 bore code work?", "a": "The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61924 mean?", "a": "A bare 61924 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 120 mm bore?", "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61924?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61924 — the open (unsealed) execution, 120×165×22 mm per ISO 15. Quoted values: C 55.3 kN, C0 57 kN, Pu 2.04 kN, limiting speed 5000 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61924." } ], "cross_ref": [ { "equiv_sku": "61924-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61924-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×165×22 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61926", "brand": "SKF", "manufacturer_designation": "SKF 61926", "series": "61900-series", "type": "deep_groove", "d_mm": 130, "D_mm": 180, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 65, "static_load_kN": 67, "fatigue_load_limit_kN": 2.28, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 1600, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61926 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×180×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61926 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61926 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61926-2Z (shields) and 61926-2RSH (contact seals), not suffix-free 61926.", "The 65/67 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61926 bearing?", "a": "A 61926 deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61926 bore code work?", "a": "The last two digits of 61926 are bore code 26, giving 26 × 5 = 130 mm bore. The 180 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61926 mean?", "a": "A bare 61926 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 130 mm bore?", "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61926?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61926 — the open (unsealed) execution, 130×180×24 mm per ISO 15. Quoted values: C 65 kN, C0 67 kN, Pu 2.28 kN, limiting speed 4500 r/min, mass 1600 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61926." } ], "cross_ref": [ { "equiv_sku": "61926-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61926-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×180×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61928", "brand": "SKF", "manufacturer_designation": "SKF 61928", "series": "61900-series", "type": "deep_groove", "d_mm": 140, "D_mm": 190, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 66.3, "static_load_kN": 72, "fatigue_load_limit_kN": 2.36, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 1700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (25.0 mm section height at 140 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61928 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×190×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61928 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61928-2Z (shields) and 61928-2RSH (contact seals), not suffix-free 61928.", "The 66.3/72 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61928 bearing?", "a": "A 61928 deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61928 bore code work?", "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61928 mean?", "a": "A bare 61928 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 140 mm bore?", "a": "619 is a thin section one step above 618: 190×24 mm with a 25.0 mm radial section at 140 mm bore; a 6228 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61928?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61928 — the open (unsealed) execution, 140×190×24 mm per ISO 15. Quoted values: C 66.3 kN, C0 72 kN, Pu 2.36 kN, limiting speed 4300 r/min, mass 1700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61928." } ], "cross_ref": [ { "equiv_sku": "61928-ZZ", "equiv_brand": "NSK", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "61928-2RS", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×190×24 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61932", "brand": "SKF", "manufacturer_designation": "SKF 61932", "series": "61900-series", "type": "deep_groove", "d_mm": 160, "D_mm": 220, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 92.3, "static_load_kN": 98, "fatigue_load_limit_kN": 3.05, "reference_speed_rpm": 6000, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 2700, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61932 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×220×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61932 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61932-2Z (shields) and 61932-2RSH (contact seals), not suffix-free 61932.", "The 92.3/98 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61932 bearing?", "a": "A 61932 deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61932 bore code work?", "a": "The last two digits of 61932 are bore code 32, giving 32 × 5 = 160 mm bore. The 220 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61932 mean?", "a": "A bare 61932 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 160 mm bore?", "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61932?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61932 — the open (unsealed) execution, 160×220×28 mm per ISO 15. Quoted values: C 92.3 kN, C0 98 kN, Pu 3.05 kN, limiting speed 3800 r/min, mass 2700 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61932." } ], "cross_ref": [ { "equiv_sku": "61932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61936", "brand": "SKF", "manufacturer_designation": "SKF 61936", "series": "61900-series", "type": "deep_groove", "d_mm": 180, "D_mm": 250, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 119, "static_load_kN": 134, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61936 carries bore code 36 = 180 mm. Outside diameter 250 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61936 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61936 units.", "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61936 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61936-2Z (shields) and 61936-2RSH (contact seals), not suffix-free 61936.", "The 119/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61936 bearing?", "a": "A 61936 deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61936 bore code work?", "a": "The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61936 mean?", "a": "A bare 61936 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 180 mm bore?", "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61936?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61936 — the open (unsealed) execution, 180×250×33 mm per ISO 15. Quoted values: C 119 kN, C0 134 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61936." } ], "cross_ref": [ { "equiv_sku": "61936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61938", "brand": "SKF", "manufacturer_designation": "SKF 61938", "series": "61900-series", "type": "deep_groove", "d_mm": 190, "D_mm": 260, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 117, "static_load_kN": 134, "fatigue_load_limit_kN": 3.8, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 4500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61938 carries bore code 38 = 190 mm. Outside diameter 260 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (35.0 mm section height at 190 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61938 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×260×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61938 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61938-2Z (shields) and 61938-2RSH (contact seals), not suffix-free 61938.", "The 117/134 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61938 bearing?", "a": "A 61938 deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61938 bore code work?", "a": "The last two digits of 61938 are bore code 38, giving 38 × 5 = 190 mm bore. The 260 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61938 mean?", "a": "A bare 61938 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 190 mm bore?", "a": "619 is a thin section one step above 618: 260×33 mm with a 35.0 mm radial section at 190 mm bore; a 6238 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61938?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61938 — the open (unsealed) execution, 190×260×33 mm per ISO 15. Quoted values: C 117 kN, C0 134 kN, Pu 3.8 kN, limiting speed 3200 r/min, mass 4500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61938." } ], "cross_ref": [ { "equiv_sku": "61938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61940", "brand": "SKF", "manufacturer_designation": "SKF 61940", "series": "61900-series", "type": "deep_groove", "d_mm": 200, "D_mm": 280, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 148, "static_load_kN": 166, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61940 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×280×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61940 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61940-2Z (shields) and 61940-2RSH (contact seals), not suffix-free 61940.", "The 148/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61940 bearing?", "a": "A 61940 deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61940 bore code work?", "a": "The last two digits of 61940 are bore code 40, giving 40 × 5 = 200 mm bore. The 280 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61940 mean?", "a": "A bare 61940 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 200 mm bore?", "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61940?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61940 — the open (unsealed) execution, 200×280×38 mm per ISO 15. Quoted values: C 148 kN, C0 166 kN, Pu 4.55 kN, limiting speed 3000 r/min, mass 6300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61940." } ], "cross_ref": [ { "equiv_sku": "61940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61944", "brand": "SKF", "manufacturer_designation": "SKF 61944", "series": "61900-series", "type": "deep_groove", "d_mm": 220, "D_mm": 300, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 151, "static_load_kN": 180, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 6800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61944 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61944 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61944-2Z (shields) and 61944-2RSH (contact seals), not suffix-free 61944.", "The 151/180 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61944 bearing?", "a": "A 61944 deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61944 bore code work?", "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61944 mean?", "a": "A bare 61944 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 220 mm bore?", "a": "619 is a thin section one step above 618: 300×38 mm with a 40.0 mm radial section at 220 mm bore; a 6244 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61944?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61944 — the open (unsealed) execution, 220×300×38 mm per ISO 15. Quoted values: C 151 kN, C0 180 kN, Pu 4.75 kN, limiting speed 2600 r/min, mass 6800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61944." } ], "cross_ref": [ { "equiv_sku": "61944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61948", "brand": "SKF", "manufacturer_designation": "SKF 61948", "series": "61900-series", "type": "deep_groove", "d_mm": 240, "D_mm": 320, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 159, "static_load_kN": 200, "fatigue_load_limit_kN": 5.1, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 7300, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61948 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61948 units.", "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61948 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61948-2Z (shields) and 61948-2RSH (contact seals), not suffix-free 61948.", "The 159/200 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61948 bearing?", "a": "A 61948 deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61948 bore code work?", "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61948 mean?", "a": "A bare 61948 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 240 mm bore?", "a": "619 is a thin section one step above 618: 320×38 mm with a 40.0 mm radial section at 240 mm bore; a 6248 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61948?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61948 — the open (unsealed) execution, 240×320×38 mm per ISO 15. Quoted values: C 159 kN, C0 200 kN, Pu 5.1 kN, limiting speed 2400 r/min, mass 7300 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61948." } ], "cross_ref": [ { "equiv_sku": "61948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61952", "brand": "SKF", "manufacturer_designation": "SKF 61952", "series": "61900-series", "type": "deep_groove", "d_mm": 260, "D_mm": 360, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 270, "fatigue_load_limit_kN": 6.55, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61952 carries bore code 52 = 260 mm. Outside diameter 360 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 260 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (50.0 mm section height at 260 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61952 has no lubricant retention: grease escapes and contaminants migrate straight into the 260×360×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61952 units.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61952 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61952-2Z (shields) and 61952-2RSH (contact seals), not suffix-free 61952.", "The 212/270 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61952 bearing?", "a": "A 61952 deep-groove ball bearing has a 260 mm bore, 360 mm outer diameter and 46 mm width (10.236 × 14.173 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61952 bore code work?", "a": "The last two digits of 61952 are bore code 52, giving 52 × 5 = 260 mm bore. The 360 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61952 mean?", "a": "A bare 61952 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 260 mm bore?", "a": "619 is a thin section one step above 618: 360×46 mm with a 50.0 mm radial section at 260 mm bore; a 6252 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61952?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61952 — the open (unsealed) execution, 260×360×46 mm per ISO 15. Quoted values: C 212 kN, C0 270 kN, Pu 6.55 kN, limiting speed 2200 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61952." } ], "cross_ref": [ { "equiv_sku": "61952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61956", "brand": "SKF", "manufacturer_designation": "SKF 61956", "series": "61900-series", "type": "deep_groove", "d_mm": 280, "D_mm": 380, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 216, "static_load_kN": 285, "fatigue_load_limit_kN": 6.7, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 12000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61956 carries bore code 56 = 280 mm. Outside diameter 380 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 280 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 280 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (50.0 mm section height at 280 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61956 has no lubricant retention: grease escapes and contaminants migrate straight into the 280×380×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61956 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61956 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61956-2Z (shields) and 61956-2RSH (contact seals), not suffix-free 61956.", "The 216/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61956 bearing?", "a": "A 61956 deep-groove ball bearing has a 280 mm bore, 380 mm outer diameter and 46 mm width (11.024 × 14.961 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61956 bore code work?", "a": "The last two digits of 61956 are bore code 56, giving 56 × 5 = 280 mm bore. The 380 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61956 mean?", "a": "A bare 61956 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 280 mm bore?", "a": "619 is a thin section one step above 618: 380×46 mm with a 50.0 mm radial section at 280 mm bore; a 6256 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61956?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61956 — the open (unsealed) execution, 280×380×46 mm per ISO 15. Quoted values: C 216 kN, C0 285 kN, Pu 6.7 kN, limiting speed 2000 r/min, mass 12000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61956." } ], "cross_ref": [ { "equiv_sku": "61956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "61960", "brand": "SKF", "manufacturer_designation": "SKF 61960", "series": "61900-series", "type": "deep_groove", "d_mm": 300, "D_mm": 420, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 375, "fatigue_load_limit_kN": 8.3, "reference_speed_rpm": 3000, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 19000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61960 carries bore code 60 = 300 mm. Outside diameter 420 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 300 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 300 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (60.0 mm section height at 300 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The open 61960 has no lubricant retention: grease escapes and contaminants migrate straight into the 300×420×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61960 units.", "A 300 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 61960 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61960-2Z (shields) and 61960-2RSH (contact seals), not suffix-free 61960.", "The 270/375 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 61960 bearing?", "a": "A 61960 deep-groove ball bearing has a 300 mm bore, 420 mm outer diameter and 56 mm width (11.811 × 16.535 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61960 bore code work?", "a": "The last two digits of 61960 are bore code 60, giving 60 × 5 = 300 mm bore. The 420 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61960 mean?", "a": "A bare 61960 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61900 compare with other series at the same 300 mm bore?", "a": "619 is a thin section one step above 618: 420×56 mm with a 60.0 mm radial section at 300 mm bore; a 6260 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the SKF designation and catalogue data for 61960?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 61960 — the open (unsealed) execution, 300×420×56 mm per ISO 15. Quoted values: C 270 kN, C0 375 kN, Pu 8.3 kN, limiting speed 1900 r/min, mass 19000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61960." } ], "cross_ref": [ { "equiv_sku": "61960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6200-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6200-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5.4, "static_load_kN": 2.36, "fatigue_load_limit_kN": 0.1, "reference_speed_rpm": 56000, "limiting_speed_rpm": 28000, "max_rpm": 28000, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "power tools", "small fans and blowers", "garden equipment", "instrument drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6300 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6200-RSR run faster than contact-seal 6200-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6200-2RS instead.", "The non-contact lip of 6200-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6200-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 28000 r/min limiting speed, closer to the open bearing's 56000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 5.4/2.36 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6200-RSR bearing?", "a": "A 6200-RSR deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6200-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6300 on the same bore is larger and higher-rated; a 6000 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6200-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6200-2RSL — two low-friction non-contact elastomer seals, 10×30×9 mm per ISO 15. Quoted values: C 5.4 kN, C0 2.36 kN, Pu 0.1 kN, limiting speed 28000 r/min, mass 32 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6200-RSR." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7200", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6200-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6201-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6201-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 7.28, "static_load_kN": 3.1, "fatigue_load_limit_kN": 0.132, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6301 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6201-RSR run faster than contact-seal 6201-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6201-2RS instead.", "The non-contact lip of 6201-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6201-RSR.", "SKF catalogues the low-friction seal as 6201-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 7.28/3.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6201-RSR bearing?", "a": "A 6201-RSR deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6201-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6301 on the same bore is larger and higher-rated; a 6001 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6201-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6201-2RSL — two low-friction non-contact elastomer seals, 12×32×10 mm per ISO 15. Quoted values: C 7.28 kN, C0 3.1 kN, Pu 0.132 kN, limiting speed 26000 r/min, mass 38 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6201-RSR." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7201", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [ "6201-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6202-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6202-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.06, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "reference_speed_rpm": 43000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 46, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6302 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6202-RSR run faster than contact-seal 6202-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6202-2RS instead.", "The non-contact lip of 6202-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6202-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 43000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.06/3.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6202-RSR bearing?", "a": "A 6202-RSR deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6202-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6302 on the same bore is larger and higher-rated; a 6002 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6202-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6202-2RSL — two low-friction non-contact elastomer seals, 15×35×11 mm per ISO 15. Quoted values: C 8.06 kN, C0 3.75 kN, Pu 0.16 kN, limiting speed 22000 r/min, mass 46 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6202-RSR." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7202", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6202-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6203-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6203-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 9.95, "static_load_kN": 4.75, "fatigue_load_limit_kN": 0.2, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6303 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6203-RSR run faster than contact-seal 6203-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6203-2RS instead.", "The non-contact lip of 6203-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6203-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 9.95/4.75 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6203-RSR bearing?", "a": "A 6203-RSR deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6203-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with a 11.5 mm radial section at 17 mm bore. A 6303 on the same bore is larger and higher-rated; a 6003 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6203-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6203-2RSL — two low-friction non-contact elastomer seals, 17×40×12 mm per ISO 15. Quoted values: C 9.95 kN, C0 4.75 kN, Pu 0.2 kN, limiting speed 19000 r/min, mass 67 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6203-RSR." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7203", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6203-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6204-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6204-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 13.5, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "reference_speed_rpm": 32000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 110, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6204-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6204-RSR run faster than contact-seal 6204-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6204-2RS instead.", "The non-contact lip of 6204-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6204-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 32000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 13.5/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6204-RSR bearing?", "a": "A 6204-RSR deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6204 bore code work?", "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6204-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 20 mm bore?", "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6204-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6204-2RSL — two low-friction non-contact elastomer seals, 20×47×14 mm per ISO 15. Quoted values: C 13.5 kN, C0 6.55 kN, Pu 0.28 kN, limiting speed 17000 r/min, mass 110 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6204-RSR." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7204", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU204", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6204-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6205-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6205-2RSL", "series": "6200-series", "type": "deep_groove", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.8, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 28000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 130, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "centrifugal pumps", "small gearboxes", "conveyors and drives", "agricultural equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6205-RSR run faster than contact-seal 6205-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6205-2RS instead.", "The non-contact lip of 6205-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6205-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 14000 r/min limiting speed, closer to the open bearing's 28000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.8/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6205-RSR bearing?", "a": "A 6205-RSR deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6205 bore code work?", "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6205-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 25 mm bore?", "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6205-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6205-2RSL — two low-friction non-contact elastomer seals, 25×52×15 mm per ISO 15. Quoted values: C 14.8 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 14000 r/min, mass 130 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6205-RSR." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7205", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU205", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6205-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6206-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6206-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 20.3, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "reference_speed_rpm": 24000, "limiting_speed_rpm": 12000, "max_rpm": 12000, "weight_g": 200, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6206-RSR run faster than contact-seal 6206-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6206-2RS instead.", "The non-contact lip of 6206-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6206-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 12000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 20.3/11.2 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6206-RSR bearing?", "a": "A 6206-RSR deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6206 bore code work?", "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6206-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 30 mm bore?", "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6206-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6206-2RZ — two low-friction non-contact elastomer seals, 30×62×16 mm per ISO 15. Quoted values: C 20.3 kN, C0 11.2 kN, Pu 0.475 kN, limiting speed 12000 r/min, mass 200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6206-RSR." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7206", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU206", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6206-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6208-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6208-2RZ", "series": "6200-series", "type": "deep_groove", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 32.5, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "reference_speed_rpm": 18000, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 380, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.", "RSR low-friction seals on 6208-RSR run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.", "The non-contact lip of 6208-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6208-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 9000 r/min limiting speed, closer to the open bearing's 18000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 32.5/19 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6208-RSR bearing?", "a": "A 6208-RSR deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6208 bore code work?", "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6208-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6200 compare with other series at the same 40 mm bore?", "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6208-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6208-2RZ — two low-friction non-contact elastomer seals, 40×80×18 mm per ISO 15. Quoted values: C 32.5 kN, C0 19 kN, Pu 0.8 kN, limiting speed 9000 r/min, mass 380 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6208-RSR." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7208", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU208", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6208-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224", "brand": "SKF", "manufacturer_designation": "SKF 6224", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 4000, "max_rpm": 4000, "weight_g": 5250, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6224 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×215×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6224 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6224 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6224-2Z (shields) and 6224-2RSH (contact seals), not suffix-free 6224.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224 bearing?", "a": "A 6224 deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6224 mean?", "a": "A bare 6224 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224 — the open (unsealed) execution, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 4000 r/min, mass 5250 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6224-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6224-2RS runs slower and cooler-limited than the open 6224; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6224-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the contact-sealed version as 6224-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1900 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 6300 r/min thermal reference speed. The single-seal catalogue number is 6224-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6224-RS1 exists for arrangements that lubricate through the open side; fitting 6224-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-2RS bearing?", "a": "A 6224-2RS deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6224-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 1900 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-2RS." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6224-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6224-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 146, "static_load_kN": 118, "fatigue_load_limit_kN": 3.9, "reference_speed_rpm": 6300, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 5350, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6224-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.", "Shielded 6224-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF spells the shielded version 6224-2Z (one shield: 6224-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6224-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6224-2Z for high-contamination positions.", "The 146/118 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6224-ZZ bearing?", "a": "A 6224-ZZ deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6224 bore code work?", "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6224-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 120 mm bore?", "a": "The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6224-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6224-2Z — two non-contact sheet-metal shields, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-ZZ." } ], "cross_ref": [ { "equiv_sku": "6224", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6224-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226", "brand": "SKF", "manufacturer_designation": "SKF 6226", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 5850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "The open 6226 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6226 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6226-2Z (shields) and 6226-2RSH (contact seals), not suffix-free 6226.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226 bearing?", "a": "A 6226 deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6226 mean?", "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226 — the open (unsealed) execution, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3600 r/min, mass 5850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6226-2RS1", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6226-2RS runs slower and cooler-limited than the open 6226; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6226-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the contact-sealed version as 6226-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1800 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6226-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6226-RS1 exists for arrangements that lubricate through the open side; fitting 6226-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-2RS bearing?", "a": "A 6226-2RS deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6226-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2RS1 — two contact elastomer seals over a lifetime grease fill, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 1800 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-2RS." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6226-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6226-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 156, "static_load_kN": 132, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 6000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6226-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6226-2RS for that.", "Shielded 6226-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF spells the shielded version 6226-2Z (one shield: 6226-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6226-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6226-2Z for high-contamination positions.", "The 156/132 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6226-ZZ bearing?", "a": "A 6226-ZZ deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6226 bore code work?", "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6226-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 130 mm bore?", "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6226-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6226-2Z — two non-contact sheet-metal shields, 130×230×40 mm per ISO 15. Quoted values: C 156 kN, C0 132 kN, Pu 4.15 kN, limiting speed 3000 r/min, mass 6000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6226-ZZ." } ], "cross_ref": [ { "equiv_sku": "6226", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "6226-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6228", "brand": "SKF", "manufacturer_designation": "SKF 6228", "series": "6200-series", "type": "deep_groove", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 165, "static_load_kN": 150, "fatigue_load_limit_kN": 4.55, "reference_speed_rpm": 5300, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 7750, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.", "The open 6228 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.", "A 140 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6228 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6228-2Z (shields) and 6228-2RSH (contact seals), not suffix-free 6228.", "The 165/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6228 bearing?", "a": "A 6228 deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6228 bore code work?", "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6228 mean?", "a": "A bare 6228 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 140 mm bore?", "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6228?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6228 — the open (unsealed) execution, 140×250×42 mm per ISO 15. Quoted values: C 165 kN, C0 150 kN, Pu 4.55 kN, limiting speed 3400 r/min, mass 7750 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6228." } ], "cross_ref": [ { "equiv_sku": "6228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6230", "brand": "SKF", "manufacturer_designation": "SKF 6230", "series": "6200-series", "type": "deep_groove", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 166, "fatigue_load_limit_kN": 4.9, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 10000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.", "The open 6230 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6230 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6230-2Z (shields) and 6230-2RSH (contact seals), not suffix-free 6230.", "The 174/166 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6230 bearing?", "a": "A 6230 deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6230 bore code work?", "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6230 mean?", "a": "A bare 6230 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 150 mm bore?", "a": "The '2' is the light diameter series: 270×45 mm with a 60.0 mm radial section at 150 mm bore. A 6330 on the same bore is larger and higher-rated; a 6030 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6230?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6230 — the open (unsealed) execution, 150×270×45 mm per ISO 15. Quoted values: C 174 kN, C0 166 kN, Pu 4.9 kN, limiting speed 3200 r/min, mass 10000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6230." } ], "cross_ref": [ { "equiv_sku": "6230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6232", "brand": "SKF", "manufacturer_designation": "SKF 6232", "series": "6200-series", "type": "deep_groove", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 5.3, "reference_speed_rpm": 4500, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 13000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.", "The open 6232 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×290×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6232 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6232 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6232-2Z (shields) and 6232-2RSH (contact seals), not suffix-free 6232.", "The 186/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6232 bearing?", "a": "A 6232 deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6232 bore code work?", "a": "The last two digits of 6232 are bore code 32, giving 32 × 5 = 160 mm bore. The 290 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6232 mean?", "a": "A bare 6232 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 160 mm bore?", "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6232?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6232 — the open (unsealed) execution, 160×290×48 mm per ISO 15. Quoted values: C 186 kN, C0 186 kN, Pu 5.3 kN, limiting speed 3000 r/min, mass 13000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6232." } ], "cross_ref": [ { "equiv_sku": "6232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6234", "brand": "SKF", "manufacturer_designation": "SKF 6234", "series": "6200-series", "type": "deep_groove", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 212, "static_load_kN": 224, "fatigue_load_limit_kN": 6.1, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 170 mm bore; before upgrading to a 6334 for extra capacity, confirm the housing accepts a 310 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6234 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6234 units.", "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6234 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6234-2Z (shields) and 6234-2RSH (contact seals), not suffix-free 6234.", "The 212/224 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6234 bearing?", "a": "A 6234 deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6234 bore code work?", "a": "The last two digits of 6234 are bore code 34, giving 34 × 5 = 170 mm bore. The 310 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6234 mean?", "a": "A bare 6234 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 170 mm bore?", "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6234?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6234 — the open (unsealed) execution, 170×310×52 mm per ISO 15. Quoted values: C 212 kN, C0 224 kN, Pu 6.1 kN, limiting speed 2800 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6234." } ], "cross_ref": [ { "equiv_sku": "6234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6236", "brand": "SKF", "manufacturer_designation": "SKF 6236", "series": "6200-series", "type": "deep_groove", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 6.4, "reference_speed_rpm": 4000, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.", "The open 6236 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6236 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6236 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6236-2Z (shields) and 6236-2RSH (contact seals), not suffix-free 6236.", "The 229/240 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6236 bearing?", "a": "A 6236 deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6236 bore code work?", "a": "The last two digits of 6236 are bore code 36, giving 36 × 5 = 180 mm bore. The 320 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6236 mean?", "a": "A bare 6236 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 180 mm bore?", "a": "The '2' is the light diameter series: 320×52 mm with a 70.0 mm radial section at 180 mm bore. A 6336 on the same bore is larger and higher-rated; a 6036 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6236?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6236 — the open (unsealed) execution, 180×320×52 mm per ISO 15. Quoted values: C 229 kN, C0 240 kN, Pu 6.4 kN, limiting speed 2600 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6236." } ], "cross_ref": [ { "equiv_sku": "6236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6238", "brand": "SKF", "manufacturer_designation": "SKF 6238", "series": "6200-series", "type": "deep_groove", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 280, "fatigue_load_limit_kN": 7.35, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 19500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6238 carries bore code 38 = 190 mm. Outside diameter 340 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.", "The open 6238 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×340×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6238 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6238 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6238-2Z (shields) and 6238-2RSH (contact seals), not suffix-free 6238.", "The 255/280 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6238 bearing?", "a": "A 6238 deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6238 bore code work?", "a": "The last two digits of 6238 are bore code 38, giving 38 × 5 = 190 mm bore. The 340 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6238 mean?", "a": "A bare 6238 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 190 mm bore?", "a": "The '2' is the light diameter series: 340×55 mm with a 75.0 mm radial section at 190 mm bore. A 6338 on the same bore is larger and higher-rated; a 6038 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6238?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6238 — the open (unsealed) execution, 190×340×55 mm per ISO 15. Quoted values: C 255 kN, C0 280 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 19500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6238." } ], "cross_ref": [ { "equiv_sku": "6238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6240", "brand": "SKF", "manufacturer_designation": "SKF 6240", "series": "6200-series", "type": "deep_groove", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 270, "static_load_kN": 310, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 23500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.", "The open 6240 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×360×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.", "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "The open 6240 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6240-2Z (shields) and 6240-2RSH (contact seals), not suffix-free 6240.", "The 270/310 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6240 bearing?", "a": "A 6240 deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6240 bore code work?", "a": "The last two digits of 6240 are bore code 40, giving 40 × 5 = 200 mm bore. The 360 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6240 mean?", "a": "A bare 6240 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 200 mm bore?", "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6240?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6240 — the open (unsealed) execution, 200×360×58 mm per ISO 15. Quoted values: C 270 kN, C0 310 kN, Pu 7.8 kN, limiting speed 2200 r/min, mass 23500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6240." } ], "cross_ref": [ { "equiv_sku": "6240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6244", "brand": "SKF", "manufacturer_designation": "SKF 6244", "series": "6200-series", "type": "deep_groove", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 296, "static_load_kN": 365, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3200, "limiting_speed_rpm": 2000, "max_rpm": 2000, "weight_g": 33500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6244 carries bore code 44 = 220 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 62xx light series is the default general-purpose section at 220 mm bore; before upgrading to a 6344 for extra capacity, confirm the housing accepts a 400 mm OD and 65 mm width — it is not a drop-in swap.", "The open 6244 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6244 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6244-2Z (shields) and 6244-2RSH (contact seals), not suffix-free 6244.", "The 296/365 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6244 bearing?", "a": "A 6244 deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6244 bore code work?", "a": "The last two digits of 6244 are bore code 44, giving 44 × 5 = 220 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6244 mean?", "a": "A bare 6244 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 220 mm bore?", "a": "The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated." }, { "q": "What is the SKF designation and catalogue data for 6244?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6244 — the open (unsealed) execution, 220×400×65 mm per ISO 15. Quoted values: C 296 kN, C0 365 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 33500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6244." } ], "cross_ref": [ { "equiv_sku": "6244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6300-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6300-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 8.52, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.143, "reference_speed_rpm": 50000, "limiting_speed_rpm": 26000, "max_rpm": 26000, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "garden equipment", "instrument drives", "fractional-horsepower electric motors", "domestic appliances" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6200.", "RSR low-friction seals on 6300-RSR run faster than contact-seal 6300-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6300-2RS instead.", "The non-contact lip of 6300-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6300-RSR.", "SKF catalogues the low-friction seal as 6300-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 26000 r/min limiting speed, closer to the open bearing's 50000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 8.52/3.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6300-RSR bearing?", "a": "A 6300-RSR deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6300-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6200 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6300-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6300-2RSL — two low-friction non-contact elastomer seals, 10×35×11 mm per ISO 15. Quoted values: C 8.52 kN, C0 3.4 kN, Pu 0.143 kN, limiting speed 26000 r/min, mass 53 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6300-RSR." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7300", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6300-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6301-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6301-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 10.1, "static_load_kN": 4.15, "fatigue_load_limit_kN": 0.176, "reference_speed_rpm": 45000, "limiting_speed_rpm": 22000, "max_rpm": 22000, "weight_g": 60, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "instrument drives", "fractional-horsepower electric motors", "domestic appliances", "power tools" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6201.", "RSR low-friction seals on 6301-RSR run faster than contact-seal 6301-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6301-2RS instead.", "The non-contact lip of 6301-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.", "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "SKF catalogues the low-friction seal as 6301-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 22000 r/min limiting speed, closer to the open bearing's 45000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 10.1/4.15 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6301-RSR bearing?", "a": "A 6301-RSR deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6301-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6201 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6301-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6301-2RSL — two low-friction non-contact elastomer seals, 12×37×12 mm per ISO 15. Quoted values: C 10.1 kN, C0 4.15 kN, Pu 0.176 kN, limiting speed 22000 r/min, mass 60 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6301-RSR." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7301", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6301-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6302-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6302-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 11.9, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.228, "reference_speed_rpm": 38000, "limiting_speed_rpm": 19000, "max_rpm": 19000, "weight_g": 85, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "fractional-horsepower electric motors", "domestic appliances", "power tools", "small fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6202.", "RSR low-friction seals on 6302-RSR run faster than contact-seal 6302-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6302-2RS instead.", "The non-contact lip of 6302-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6302-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6302-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 19000 r/min limiting speed, closer to the open bearing's 38000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 11.9/5.4 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6302-RSR bearing?", "a": "A 6302-RSR deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6302-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6202 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6302-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6302-2RSL — two low-friction non-contact elastomer seals, 15×42×13 mm per ISO 15. Quoted values: C 11.9 kN, C0 5.4 kN, Pu 0.228 kN, limiting speed 19000 r/min, mass 85 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6302-RSR." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7302", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6302-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6303-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6303-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.3, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.275, "reference_speed_rpm": 34000, "limiting_speed_rpm": 17000, "max_rpm": 17000, "weight_g": 120, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "domestic appliances", "power tools", "small fans and blowers", "garden equipment" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6203.", "RSR low-friction seals on 6303-RSR run faster than contact-seal 6303-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6303-2RS instead.", "The non-contact lip of 6303-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.", "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "SKF catalogues the low-friction seal as 6303-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 17000 r/min limiting speed, closer to the open bearing's 34000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 14.3/6.55 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6303-RSR bearing?", "a": "A 6303-RSR deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "Why does 6303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does the RSR suffix on 6303-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 17 mm bore?", "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6203 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6303-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6303-2RSL — two low-friction non-contact elastomer seals, 17×47×14 mm per ISO 15. Quoted values: C 14.3 kN, C0 6.55 kN, Pu 0.275 kN, limiting speed 17000 r/min, mass 120 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6303-RSR." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty." }, { "equiv_sku": "7303", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6303-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6304-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6304-2RSL", "series": "6300-series", "type": "deep_groove", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 15.9, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "reference_speed_rpm": 30000, "limiting_speed_rpm": 15000, "max_rpm": 15000, "weight_g": 150, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small gearboxes", "conveyors and drives", "agricultural equipment", "fans and blowers" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.", "RSR low-friction seals on 6304-RSR run faster than contact-seal 6304-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6304-2RS instead.", "The non-contact lip of 6304-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the low-friction seal as 6304-2RSL (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 15000 r/min limiting speed, closer to the open bearing's 30000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 15.9/7.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6304-RSR bearing?", "a": "A 6304-RSR deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6304 bore code work?", "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6304-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 20 mm bore?", "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6304-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6304-2RSL — two low-friction non-contact elastomer seals, 20×52×15 mm per ISO 15. Quoted values: C 15.9 kN, C0 7.8 kN, Pu 0.335 kN, limiting speed 15000 r/min, mass 150 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6304-RSR." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7304", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU304", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6304-2RSL" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6305-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6305-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 23.4, "static_load_kN": 11.6, "fatigue_load_limit_kN": 0.49, "reference_speed_rpm": 24000, "limiting_speed_rpm": 13000, "max_rpm": 13000, "weight_g": 230, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyors and drives", "agricultural equipment", "fans and blowers", "electric motors" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.", "RSR low-friction seals on 6305-RSR run faster than contact-seal 6305-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6305-2RS instead.", "The non-contact lip of 6305-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "SKF catalogues the low-friction seal as 6305-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 13000 r/min limiting speed, closer to the open bearing's 24000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 23.4/11.6 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6305-RSR bearing?", "a": "A 6305-RSR deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6305 bore code work?", "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6305-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 25 mm bore?", "a": "The '3' is the medium diameter series: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 6205 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6305-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6305-2RZ — two low-friction non-contact elastomer seals, 25×62×17 mm per ISO 15. Quoted values: C 23.4 kN, C0 11.6 kN, Pu 0.49 kN, limiting speed 13000 r/min, mass 230 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6305-RSR." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7305", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU305", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6305-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6306-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6306-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 29.6, "static_load_kN": 16, "fatigue_load_limit_kN": 0.67, "reference_speed_rpm": 20000, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 360, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "agricultural equipment", "fans and blowers", "electric motors", "centrifugal pumps" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier rolling elements also trade away some speed versus a 6206.", "RSR low-friction seals on 6306-RSR run faster than contact-seal 6306-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6306-2RS instead.", "The non-contact lip of 6306-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6306-RSR.", "SKF catalogues the low-friction seal as 6306-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 20000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 29.6/16 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6306-RSR bearing?", "a": "A 6306-RSR deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6306 bore code work?", "a": "The last two digits of 6306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6306-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 30 mm bore?", "a": "The '3' is the medium diameter series: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 6206 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6306-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6306-2RZ — two low-friction non-contact elastomer seals, 30×72×19 mm per ISO 15. Quoted values: C 29.6 kN, C0 16 kN, Pu 0.67 kN, limiting speed 11000 r/min, mass 360 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6306-RSR." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7306", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU306", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6306-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6308-RSR", "brand": "SKF", "manufacturer_designation": "SKF 6308-2RZ", "series": "6300-series", "type": "deep_groove", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "RSR", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 42.3, "static_load_kN": 24, "fatigue_load_limit_kN": 1.02, "reference_speed_rpm": 17000, "limiting_speed_rpm": 8500, "max_rpm": 8500, "weight_g": 650, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "electric motors", "centrifugal pumps", "small gearboxes", "conveyors and drives" ], "failure_modes": [ "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)", "lip-lubricant starvation if the bearing runs dry for extended periods", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6308-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.", "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.", "RSR low-friction seals on 6308-RSR run faster than contact-seal 6308-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6308-2RS instead.", "The non-contact lip of 6308-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-C3. No clearance suffix means normal CN clearance.", "SKF catalogues the low-friction seal as 6308-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 8500 r/min limiting speed, closer to the open bearing's 17000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.", "The 42.3/24 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6308-RSR bearing?", "a": "A 6308-RSR deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals." }, { "q": "How does the 6308 bore code work?", "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the RSR suffix on 6308-RSR mean?", "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments." }, { "q": "How does the 6300 compare with other series at the same 40 mm bore?", "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6308-RSR?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6308-2RZ — two low-friction non-contact elastomer seals, 40×90×23 mm per ISO 15. Quoted values: C 42.3 kN, C0 24 kN, Pu 1.02 kN, limiting speed 8500 r/min, mass 650 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6308-RSR." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." }, { "equiv_sku": "7308", "equiv_brand": "GENERIC-ISO", "level": "verify" }, { "equiv_sku": "NU308", "equiv_brand": "GENERIC-ISO", "level": "verify" } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6308-2RZ" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324", "brand": "SKF", "manufacturer_designation": "SKF 6324", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "The open 6324 has no lubricant retention: grease escapes and contaminants migrate straight into the 120×260×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6324 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324.", "The open 6324 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6324-2Z (shields) and 6324-2RSH (contact seals), not suffix-free 6324.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324 bearing?", "a": "A 6324 deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6324 mean?", "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324 — the open (unsealed) execution, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 3400 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-2RS", "brand": "SKF", "manufacturer_designation": "SKF 6324-2RS1", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 1700, "max_rpm": 1700, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "Contact seals add drag and heat: 6324-2RS runs slower and cooler-limited than the open 6324; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6324-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "SKF catalogues the contact-sealed version as 6324-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 1700 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 5600 r/min thermal reference speed. The single-seal catalogue number is 6324-RS1, used where one shaft side needs external relubrication.", "A one-seal execution 6324-RS1 exists for arrangements that lubricate through the open side; fitting 6324-2RS1 instead means lifetime grease and no external oil supply — mixing the two in the same shaft can starve the sealed position.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-2RS bearing?", "a": "A 6324-2RS deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6324-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324-2RS?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2RS1 — two contact elastomer seals over a lifetime grease fill, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 1700 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-2RS." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2RS1" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 110, "clearance_options": [ "CN", "C3" ] }, { "sku": "6324-ZZ", "brand": "SKF", "manufacturer_designation": "SKF 6324-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 208, "static_load_kN": 186, "fatigue_load_limit_kN": 5.7, "reference_speed_rpm": 5600, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 12500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.", "ZZ shields are non-contact: 6324-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6324-2RS for that.", "Shielded 6324-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6324-C3. No clearance suffix means normal CN clearance.", "SKF spells the shielded version 6324-2Z (one shield: 6324-Z), not \"-ZZ\": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.", "The single-shield execution 6324-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6324-2Z for high-contamination positions.", "The 208/186 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6324-ZZ bearing?", "a": "A 6324-ZZ deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6324 bore code work?", "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6324-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6300 compare with other series at the same 120 mm bore?", "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6324-ZZ?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6324-2Z — two non-contact sheet-metal shields, 120×260×55 mm per ISO 15. Quoted values: C 208 kN, C0 186 kN, Pu 5.7 kN, limiting speed 2800 r/min, mass 12500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6324-ZZ." } ], "cross_ref": [ { "equiv_sku": "6324", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [ "6324-2Z" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN", "C3" ] }, { "sku": "6326", "brand": "SKF", "manufacturer_designation": "SKF 6326", "series": "6300-series", "type": "deep_groove", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 229, "static_load_kN": 216, "fatigue_load_limit_kN": 6.3, "reference_speed_rpm": 5000, "limiting_speed_rpm": 3200, "max_rpm": 3200, "weight_g": 15000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.", "The open 6326 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6326-C3. No clearance suffix means normal CN clearance.", "The open 6326 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6326-2Z (shields) and 6326-2RSH (contact seals), not suffix-free 6326.", "The 229/216 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6326 bearing?", "a": "A 6326 deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6326 bore code work?", "a": "The last two digits of 6326 are bore code 26, giving 26 × 5 = 130 mm bore. The 280 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6326 mean?", "a": "A bare 6326 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 130 mm bore?", "a": "The '3' is the medium diameter series: 280×58 mm, 75.0 mm radial section at 130 mm bore, carrying more load than a 6226 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6326?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6326 — the open (unsealed) execution, 130×280×58 mm per ISO 15. Quoted values: C 229 kN, C0 216 kN, Pu 6.3 kN, limiting speed 3200 r/min, mass 15000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6326." } ], "cross_ref": [ { "equiv_sku": "6326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6328", "brand": "SKF", "manufacturer_designation": "SKF 6328", "series": "6300-series", "type": "deep_groove", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 251, "static_load_kN": 245, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 4800, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 18500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6328 carries bore code 28 = 140 mm. Outside diameter 300 mm and width 62 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.", "The open 6328 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×300×62 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.", "Shaft and housing fillets must clear the bearing chamfer so the 62 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6328 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6328-2Z (shields) and 6328-2RSH (contact seals), not suffix-free 6328.", "The 251/245 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6328 bearing?", "a": "A 6328 deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6328 bore code work?", "a": "The last two digits of 6328 are bore code 28, giving 28 × 5 = 140 mm bore. The 300 mm outside diameter and 62 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6328 mean?", "a": "A bare 6328 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 140 mm bore?", "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6328?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6328 — the open (unsealed) execution, 140×300×62 mm per ISO 15. Quoted values: C 251 kN, C0 245 kN, Pu 7.1 kN, limiting speed 3000 r/min, mass 18500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6328." } ], "cross_ref": [ { "equiv_sku": "6328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6330", "brand": "SKF", "manufacturer_designation": "SKF 6330", "series": "6300-series", "type": "deep_groove", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 285, "fatigue_load_limit_kN": 7.8, "reference_speed_rpm": 4300, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 23000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6330 carries bore code 30 = 150 mm. Outside diameter 320 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.", "The open 6330 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×320×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6330 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6330.", "The open 6330 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6330-2Z (shields) and 6330-2RSH (contact seals), not suffix-free 6330.", "The 276/285 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6330 bearing?", "a": "A 6330 deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6330 bore code work?", "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6330 mean?", "a": "A bare 6330 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 150 mm bore?", "a": "The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6330?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6330 — the open (unsealed) execution, 150×320×65 mm per ISO 15. Quoted values: C 276 kN, C0 285 kN, Pu 7.8 kN, limiting speed 2800 r/min, mass 23000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6330." } ], "cross_ref": [ { "equiv_sku": "6330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6334", "brand": "SKF", "manufacturer_designation": "SKF 6334", "series": "6300-series", "type": "deep_groove", "d_mm": 170, "D_mm": 360, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 312, "static_load_kN": 340, "fatigue_load_limit_kN": 8.8, "reference_speed_rpm": 3800, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 31000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6334 carries bore code 34 = 170 mm. Outside diameter 360 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "industrial fans and blowers", "hoists and winches", "heavy conveyors", "pulp and paper machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.", "The open 6334 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×360×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6334 units.", "Shaft and housing fillets must clear the bearing chamfer so the 72 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6334 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6334-2Z (shields) and 6334-2RSH (contact seals), not suffix-free 6334.", "The 312/340 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6334 bearing?", "a": "A 6334 deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6334 bore code work?", "a": "The last two digits of 6334 are bore code 34, giving 34 × 5 = 170 mm bore. The 360 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6334 mean?", "a": "A bare 6334 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 170 mm bore?", "a": "The '3' is the medium diameter series: 360×72 mm, 95.0 mm radial section at 170 mm bore, carrying more load than a 6234 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6334?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6334 — the open (unsealed) execution, 170×360×72 mm per ISO 15. Quoted values: C 312 kN, C0 340 kN, Pu 8.8 kN, limiting speed 2400 r/min, mass 31000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6334." } ], "cross_ref": [ { "equiv_sku": "6334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6336", "brand": "SKF", "manufacturer_designation": "SKF 6336", "series": "6300-series", "type": "deep_groove", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 351, "static_load_kN": 405, "fatigue_load_limit_kN": 10.4, "reference_speed_rpm": 3600, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 36500, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6336 carries bore code 36 = 180 mm. Outside diameter 380 mm and width 75 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.", "The open 6336 has no lubricant retention: grease escapes and contaminants migrate straight into the 180×380×75 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6336 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 380 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6336.", "The open 6336 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6336-2Z (shields) and 6336-2RSH (contact seals), not suffix-free 6336.", "The 351/405 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6336 bearing?", "a": "A 6336 deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6336 bore code work?", "a": "The last two digits of 6336 are bore code 36, giving 36 × 5 = 180 mm bore. The 380 mm outside diameter and 75 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6336 mean?", "a": "A bare 6336 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 180 mm bore?", "a": "The '3' is the medium diameter series: 380×75 mm, 100.0 mm radial section at 180 mm bore, carrying more load than a 6236 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6336?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6336 — the open (unsealed) execution, 180×380×75 mm per ISO 15. Quoted values: C 351 kN, C0 405 kN, Pu 10.4 kN, limiting speed 2200 r/min, mass 36500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6336." } ], "cross_ref": [ { "equiv_sku": "6336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6338", "brand": "SKF", "manufacturer_designation": "SKF 6338", "series": "6300-series", "type": "deep_groove", "d_mm": 190, "D_mm": 400, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 371, "static_load_kN": 430, "fatigue_load_limit_kN": 10.8, "reference_speed_rpm": 3400, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 42000, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 63xx medium series gains rating at 190 mm bore through a 400 mm OD and 78 mm width; the heavier rolling elements also trade away some speed versus a 6238.", "The open 6338 has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6338 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6338-C3. No clearance suffix means normal CN clearance.", "The open 6338 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6338-2Z (shields) and 6338-2RSH (contact seals), not suffix-free 6338.", "The 371/430 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6338 bearing?", "a": "A 6338 deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6338 bore code work?", "a": "The last two digits of 6338 are bore code 38, giving 38 × 5 = 190 mm bore. The 400 mm outside diameter and 78 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6338 mean?", "a": "A bare 6338 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 190 mm bore?", "a": "The '3' is the medium diameter series: 400×78 mm, 105.0 mm radial section at 190 mm bore, carrying more load than a 6238 but needing a larger housing bore and giving up some speed." }, { "q": "What is the SKF designation and catalogue data for 6338?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6338 — the open (unsealed) execution, 190×400×78 mm per ISO 15. Quoted values: C 371 kN, C0 430 kN, Pu 10.8 kN, limiting speed 2200 r/min, mass 42000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6338." } ], "cross_ref": [ { "equiv_sku": "6338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6403", "brand": "SKF", "manufacturer_designation": "SKF 6403", "series": "6400-series", "type": "deep_groove", "d_mm": 17, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 22.9, "static_load_kN": 10.8, "fatigue_load_limit_kN": 0.455, "reference_speed_rpm": 28000, "limiting_speed_rpm": 18000, "max_rpm": 18000, "weight_g": 270, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "small fans and blowers", "garden equipment", "instrument drives", "fractional-horsepower electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).", "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6403 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6403 units.", "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6403 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6403-2Z (shields) and 6403-2RSH (contact seals), not suffix-free 6403.", "The 22.9/10.8 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6403 bearing?", "a": "A 6403 deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Why does 6403 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What does no suffix on 6403 mean?", "a": "A bare 6403 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 17 mm bore?", "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6403?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6403 — the open (unsealed) execution, 17×62×17 mm per ISO 15. Quoted values: C 22.9 kN, C0 10.8 kN, Pu 0.455 kN, limiting speed 18000 r/min, mass 270 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6403." } ], "cross_ref": [ { "equiv_sku": "6403-ZZ", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6403-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6415", "brand": "SKF", "manufacturer_designation": "SKF 6415", "series": "6400-series", "type": "deep_groove", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 153, "static_load_kN": 114, "fatigue_load_limit_kN": 4.15, "reference_speed_rpm": 8000, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 5800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.", "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6415 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×190×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6415 units.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 6415 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6415-2Z (shields) and 6415-2RSH (contact seals), not suffix-free 6415.", "The 153/114 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6415 bearing?", "a": "A 6415 deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6415 bore code work?", "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6415 mean?", "a": "A bare 6415 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 75 mm bore?", "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6415?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6415 — the open (unsealed) execution, 75×190×45 mm per ISO 15. Quoted values: C 153 kN, C0 114 kN, Pu 4.15 kN, limiting speed 5000 r/min, mass 5800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6415." } ], "cross_ref": [ { "equiv_sku": "6415-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6415-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6416", "brand": "SKF", "manufacturer_designation": "SKF 6416", "series": "6400-series", "type": "deep_groove", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 163, "static_load_kN": 125, "fatigue_load_limit_kN": 4.5, "reference_speed_rpm": 7500, "limiting_speed_rpm": 4800, "max_rpm": 4800, "weight_g": 6850, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6416 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×200×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6416 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6416 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6416-2Z (shields) and 6416-2RSH (contact seals), not suffix-free 6416.", "The 163/125 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6416 bearing?", "a": "A 6416 deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6416 bore code work?", "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6416 mean?", "a": "A bare 6416 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 80 mm bore?", "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6416?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6416 — the open (unsealed) execution, 80×200×48 mm per ISO 15. Quoted values: C 163 kN, C0 125 kN, Pu 4.5 kN, limiting speed 4800 r/min, mass 6850 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6416." } ], "cross_ref": [ { "equiv_sku": "6416-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6416-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-25", "confidence_score": 0.85, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6417", "brand": "SKF", "manufacturer_designation": "SKF 6417", "series": "6400-series", "type": "deep_groove", "d_mm": 85, "D_mm": 210, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 174, "static_load_kN": 137, "fatigue_load_limit_kN": 4.75, "reference_speed_rpm": 7000, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 8050, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6417 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×210×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6417 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6417.", "The open 6417 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6417-2Z (shields) and 6417-2RSH (contact seals), not suffix-free 6417.", "The 174/137 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6417 bearing?", "a": "A 6417 deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6417 bore code work?", "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6417 mean?", "a": "A bare 6417 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 85 mm bore?", "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6417?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6417 — the open (unsealed) execution, 85×210×52 mm per ISO 15. Quoted values: C 174 kN, C0 137 kN, Pu 4.75 kN, limiting speed 4500 r/min, mass 8050 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6417." } ], "cross_ref": [ { "equiv_sku": "6417-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6417-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "6418", "brand": "SKF", "manufacturer_designation": "SKF 6418", "series": "6400-series", "type": "deep_groove", "d_mm": 90, "D_mm": 225, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 186, "static_load_kN": 150, "fatigue_load_limit_kN": 5, "reference_speed_rpm": 6700, "limiting_speed_rpm": 4300, "max_rpm": 4300, "weight_g": 9800, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.", "The open 6418 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×225×54 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6418 units.", "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 6418 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6418-2Z (shields) and 6418-2RSH (contact seals), not suffix-free 6418.", "The 186/150 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives." ], "faq": [ { "q": "What are the dimensions of a 6418 bearing?", "a": "A 6418 deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6418 bore code work?", "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6418 mean?", "a": "A bare 6418 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6400 compare with other series at the same 90 mm bore?", "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts." }, { "q": "What is the SKF designation and catalogue data for 6418?", "a": "In the SKF Rolling Bearings catalogue this size is listed as 6418 — the open (unsealed) execution, 90×225×54 mm per ISO 15. Quoted values: C 186 kN, C0 150 kN, Pu 5 kN, limiting speed 4300 r/min, mass 9800 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6418." } ], "cross_ref": [ { "equiv_sku": "6418-ZZ", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty." }, { "equiv_sku": "6418-2RS", "equiv_brand": "GENERIC-ISO", "level": "partial", "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "22205", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 150, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22205 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 15 envelope is 52 mm outside diameter and 18 mm width — 0.984 × 2.047 × 0.709 in, with a 13.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "light-duty gearbox output shafts", "small conveyor idler and pulley rolls", "light vibrating screens and sifters", "agricultural elevator and feeder shafts", "small industrial fan rotors" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "At 25 mm bore the small 22205 is often delivered sealed (2CS) and grease-filled for life in conveyor idlers — do not add grease nipples to a sealed row; for the open version, keep housing seals effective because the 18 mm cavity holds little oil reserve.", "The 222 medium series at 25 mm bore (52×18 mm, 13.5 mm section) is the default general-purpose spherical row; on the same bore a 22305 is larger and wider with far higher load rating — do not swap a failed 22305 down to a 22205 without re-rating life.", "Check the shoulder geometry for 22205: a generous fillet on the 25 mm shaft looks strong but stops the 18 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 13.5 mm-section outer ring presses flush in the 52 mm housing.", "Large 22205 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 18 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22205, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 25 mm journal must be replaced, or the new bearing frets the same seat.", "Press 22205 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 52 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22205 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 22205 spherical roller bearing?", "a": "A 22205 double-row spherical roller bearing per ISO 15 has a 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in), a 13.5 mm radial section and roughly 150 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22205 bore code work?", "a": "The leading 2 in 22205 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 05: 05 × 5 = 25 mm. The 52 mm OD and 18 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22205 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22205 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22205 and 22205K?", "a": "The plain 22205 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22205 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22205K", "22205-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22206", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 236, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22206 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 15 envelope is 62 mm outside diameter and 20 mm width — 1.181 × 2.441 × 0.787 in, with a 16.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "small conveyor idler and pulley rolls", "light vibrating screens and sifters", "agricultural elevator and feeder shafts", "small industrial fan rotors", "textile and packaging machinery rolls" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "At 30 mm bore the small 22206 is often delivered sealed (2CS) and grease-filled for life in conveyor idlers — do not add grease nipples to a sealed row; for the open version, keep housing seals effective because the 20 mm cavity holds little oil reserve.", "The 222 medium series at 30 mm bore (62×20 mm, 16.0 mm section) is the default general-purpose spherical row; on the same bore a 22306 is larger and wider with far higher load rating — do not swap a failed 22306 down to a 22206 without re-rating life.", "The 20 mm-wide 22206 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 62 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 16.0 mm section.", "For a cylindrical-bore 22206, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 30 mm shaft; cooling creates the interference, while hammering cold through the 62 mm assembly dents the sphered raceways.", "Relubricate 22206 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 20 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 30 mm bore starved.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22206 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 22206 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 22206 spherical roller bearing?", "a": "A 22206 double-row spherical roller bearing per ISO 15 has a 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in), a 16.0 mm radial section and roughly 236 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22206 bore code work?", "a": "The leading 2 in 22206 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 06: 06 × 5 = 30 mm. The 62 mm OD and 20 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22206 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22206 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22206 and 22206K?", "a": "The plain 22206 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22206 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22206K", "22206-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22207", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 365, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22207 encode the bore: code 07 = 35 mm (code × 5 from 04 upward). The ISO 15 envelope is 72 mm outside diameter and 23 mm width — 1.378 × 2.835 × 0.906 in, with a 18.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "light vibrating screens and sifters", "agricultural elevator and feeder shafts", "small industrial fan rotors", "textile and packaging machinery rolls", "light-duty gearbox output shafts" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "At 35 mm bore the small 22207 is often delivered sealed (2CS) and grease-filled for life in conveyor idlers — do not add grease nipples to a sealed row; for the open version, keep housing seals effective because the 23 mm cavity holds little oil reserve.", "The 222 medium series at 35 mm bore (72×23 mm, 18.5 mm section) is the default general-purpose spherical row; on the same bore a 22307 is larger and wider with far higher load rating — do not swap a failed 22307 down to a 22207 without re-rating life.", "Before fitting 22207, machine the 35 mm shaft seat and 72 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 23 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 18.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22207 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 35 mm seat cannot creep.", "Read the damage pattern on a removed 22207: spalling concentrated on one side of the 72 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "In a classic two-bearing arrangement the 22207 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 22207 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 22207 spherical roller bearing?", "a": "A 22207 double-row spherical roller bearing per ISO 15 has a 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in), a 18.5 mm radial section and roughly 365 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22207 bore code work?", "a": "The leading 2 in 22207 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 07: 07 × 5 = 35 mm. The 72 mm OD and 23 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22207 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22207 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22207 and 22207K?", "a": "The plain 22207 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22207 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22207K", "22207-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22208", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 442, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22208 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 80 mm outside diameter and 23 mm width — 1.575 × 3.15 × 0.906 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "On this 40 mm-bore 22208, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 40 mm shaft.", "The 222 medium series at 40 mm bore (80×23 mm, 20.0 mm section) is the default general-purpose spherical row; on the same bore a 22308 is larger and wider with far higher load rating — do not swap a failed 22308 down to a 22208 without re-rating life.", "Check the shoulder geometry for 22208: a generous fillet on the 40 mm shaft looks strong but stops the 23 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section outer ring presses flush in the 80 mm housing.", "Large 22208 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 23 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22208, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 40 mm journal must be replaced, or the new bearing frets the same seat.", "Self-aligning is not a licence to ignore alignment: 22208 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22208 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 22208 spherical roller bearing?", "a": "A 22208 double-row spherical roller bearing per ISO 15 has a 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in), a 20.0 mm radial section and roughly 442 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22208 bore code work?", "a": "The leading 2 in 22208 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 08: 08 × 5 = 40 mm. The 80 mm OD and 23 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22208 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22208 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22208 and 22208K?", "a": "The plain 22208 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22208 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22208K", "22208-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22209", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 479, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22209 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 85 mm outside diameter and 23 mm width — 1.772 × 3.346 × 0.906 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "On this 45 mm-bore 22209, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 45 mm shaft.", "The 222 medium series at 45 mm bore (85×23 mm, 20.0 mm section) is the default general-purpose spherical row; on the same bore a 22309 is larger and wider with far higher load rating — do not swap a failed 22309 down to a 22209 without re-rating life.", "The 23 mm-wide 22209 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 85 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "For a cylindrical-bore 22209, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 45 mm shaft; cooling creates the interference, while hammering cold through the 85 mm assembly dents the sphered raceways.", "Relubricate 22209 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 23 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 45 mm bore starved.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22209 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 22209 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 22209 spherical roller bearing?", "a": "A 22209 double-row spherical roller bearing per ISO 15 has a 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in), a 20.0 mm radial section and roughly 479 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22209 bore code work?", "a": "The leading 2 in 22209 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 09: 09 × 5 = 45 mm. The 85 mm OD and 23 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22209 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22209 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22209 and 22209K?", "a": "The plain 22209 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22209 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22209K", "22209-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22210", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 516, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22210 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 23 mm width — 1.969 × 3.543 × 0.906 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "On this 50 mm-bore 22210, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 50 mm shaft.", "The 222 medium series at 50 mm bore (90×23 mm, 20.0 mm section) is the default general-purpose spherical row; on the same bore a 22310 is larger and wider with far higher load rating — do not swap a failed 22310 down to a 22210 without re-rating life.", "Before fitting 22210, machine the 50 mm shaft seat and 90 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 23 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 20.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22210 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 50 mm seat cannot creep.", "Read the damage pattern on a removed 22210: spalling concentrated on one side of the 90 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Choose the bore type deliberately: plain 22210 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 50 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 22210 spherical roller bearing?", "a": "A 22210 double-row spherical roller bearing per ISO 15 has a 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in), a 20.0 mm radial section and roughly 516 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22210 bore code work?", "a": "The leading 2 in 22210 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 10: 10 × 5 = 50 mm. The 90 mm OD and 23 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22210 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22210 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22210 and 22210K?", "a": "The plain 22210 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22210 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22210K", "22210-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22211", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 699, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22211 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 25 mm width — 2.165 × 3.937 × 0.984 in, with a 22.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "On this 55 mm-bore 22211, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 55 mm shaft.", "The 222 medium series at 55 mm bore (100×25 mm, 22.5 mm section) is the default general-purpose spherical row; on the same bore a 22311 is larger and wider with far higher load rating — do not swap a failed 22311 down to a 22211 without re-rating life.", "Check the shoulder geometry for 22211: a generous fillet on the 55 mm shaft looks strong but stops the 25 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section outer ring presses flush in the 100 mm housing.", "Large 22211 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 25 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22211, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 55 mm journal must be replaced, or the new bearing frets the same seat.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 55 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 25 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 22211 spherical roller bearing?", "a": "A 22211 double-row spherical roller bearing per ISO 15 has a 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in), a 22.5 mm radial section and roughly 699 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22211 bore code work?", "a": "The leading 2 in 22211 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 11: 11 × 5 = 55 mm. The 100 mm OD and 25 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22211 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22211 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22211 and 22211K?", "a": "The plain 22211 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22211 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22211K", "22211-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22212", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 954, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22212 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 28 mm width — 2.362 × 4.331 × 1.102 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "On this 60 mm-bore 22212, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 60 mm shaft.", "The 222 medium series at 60 mm bore (110×28 mm, 25.0 mm section) is the default general-purpose spherical row; on the same bore a 22312 is larger and wider with far higher load rating — do not swap a failed 22312 down to a 22212 without re-rating life.", "The 28 mm-wide 22212 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 110 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "For a cylindrical-bore 22212, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 60 mm shaft; cooling creates the interference, while hammering cold through the 110 mm assembly dents the sphered raceways.", "Relubricate 22212 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 28 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 60 mm bore starved.", "Specify W33 when the 28 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 22212 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 110 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 22212 spherical roller bearing?", "a": "A 22212 double-row spherical roller bearing per ISO 15 has a 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in), a 25.0 mm radial section and roughly 954 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22212 bore code work?", "a": "The leading 2 in 22212 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 12: 12 × 5 = 60 mm. The 110 mm OD and 28 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22212 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22212 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22212 and 22212K?", "a": "The plain 22212 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22212 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22212K", "22212-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22213", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1264, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22213 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 31 mm width — 2.559 × 4.724 × 1.22 in, with a 27.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "On this 65 mm-bore 22213, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 65 mm shaft.", "The 222 medium series at 65 mm bore (120×31 mm, 27.5 mm section) is the default general-purpose spherical row; on the same bore a 22313 is larger and wider with far higher load rating — do not swap a failed 22313 down to a 22213 without re-rating life.", "Before fitting 22213, machine the 65 mm shaft seat and 120 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 31 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 27.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22213 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 65 mm seat cannot creep.", "Read the damage pattern on a removed 22213: spalling concentrated on one side of the 120 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Press 22213 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 120 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22213 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 22213 spherical roller bearing?", "a": "A 22213 double-row spherical roller bearing per ISO 15 has a 65 mm bore, 120 mm outer diameter and 31 mm width (2.559 × 4.724 × 1.22 in), a 27.5 mm radial section and roughly 1264 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22213 bore code work?", "a": "The leading 2 in 22213 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 13: 13 × 5 = 65 mm. The 120 mm OD and 31 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22213 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22213 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22213 and 22213K?", "a": "The plain 22213 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22213 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22213K", "22213-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22214", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1332, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22214 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 125 mm outside diameter and 31 mm width — 2.756 × 4.921 × 1.22 in, with a 27.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "On this 70 mm-bore 22214, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 70 mm shaft.", "The 222 medium series at 70 mm bore (125×31 mm, 27.5 mm section) is the default general-purpose spherical row; on the same bore a 22314 is larger and wider with far higher load rating — do not swap a failed 22314 down to a 22214 without re-rating life.", "Check the shoulder geometry for 22214: a generous fillet on the 70 mm shaft looks strong but stops the 31 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 27.5 mm-section outer ring presses flush in the 125 mm housing.", "Large 22214 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 31 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22214, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 70 mm journal must be replaced, or the new bearing frets the same seat.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22214 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 22214 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 22214 spherical roller bearing?", "a": "A 22214 double-row spherical roller bearing per ISO 15 has a 70 mm bore, 125 mm outer diameter and 31 mm width (2.756 × 4.921 × 1.22 in), a 27.5 mm radial section and roughly 1332 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22214 bore code work?", "a": "The leading 2 in 22214 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 14: 14 × 5 = 70 mm. The 125 mm OD and 31 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22214 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22214 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22214 and 22214K?", "a": "The plain 22214 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22214 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22214K", "22214-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22215", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1401, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22215 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 31 mm width — 2.953 × 5.118 × 1.22 in, with a 27.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "On this 75 mm-bore 22215, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 75 mm shaft.", "The 222 medium series at 75 mm bore (130×31 mm, 27.5 mm section) is the default general-purpose spherical row; on the same bore a 22315 is larger and wider with far higher load rating — do not swap a failed 22315 down to a 22215 without re-rating life.", "The 31 mm-wide 22215 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 130 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "For a cylindrical-bore 22215, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 75 mm shaft; cooling creates the interference, while hammering cold through the 130 mm assembly dents the sphered raceways.", "Relubricate 22215 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 31 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 75 mm bore starved.", "In a classic two-bearing arrangement the 22215 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 22215 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 22215 spherical roller bearing?", "a": "A 22215 double-row spherical roller bearing per ISO 15 has a 75 mm bore, 130 mm outer diameter and 31 mm width (2.953 × 5.118 × 1.22 in), a 27.5 mm radial section and roughly 1401 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22215 bore code work?", "a": "The leading 2 in 22215 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 15: 15 × 5 = 75 mm. The 130 mm OD and 31 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22215 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22215 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22215 and 22215K?", "a": "The plain 22215 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22215 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22215K", "22215-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22216", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1746, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22216 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 33 mm width — 3.15 × 5.512 × 1.299 in, with a 30.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "The large 80 mm-bore 22216 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 33 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 80 mm bore (140×33 mm, 30.0 mm section) is the default general-purpose spherical row; on the same bore a 22316 is larger and wider with far higher load rating — do not swap a failed 22316 down to a 22216 without re-rating life.", "Before fitting 22216, machine the 80 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 33 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22216 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.", "Read the damage pattern on a removed 22216: spalling concentrated on one side of the 140 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Self-aligning is not a licence to ignore alignment: 22216 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22216 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 22216 spherical roller bearing?", "a": "A 22216 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 140 mm outer diameter and 33 mm width (3.15 × 5.512 × 1.299 in), a 30.0 mm radial section and roughly 1746 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22216 bore code work?", "a": "The leading 2 in 22216 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 140 mm OD and 33 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22216 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22216 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22216 and 22216K?", "a": "The plain 22216 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22216 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22216K", "22216-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22217", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2204, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22217 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 36 mm width — 3.346 × 5.906 × 1.417 in, with a 32.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 85 mm-bore 22217 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 36 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 85 mm bore (150×36 mm, 32.5 mm section) is the default general-purpose spherical row; on the same bore a 22317 is larger and wider with far higher load rating — do not swap a failed 22317 down to a 22217 without re-rating life.", "Check the shoulder geometry for 22217: a generous fillet on the 85 mm shaft looks strong but stops the 36 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section outer ring presses flush in the 150 mm housing.", "Large 22217 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 36 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22217, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 85 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22217 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 22217 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 22217 spherical roller bearing?", "a": "A 22217 double-row spherical roller bearing per ISO 15 has a 85 mm bore, 150 mm outer diameter and 36 mm width (3.346 × 5.906 × 1.417 in), a 32.5 mm radial section and roughly 2204 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22217 bore code work?", "a": "The leading 2 in 22217 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 17: 17 × 5 = 85 mm. The 150 mm OD and 36 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22217 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22217 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22217 and 22217K?", "a": "The plain 22217 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22217 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22217K", "22217-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22218", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2805, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22218 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 160 mm outside diameter and 40 mm width — 3.543 × 6.299 × 1.575 in, with a 35.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "The large 90 mm-bore 22218 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 40 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 90 mm bore (160×40 mm, 35.0 mm section) is the default general-purpose spherical row; on the same bore a 22318 is larger and wider with far higher load rating — do not swap a failed 22318 down to a 22218 without re-rating life.", "The 40 mm-wide 22218 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 160 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "For a cylindrical-bore 22218, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 160 mm assembly dents the sphered raceways.", "Relubricate 22218 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 40 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 90 mm bore starved.", "Choose the bore type deliberately: plain 22218 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 90 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 22218 spherical roller bearing?", "a": "A 22218 double-row spherical roller bearing per ISO 15 has a 90 mm bore, 160 mm outer diameter and 40 mm width (3.543 × 6.299 × 1.575 in), a 35.0 mm radial section and roughly 2805 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22218 bore code work?", "a": "The leading 2 in 22218 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 18: 18 × 5 = 90 mm. The 160 mm OD and 40 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22218 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22218 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22218 and 22218K?", "a": "The plain 22218 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22218 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22218K", "22218-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22219", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3425, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22219 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 43 mm width — 3.74 × 6.693 × 1.693 in, with a 37.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 95 mm-bore 22219 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 43 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 95 mm bore (170×43 mm, 37.5 mm section) is the default general-purpose spherical row; on the same bore a 22319 is larger and wider with far higher load rating — do not swap a failed 22319 down to a 22219 without re-rating life.", "Before fitting 22219, machine the 95 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 43 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22219 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 95 mm seat cannot creep.", "Read the damage pattern on a removed 22219: spalling concentrated on one side of the 170 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 95 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 43 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 22219 spherical roller bearing?", "a": "A 22219 double-row spherical roller bearing per ISO 15 has a 95 mm bore, 170 mm outer diameter and 43 mm width (3.74 × 6.693 × 1.693 in), a 37.5 mm radial section and roughly 3425 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22219 bore code work?", "a": "The leading 2 in 22219 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 19: 19 × 5 = 95 mm. The 170 mm OD and 43 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22219 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22219 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22219 and 22219K?", "a": "The plain 22219 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22219 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22219K", "22219-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22220", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4129, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22220 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 46 mm width — 3.937 × 7.087 × 1.811 in, with a 40.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 100 mm-bore 22220 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 46 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 100 mm bore (180×46 mm, 40.0 mm section) is the default general-purpose spherical row; on the same bore a 22320 is larger and wider with far higher load rating — do not swap a failed 22320 down to a 22220 without re-rating life.", "Check the shoulder geometry for 22220: a generous fillet on the 100 mm shaft looks strong but stops the 46 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section outer ring presses flush in the 180 mm housing.", "Large 22220 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 46 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22220, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 100 mm journal must be replaced, or the new bearing frets the same seat.", "Specify W33 when the 46 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 22220 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 180 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 22220 spherical roller bearing?", "a": "A 22220 double-row spherical roller bearing per ISO 15 has a 100 mm bore, 180 mm outer diameter and 46 mm width (3.937 × 7.087 × 1.811 in), a 40.0 mm radial section and roughly 4129 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22220 bore code work?", "a": "The leading 2 in 22220 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 20: 20 × 5 = 100 mm. The 180 mm OD and 46 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22220 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22220 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22220 and 22220K?", "a": "The plain 22220 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22220 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22220K", "22220-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22222", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5926, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22222 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 15 envelope is 200 mm outside diameter and 53 mm width — 4.331 × 7.874 × 2.087 in, with a 45.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "The large 110 mm-bore 22222 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 53 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 110 mm bore (200×53 mm, 45.0 mm section) is the default general-purpose spherical row; on the same bore a 22322 is larger and wider with far higher load rating — do not swap a failed 22322 down to a 22222 without re-rating life.", "Before fitting 22222, machine the 110 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 53 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22222 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 110 mm seat cannot creep.", "Read the damage pattern on a removed 22222: spalling concentrated on one side of the 200 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22222 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 22222 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 22222 spherical roller bearing?", "a": "A 22222 double-row spherical roller bearing per ISO 15 has a 110 mm bore, 200 mm outer diameter and 53 mm width (4.331 × 7.874 × 2.087 in), a 45.0 mm radial section and roughly 5926 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22222 bore code work?", "a": "The leading 2 in 22222 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 22: 22 × 5 = 110 mm. The 200 mm OD and 53 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22222 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22222 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22222 and 22222K?", "a": "The plain 22222 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22222 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22222K", "22222-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22224", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7397, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22224 encode the bore: code 24 = 120 mm (code × 5 from 04 upward). The ISO 15 envelope is 215 mm outside diameter and 58 mm width — 4.724 × 8.465 × 2.283 in, with a 47.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "The large 120 mm-bore 22224 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 58 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 120 mm bore (215×58 mm, 47.5 mm section) is the default general-purpose spherical row; on the same bore a 22324 is larger and wider with far higher load rating — do not swap a failed 22324 down to a 22224 without re-rating life.", "The 58 mm-wide 22224 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 120 mm bore and 215 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 47.5 mm section.", "For a cylindrical-bore 22224, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 120 mm shaft; cooling creates the interference, while hammering cold through the 215 mm assembly dents the sphered raceways.", "Relubricate 22224 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 58 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 120 mm bore starved.", "Self-aligning is not a licence to ignore alignment: 22224 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22224 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 22224 spherical roller bearing?", "a": "A 22224 double-row spherical roller bearing per ISO 15 has a 120 mm bore, 215 mm outer diameter and 58 mm width (4.724 × 8.465 × 2.283 in), a 47.5 mm radial section and roughly 7397 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22224 bore code work?", "a": "The leading 2 in 22224 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 24: 24 × 5 = 120 mm. The 215 mm OD and 58 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22224 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22224 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22224 and 22224K?", "a": "The plain 22224 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22224 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22224K", "22224-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22226", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9233, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22226 encode the bore: code 26 = 130 mm (code × 5 from 04 upward). The ISO 15 envelope is 230 mm outside diameter and 64 mm width — 5.118 × 9.055 × 2.52 in, with a 50.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "The large 130 mm-bore 22226 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 64 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 130 mm bore (230×64 mm, 50.0 mm section) is the default general-purpose spherical row; on the same bore a 22326 is larger and wider with far higher load rating — do not swap a failed 22326 down to a 22226 without re-rating life.", "Check the shoulder geometry for 22226: a generous fillet on the 130 mm shaft looks strong but stops the 64 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 50.0 mm-section outer ring presses flush in the 230 mm housing.", "Large 22226 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 64 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22226, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 130 mm journal must be replaced, or the new bearing frets the same seat.", "Choose the bore type deliberately: plain 22226 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 130 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 22226 spherical roller bearing?", "a": "A 22226 double-row spherical roller bearing per ISO 15 has a 130 mm bore, 230 mm outer diameter and 64 mm width (5.118 × 9.055 × 2.52 in), a 50.0 mm radial section and roughly 9233 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22226 bore code work?", "a": "The leading 2 in 22226 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 26: 26 × 5 = 130 mm. The 230 mm OD and 64 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22226 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22226 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22226 and 22226K?", "a": "The plain 22226 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22226 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22226K", "22226-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22228", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 11691, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22228 encode the bore: code 28 = 140 mm (code × 5 from 04 upward). The ISO 15 envelope is 250 mm outside diameter and 68 mm width — 5.512 × 9.843 × 2.677 in, with a 55.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 140 mm-bore 22228 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 68 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 140 mm bore (250×68 mm, 55.0 mm section) is the default general-purpose spherical row; on the same bore a 22328 is larger and wider with far higher load rating — do not swap a failed 22328 down to a 22228 without re-rating life.", "Before fitting 22228, machine the 140 mm shaft seat and 250 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 68 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 55.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22228 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 140 mm seat cannot creep.", "Read the damage pattern on a removed 22228: spalling concentrated on one side of the 250 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Specify W33 when the 68 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 22228 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 250 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 22228 spherical roller bearing?", "a": "A 22228 double-row spherical roller bearing per ISO 15 has a 140 mm bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in), a 55.0 mm radial section and roughly 11691 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22228 bore code work?", "a": "The leading 2 in 22228 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 28: 28 × 5 = 140 mm. The 250 mm OD and 68 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22228 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22228 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22228 and 22228K?", "a": "The plain 22228 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22228 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22228K", "22228-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22230", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 14744, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22230 encode the bore: code 30 = 150 mm (code × 5 from 04 upward). The ISO 15 envelope is 270 mm outside diameter and 73 mm width — 5.906 × 10.63 × 2.874 in, with a 60.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "The large 150 mm-bore 22230 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 73 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 150 mm bore (270×73 mm, 60.0 mm section) is the default general-purpose spherical row; on the same bore a 22330 is larger and wider with far higher load rating — do not swap a failed 22330 down to a 22230 without re-rating life.", "The 73 mm-wide 22230 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 150 mm bore and 270 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 60.0 mm section.", "For a cylindrical-bore 22230, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 150 mm shaft; cooling creates the interference, while hammering cold through the 270 mm assembly dents the sphered raceways.", "Relubricate 22230 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 73 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 150 mm bore starved.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22230 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 22230 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 22230 spherical roller bearing?", "a": "A 22230 double-row spherical roller bearing per ISO 15 has a 150 mm bore, 270 mm outer diameter and 73 mm width (5.906 × 10.63 × 2.874 in), a 60.0 mm radial section and roughly 14744 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22230 bore code work?", "a": "The leading 2 in 22230 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 30: 30 × 5 = 150 mm. The 270 mm OD and 73 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22230 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22230 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22230 and 22230K?", "a": "The plain 22230 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22230 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22230K", "22230-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22232", "brand": "GENERIC-ISO", "series": "22200-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 18755, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22200-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22232 encode the bore: code 32 = 160 mm (code × 5 from 04 upward). The ISO 15 envelope is 290 mm outside diameter and 80 mm width — 6.299 × 11.417 × 3.15 in, with a 65.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "The large 160 mm-bore 22232 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 80 mm double-row assembly cannot be drifted into position without brinelling.", "The 222 medium series at 160 mm bore (290×80 mm, 65.0 mm section) is the default general-purpose spherical row; on the same bore a 22332 is larger and wider with far higher load rating — do not swap a failed 22332 down to a 22232 without re-rating life.", "Check the shoulder geometry for 22232: a generous fillet on the 160 mm shaft looks strong but stops the 80 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 65.0 mm-section outer ring presses flush in the 290 mm housing.", "Large 22232 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 80 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 22232, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 160 mm journal must be replaced, or the new bearing frets the same seat.", "Self-aligning is not a licence to ignore alignment: 22232 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22232 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 22232 spherical roller bearing?", "a": "A 22232 double-row spherical roller bearing per ISO 15 has a 160 mm bore, 290 mm outer diameter and 80 mm width (6.299 × 11.417 × 3.15 in), a 65.0 mm radial section and roughly 18755 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22232 bore code work?", "a": "The leading 2 in 22232 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 32: 32 × 5 = 160 mm. The 290 mm OD and 80 mm width come from the dimension series (22200), not from the bore code alone." }, { "q": "How much misalignment can a 22232 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22232 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22232 and 22232K?", "a": "The plain 22232 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22232 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22232K", "22232-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22308", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 860, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22308 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 15 envelope is 90 mm outside diameter and 33 mm width — 1.575 × 3.543 × 1.299 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "On this 40 mm-bore 22308, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 40 mm shaft.", "The 223 heavy wide series at 40 mm bore (90×33 mm) is selected for shock and high radial load in screens and crushers; its 25.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22208 on the same journal.", "Check the shoulder geometry for 22308: a generous fillet on the 40 mm shaft looks strong but stops the 33 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 25.0 mm-section outer ring presses flush in the 90 mm housing.", "Large 22308 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 33 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22308 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 33 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 40 mm bore starved.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22308 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 22308 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 22308 spherical roller bearing?", "a": "A 22308 double-row spherical roller bearing per ISO 15 has a 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in), a 25.0 mm radial section and roughly 860 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22308 bore code work?", "a": "The leading 2 in 22308 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 08: 08 × 5 = 40 mm. The 90 mm OD and 33 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22308 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22308 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22308 and 22308K?", "a": "The plain 22308 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22308 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22308K", "22308-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22309", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1151, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22309 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 15 envelope is 100 mm outside diameter and 36 mm width — 1.772 × 3.937 × 1.417 in, with a 27.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "On this 45 mm-bore 22309, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 45 mm shaft.", "The 223 heavy wide series at 45 mm bore (100×36 mm) is selected for shock and high radial load in screens and crushers; its 27.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22209 on the same journal.", "The 36 mm-wide 22309 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 100 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "For a cylindrical-bore 22309, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 45 mm shaft; cooling creates the interference, while hammering cold through the 100 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22309: spalling concentrated on one side of the 100 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Choose the bore type deliberately: plain 22309 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 45 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 22309 spherical roller bearing?", "a": "A 22309 double-row spherical roller bearing per ISO 15 has a 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in), a 27.5 mm radial section and roughly 1151 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22309 bore code work?", "a": "The leading 2 in 22309 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 09: 09 × 5 = 45 mm. The 100 mm OD and 36 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22309 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22309 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22309 and 22309K?", "a": "The plain 22309 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22309 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22309K", "22309-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22310", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1539, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22310 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 40 mm width — 1.969 × 4.331 × 1.575 in, with a 30.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "On this 50 mm-bore 22310, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 50 mm shaft.", "The 223 heavy wide series at 50 mm bore (110×40 mm) is selected for shock and high radial load in screens and crushers; its 30.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22210 on the same journal.", "Before fitting 22310, machine the 50 mm shaft seat and 110 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 40 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22310 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 50 mm seat cannot creep.", "When reusing a sleeve-mounted 22310, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 50 mm journal must be replaced, or the new bearing frets the same seat.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 50 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 40 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 22310 spherical roller bearing?", "a": "A 22310 double-row spherical roller bearing per ISO 15 has a 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in), a 30.0 mm radial section and roughly 1539 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22310 bore code work?", "a": "The leading 2 in 22310 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 10: 10 × 5 = 50 mm. The 110 mm OD and 40 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22310 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22310 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22310 and 22310K?", "a": "The plain 22310 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22310 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22310K", "22310-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22311", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1960, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22311 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 43 mm width — 2.165 × 4.724 × 1.693 in, with a 32.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "On this 55 mm-bore 22311, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 55 mm shaft.", "The 223 heavy wide series at 55 mm bore (120×43 mm) is selected for shock and high radial load in screens and crushers; its 32.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22211 on the same journal.", "Check the shoulder geometry for 22311: a generous fillet on the 55 mm shaft looks strong but stops the 43 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section outer ring presses flush in the 120 mm housing.", "Large 22311 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 43 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22311 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 43 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 55 mm bore starved.", "Specify W33 when the 43 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 22311 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 120 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 22311 spherical roller bearing?", "a": "A 22311 double-row spherical roller bearing per ISO 15 has a 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in), a 32.5 mm radial section and roughly 1960 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22311 bore code work?", "a": "The leading 2 in 22311 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 11: 11 × 5 = 55 mm. The 120 mm OD and 43 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22311 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22311 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22311 and 22311K?", "a": "The plain 22311 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22311 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22311K", "22311-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22312", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2452, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22312 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 46 mm width — 2.362 × 5.118 × 1.811 in, with a 35.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "On this 60 mm-bore 22312, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 60 mm shaft.", "The 223 heavy wide series at 60 mm bore (130×46 mm) is selected for shock and high radial load in screens and crushers; its 35.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22212 on the same journal.", "The 46 mm-wide 22312 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 130 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "For a cylindrical-bore 22312, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 60 mm shaft; cooling creates the interference, while hammering cold through the 130 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22312: spalling concentrated on one side of the 130 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Press 22312 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 130 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22312 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 22312 spherical roller bearing?", "a": "A 22312 double-row spherical roller bearing per ISO 15 has a 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in), a 35.0 mm radial section and roughly 2452 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22312 bore code work?", "a": "The leading 2 in 22312 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 12: 12 × 5 = 60 mm. The 130 mm OD and 46 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22312 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22312 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22312 and 22312K?", "a": "The plain 22312 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22312 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22312K", "22312-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22313", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2958, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22313 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 48 mm width — 2.559 × 5.512 × 1.89 in, with a 37.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "On this 65 mm-bore 22313, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 65 mm shaft.", "The 223 heavy wide series at 65 mm bore (140×48 mm) is selected for shock and high radial load in screens and crushers; its 37.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22213 on the same journal.", "Before fitting 22313, machine the 65 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 48 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22313 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 65 mm seat cannot creep.", "When reusing a sleeve-mounted 22313, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 65 mm journal must be replaced, or the new bearing frets the same seat.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22313 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 22313 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 22313 spherical roller bearing?", "a": "A 22313 double-row spherical roller bearing per ISO 15 has a 65 mm bore, 140 mm outer diameter and 48 mm width (2.559 × 5.512 × 1.89 in), a 37.5 mm radial section and roughly 2958 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22313 bore code work?", "a": "The leading 2 in 22313 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 13: 13 × 5 = 65 mm. The 140 mm OD and 48 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22313 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22313 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22313 and 22313K?", "a": "The plain 22313 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22313 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22313K", "22313-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22314", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3597, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22314 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 51 mm width — 2.756 × 5.906 × 2.008 in, with a 40.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "On this 70 mm-bore 22314, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 70 mm shaft.", "The 223 heavy wide series at 70 mm bore (150×51 mm) is selected for shock and high radial load in screens and crushers; its 40.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22214 on the same journal.", "Check the shoulder geometry for 22314: a generous fillet on the 70 mm shaft looks strong but stops the 51 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section outer ring presses flush in the 150 mm housing.", "Large 22314 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 51 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22314 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 51 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 70 mm bore starved.", "In a classic two-bearing arrangement the 22314 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 22314 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 22314 spherical roller bearing?", "a": "A 22314 double-row spherical roller bearing per ISO 15 has a 70 mm bore, 150 mm outer diameter and 51 mm width (2.756 × 5.906 × 2.008 in), a 40.0 mm radial section and roughly 3597 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22314 bore code work?", "a": "The leading 2 in 22314 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 14: 14 × 5 = 70 mm. The 150 mm OD and 51 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22314 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22314 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22314 and 22314K?", "a": "The plain 22314 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22314 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22314K", "22314-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22315", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4403, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22315 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 160 mm outside diameter and 55 mm width — 2.953 × 6.299 × 2.165 in, with a 42.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "On this 75 mm-bore 22315, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 75 mm shaft.", "The 223 heavy wide series at 75 mm bore (160×55 mm) is selected for shock and high radial load in screens and crushers; its 42.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22215 on the same journal.", "The 55 mm-wide 22315 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 160 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 42.5 mm section.", "For a cylindrical-bore 22315, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 75 mm shaft; cooling creates the interference, while hammering cold through the 160 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22315: spalling concentrated on one side of the 160 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Self-aligning is not a licence to ignore alignment: 22315 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22315 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 22315 spherical roller bearing?", "a": "A 22315 double-row spherical roller bearing per ISO 15 has a 75 mm bore, 160 mm outer diameter and 55 mm width (2.953 × 6.299 × 2.165 in), a 42.5 mm radial section and roughly 4403 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22315 bore code work?", "a": "The leading 2 in 22315 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 15: 15 × 5 = 75 mm. The 160 mm OD and 55 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22315 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22315 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22315 and 22315K?", "a": "The plain 22315 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22315 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22315K", "22315-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22316", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5230, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22316 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 58 mm width — 3.15 × 6.693 × 2.283 in, with a 45.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 80 mm-bore 22316 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 58 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 80 mm bore (170×58 mm) is selected for shock and high radial load in screens and crushers; its 45.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22216 on the same journal.", "Before fitting 22316, machine the 80 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 58 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22316 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.", "When reusing a sleeve-mounted 22316, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 80 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22316 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 22316 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 22316 spherical roller bearing?", "a": "A 22316 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 170 mm outer diameter and 58 mm width (3.15 × 6.693 × 2.283 in), a 45.0 mm radial section and roughly 5230 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22316 bore code work?", "a": "The leading 2 in 22316 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 170 mm OD and 58 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22316 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22316 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22316 and 22316K?", "a": "The plain 22316 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22316 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22316K", "22316-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22317", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6053, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22317 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 60 mm width — 3.346 × 7.087 × 2.362 in, with a 47.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 85 mm-bore 22317 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 60 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 85 mm bore (180×60 mm) is selected for shock and high radial load in screens and crushers; its 47.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22217 on the same journal.", "Check the shoulder geometry for 22317: a generous fillet on the 85 mm shaft looks strong but stops the 60 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 47.5 mm-section outer ring presses flush in the 180 mm housing.", "Large 22317 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 60 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22317 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 60 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 85 mm bore starved.", "Choose the bore type deliberately: plain 22317 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 85 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 22317 spherical roller bearing?", "a": "A 22317 double-row spherical roller bearing per ISO 15 has a 85 mm bore, 180 mm outer diameter and 60 mm width (3.346 × 7.087 × 2.362 in), a 47.5 mm radial section and roughly 6053 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22317 bore code work?", "a": "The leading 2 in 22317 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 17: 17 × 5 = 85 mm. The 180 mm OD and 60 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22317 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22317 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22317 and 22317K?", "a": "The plain 22317 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22317 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22317K", "22317-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22318", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7181, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22318 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 190 mm outside diameter and 64 mm width — 3.543 × 7.48 × 2.52 in, with a 50.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 90 mm-bore 22318 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 64 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 90 mm bore (190×64 mm) is selected for shock and high radial load in screens and crushers; its 50.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22218 on the same journal.", "The 64 mm-wide 22318 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 190 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 50.0 mm section.", "For a cylindrical-bore 22318, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 190 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22318: spalling concentrated on one side of the 190 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 90 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 64 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 22318 spherical roller bearing?", "a": "A 22318 double-row spherical roller bearing per ISO 15 has a 90 mm bore, 190 mm outer diameter and 64 mm width (3.543 × 7.48 × 2.52 in), a 50.0 mm radial section and roughly 7181 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22318 bore code work?", "a": "The leading 2 in 22318 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 18: 18 × 5 = 90 mm. The 190 mm OD and 64 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22318 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22318 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22318 and 22318K?", "a": "The plain 22318 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22318 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22318K", "22318-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22319", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 8317, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22319 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 200 mm outside diameter and 67 mm width — 3.74 × 7.874 × 2.638 in, with a 52.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "The large 95 mm-bore 22319 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 67 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 95 mm bore (200×67 mm) is selected for shock and high radial load in screens and crushers; its 52.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22219 on the same journal.", "Before fitting 22319, machine the 95 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 67 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 52.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22319 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 95 mm seat cannot creep.", "When reusing a sleeve-mounted 22319, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 95 mm journal must be replaced, or the new bearing frets the same seat.", "Specify W33 when the 67 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 22319 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 200 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 22319 spherical roller bearing?", "a": "A 22319 double-row spherical roller bearing per ISO 15 has a 95 mm bore, 200 mm outer diameter and 67 mm width (3.74 × 7.874 × 2.638 in), a 52.5 mm radial section and roughly 8317 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22319 bore code work?", "a": "The leading 2 in 22319 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 19: 19 × 5 = 95 mm. The 200 mm OD and 67 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22319 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22319 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22319 and 22319K?", "a": "The plain 22319 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22319 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22319K", "22319-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22320", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10598, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22320 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 215 mm outside diameter and 73 mm width — 3.937 × 8.465 × 2.874 in, with a 57.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 100 mm-bore 22320 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 73 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 100 mm bore (215×73 mm) is selected for shock and high radial load in screens and crushers; its 57.5 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22220 on the same journal.", "Check the shoulder geometry for 22320: a generous fillet on the 100 mm shaft looks strong but stops the 73 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 57.5 mm-section outer ring presses flush in the 215 mm housing.", "Large 22320 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 73 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22320 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 73 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 100 mm bore starved.", "Press 22320 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 215 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22320 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 22320 spherical roller bearing?", "a": "A 22320 double-row spherical roller bearing per ISO 15 has a 100 mm bore, 215 mm outer diameter and 73 mm width (3.937 × 8.465 × 2.874 in), a 57.5 mm radial section and roughly 10598 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22320 bore code work?", "a": "The leading 2 in 22320 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 20: 20 × 5 = 100 mm. The 215 mm OD and 73 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22320 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22320 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22320 and 22320K?", "a": "The plain 22320 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22320 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22320K", "22320-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22322", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 14587, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22322 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 15 envelope is 240 mm outside diameter and 80 mm width — 4.331 × 9.449 × 3.15 in, with a 65.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 110 mm-bore 22322 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 80 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 110 mm bore (240×80 mm) is selected for shock and high radial load in screens and crushers; its 65.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22222 on the same journal.", "Before fitting 22322, machine the 110 mm shaft seat and 240 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 80 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 65.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22322 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 110 mm seat cannot creep.", "When reusing a sleeve-mounted 22322, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 110 mm journal must be replaced, or the new bearing frets the same seat.", "In a classic two-bearing arrangement the 22322 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 22322 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 22322 spherical roller bearing?", "a": "A 22322 double-row spherical roller bearing per ISO 15 has a 110 mm bore, 240 mm outer diameter and 80 mm width (4.331 × 9.449 × 3.15 in), a 65.0 mm radial section and roughly 14587 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22322 bore code work?", "a": "The leading 2 in 22322 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 22: 22 × 5 = 110 mm. The 240 mm OD and 80 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22322 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22322 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22322 and 22322K?", "a": "The plain 22322 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22322 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22322K", "22322-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22324", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 18335, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22324 encode the bore: code 24 = 120 mm (code × 5 from 04 upward). The ISO 15 envelope is 260 mm outside diameter and 86 mm width — 4.724 × 10.236 × 3.386 in, with a 70.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 120 mm-bore 22324 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 86 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 120 mm bore (260×86 mm) is selected for shock and high radial load in screens and crushers; its 70.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22224 on the same journal.", "The 86 mm-wide 22324 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 120 mm bore and 260 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 70.0 mm section.", "For a cylindrical-bore 22324, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 120 mm shaft; cooling creates the interference, while hammering cold through the 260 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22324: spalling concentrated on one side of the 260 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 22324 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 22324 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 22324 spherical roller bearing?", "a": "A 22324 double-row spherical roller bearing per ISO 15 has a 120 mm bore, 260 mm outer diameter and 86 mm width (4.724 × 10.236 × 3.386 in), a 70.0 mm radial section and roughly 18335 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22324 bore code work?", "a": "The leading 2 in 22324 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 24: 24 × 5 = 120 mm. The 260 mm OD and 86 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22324 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22324 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22324 and 22324K?", "a": "The plain 22324 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22324 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22324K", "22324-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22326", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 22921, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22326 encode the bore: code 26 = 130 mm (code × 5 from 04 upward). The ISO 15 envelope is 280 mm outside diameter and 93 mm width — 5.118 × 11.024 × 3.661 in, with a 75.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 130 mm-bore 22326 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 93 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 130 mm bore (280×93 mm) is selected for shock and high radial load in screens and crushers; its 75.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22226 on the same journal.", "Check the shoulder geometry for 22326: a generous fillet on the 130 mm shaft looks strong but stops the 93 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 75.0 mm-section outer ring presses flush in the 280 mm housing.", "Large 22326 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 93 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Relubricate 22326 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 93 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 130 mm bore starved.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 130 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 93 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 22326 spherical roller bearing?", "a": "A 22326 double-row spherical roller bearing per ISO 15 has a 130 mm bore, 280 mm outer diameter and 93 mm width (5.118 × 11.024 × 3.661 in), a 75.0 mm radial section and roughly 22921 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22326 bore code work?", "a": "The leading 2 in 22326 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 26: 26 × 5 = 130 mm. The 280 mm OD and 93 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22326 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22326 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22326 and 22326K?", "a": "The plain 22326 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22326 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22326K", "22326-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22328", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 28777, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22328 encode the bore: code 28 = 140 mm (code × 5 from 04 upward). The ISO 15 envelope is 300 mm outside diameter and 102 mm width — 5.512 × 11.811 × 4.016 in, with a 80.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 140 mm-bore 22328 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 102 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 140 mm bore (300×102 mm) is selected for shock and high radial load in screens and crushers; its 80.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22228 on the same journal.", "Before fitting 22328, machine the 140 mm shaft seat and 300 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 102 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 80.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 22328 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 140 mm seat cannot creep.", "When reusing a sleeve-mounted 22328, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 140 mm journal must be replaced, or the new bearing frets the same seat.", "Press 22328 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 300 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 22328 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 22328 spherical roller bearing?", "a": "A 22328 double-row spherical roller bearing per ISO 15 has a 140 mm bore, 300 mm outer diameter and 102 mm width (5.512 × 11.811 × 4.016 in), a 80.0 mm radial section and roughly 28777 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22328 bore code work?", "a": "The leading 2 in 22328 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 28: 28 × 5 = 140 mm. The 300 mm OD and 102 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22328 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22328 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22328 and 22328K?", "a": "The plain 22328 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22328 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22328K", "22328-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "22330", "brand": "GENERIC-ISO", "series": "22300-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 34581, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 22300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 22330 encode the bore: code 30 = 150 mm (code × 5 from 04 upward). The ISO 15 envelope is 320 mm outside diameter and 108 mm width — 5.906 × 12.598 × 4.252 in, with a 85.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 150 mm-bore 22330 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 108 mm double-row assembly cannot be drifted into position without brinelling.", "The 223 heavy wide series at 150 mm bore (320×108 mm) is selected for shock and high radial load in screens and crushers; its 85.0 mm section needs correspondingly wider shaft and housing shoulders and a stiffer shaft than a 22230 on the same journal.", "The 108 mm-wide 22330 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 150 mm bore and 320 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 85.0 mm section.", "For a cylindrical-bore 22330, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 150 mm shaft; cooling creates the interference, while hammering cold through the 320 mm assembly dents the sphered raceways.", "Read the damage pattern on a removed 22330: spalling concentrated on one side of the 320 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "In a classic two-bearing arrangement the 22330 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 22330 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 22330 spherical roller bearing?", "a": "A 22330 double-row spherical roller bearing per ISO 15 has a 150 mm bore, 320 mm outer diameter and 108 mm width (5.906 × 12.598 × 4.252 in), a 85.0 mm radial section and roughly 34581 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 22330 bore code work?", "a": "The leading 2 in 22330 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 30: 30 × 5 = 150 mm. The 320 mm OD and 108 mm width come from the dimension series (22300), not from the bore code alone." }, { "q": "How much misalignment can a 22330 accommodate?", "a": "Thanks to the sphered outer ring raceway, 22330 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 22330 and 22330K?", "a": "The plain 22330 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 22330 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "22330K", "22330-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21310", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1039, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21310 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 27 mm width — 1.969 × 4.331 × 1.063 in, with a 30.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "On this 50 mm-bore 21310, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 50 mm shaft.", "The 213 series at 50 mm bore keeps the 27 mm width comparatively narrow for its 110 mm OD; it fits restricted axial space but carries less load than a 22310, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Before fitting 21310, machine the 50 mm shaft seat and 110 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 27 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21310 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 50 mm seat cannot creep.", "Relubricate 21310 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 27 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 50 mm bore starved.", "Specify W33 when the 27 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 21310 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 110 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 21310 spherical roller bearing?", "a": "A 21310 double-row spherical roller bearing per ISO 15 has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), a 30.0 mm radial section and roughly 1039 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21310 bore code work?", "a": "The leading 2 in 21310 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 10: 10 × 5 = 50 mm. The 110 mm OD and 27 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21310 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21310 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21310 and 21310K?", "a": "The plain 21310 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21310 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21310K", "21310-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21311", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1322, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21311 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 15 envelope is 120 mm outside diameter and 29 mm width — 2.165 × 4.724 × 1.142 in, with a 32.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "On this 55 mm-bore 21311, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 55 mm shaft.", "The 213 series at 55 mm bore keeps the 29 mm width comparatively narrow for its 120 mm OD; it fits restricted axial space but carries less load than a 22311, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Check the shoulder geometry for 21311: a generous fillet on the 55 mm shaft looks strong but stops the 29 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section outer ring presses flush in the 120 mm housing.", "Large 21311 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 29 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Read the damage pattern on a removed 21311: spalling concentrated on one side of the 120 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Press 21311 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 120 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 21311 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 21311 spherical roller bearing?", "a": "A 21311 double-row spherical roller bearing per ISO 15 has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), a 32.5 mm radial section and roughly 1322 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21311 bore code work?", "a": "The leading 2 in 21311 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 11: 11 × 5 = 55 mm. The 120 mm OD and 29 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21311 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21311 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21311 and 21311K?", "a": "The plain 21311 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21311 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21311K", "21311-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21312", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1652, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21312 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 31 mm width — 2.362 × 5.118 × 1.22 in, with a 35.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "On this 60 mm-bore 21312, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 60 mm shaft.", "The 213 series at 60 mm bore keeps the 31 mm width comparatively narrow for its 130 mm OD; it fits restricted axial space but carries less load than a 22312, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "The 31 mm-wide 21312 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 130 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "For a cylindrical-bore 21312, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 60 mm shaft; cooling creates the interference, while hammering cold through the 130 mm assembly dents the sphered raceways.", "When reusing a sleeve-mounted 21312, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 60 mm journal must be replaced, or the new bearing frets the same seat.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 21312 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 21312 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 21312 spherical roller bearing?", "a": "A 21312 double-row spherical roller bearing per ISO 15 has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), a 35.0 mm radial section and roughly 1652 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21312 bore code work?", "a": "The leading 2 in 21312 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 12: 12 × 5 = 60 mm. The 130 mm OD and 31 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21312 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21312 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21312 and 21312K?", "a": "The plain 21312 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21312 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21312K", "21312-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21313", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2033, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21313 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 33 mm width — 2.559 × 5.512 × 1.299 in, with a 37.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "On this 65 mm-bore 21313, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 65 mm shaft.", "The 213 series at 65 mm bore keeps the 33 mm width comparatively narrow for its 140 mm OD; it fits restricted axial space but carries less load than a 22313, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Before fitting 21313, machine the 65 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 33 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21313 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 65 mm seat cannot creep.", "Relubricate 21313 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 33 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 65 mm bore starved.", "In a classic two-bearing arrangement the 21313 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 21313 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 21313 spherical roller bearing?", "a": "A 21313 double-row spherical roller bearing per ISO 15 has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), a 37.5 mm radial section and roughly 2033 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21313 bore code work?", "a": "The leading 2 in 21313 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 13: 13 × 5 = 65 mm. The 140 mm OD and 33 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21313 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21313 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21313 and 21313K?", "a": "The plain 21313 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21313 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21313K", "21313-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21314", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2469, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21314 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 35 mm width — 2.756 × 5.906 × 1.378 in, with a 40.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "On this 70 mm-bore 21314, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 70 mm shaft.", "The 213 series at 70 mm bore keeps the 35 mm width comparatively narrow for its 150 mm OD; it fits restricted axial space but carries less load than a 22314, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Check the shoulder geometry for 21314: a generous fillet on the 70 mm shaft looks strong but stops the 35 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section outer ring presses flush in the 150 mm housing.", "Large 21314 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 35 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Read the damage pattern on a removed 21314: spalling concentrated on one side of the 150 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Self-aligning is not a licence to ignore alignment: 21314 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 21314 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 21314 spherical roller bearing?", "a": "A 21314 double-row spherical roller bearing per ISO 15 has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), a 40.0 mm radial section and roughly 2469 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21314 bore code work?", "a": "The leading 2 in 21314 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 14: 14 × 5 = 70 mm. The 150 mm OD and 35 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21314 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21314 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21314 and 21314K?", "a": "The plain 21314 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21314 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21314K", "21314-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21315", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 2962, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21315 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 160 mm outside diameter and 37 mm width — 2.953 × 6.299 × 1.457 in, with a 42.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "vibrating screens, feeders and shakeout machines", "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "On this 75 mm-bore 21315, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 75 mm shaft.", "The 213 series at 75 mm bore keeps the 37 mm width comparatively narrow for its 160 mm OD; it fits restricted axial space but carries less load than a 22315, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "The 37 mm-wide 21315 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 160 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 42.5 mm section.", "For a cylindrical-bore 21315, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 75 mm shaft; cooling creates the interference, while hammering cold through the 160 mm assembly dents the sphered raceways.", "When reusing a sleeve-mounted 21315, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 75 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 21315 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 21315 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 21315 spherical roller bearing?", "a": "A 21315 double-row spherical roller bearing per ISO 15 has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), a 42.5 mm radial section and roughly 2962 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21315 bore code work?", "a": "The leading 2 in 21315 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 15: 15 × 5 = 75 mm. The 160 mm OD and 37 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21315 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21315 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21315 and 21315K?", "a": "The plain 21315 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21315 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21315K", "21315-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21316", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3517, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21316 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 39 mm width — 3.15 × 6.693 × 1.535 in, with a 45.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit" ], "pitfalls": [ "The large 80 mm-bore 21316 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 39 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 80 mm bore keeps the 39 mm width comparatively narrow for its 170 mm OD; it fits restricted axial space but carries less load than a 22316, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Before fitting 21316, machine the 80 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 39 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21316 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.", "Relubricate 21316 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 39 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 80 mm bore starved.", "Choose the bore type deliberately: plain 21316 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 80 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 21316 spherical roller bearing?", "a": "A 21316 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), a 45.0 mm radial section and roughly 3517 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21316 bore code work?", "a": "The leading 2 in 21316 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 170 mm OD and 39 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21316 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21316 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21316 and 21316K?", "a": "The plain 21316 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21316 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21316K", "21316-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21317", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21317 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 41 mm width — 3.346 × 7.087 × 1.614 in, with a 47.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 85 mm-bore 21317 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 41 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 85 mm bore keeps the 41 mm width comparatively narrow for its 180 mm OD; it fits restricted axial space but carries less load than a 22317, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Check the shoulder geometry for 21317: a generous fillet on the 85 mm shaft looks strong but stops the 41 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 47.5 mm-section outer ring presses flush in the 180 mm housing.", "Large 21317 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 41 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Read the damage pattern on a removed 21317: spalling concentrated on one side of the 180 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 85 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 41 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 21317 spherical roller bearing?", "a": "A 21317 double-row spherical roller bearing per ISO 15 has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), a 47.5 mm radial section and roughly 4136 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21317 bore code work?", "a": "The leading 2 in 21317 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 17: 17 × 5 = 85 mm. The 180 mm OD and 41 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21317 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21317 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21317 and 21317K?", "a": "The plain 21317 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21317 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21317K", "21317-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21318", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4825, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21318 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 190 mm outside diameter and 43 mm width — 3.543 × 7.48 × 1.693 in, with a 50.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "The large 90 mm-bore 21318 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 43 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 90 mm bore keeps the 43 mm width comparatively narrow for its 190 mm OD; it fits restricted axial space but carries less load than a 22318, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "The 43 mm-wide 21318 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 190 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 50.0 mm section.", "For a cylindrical-bore 21318, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 190 mm assembly dents the sphered raceways.", "When reusing a sleeve-mounted 21318, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 90 mm journal must be replaced, or the new bearing frets the same seat.", "Specify W33 when the 43 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 21318 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 190 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 21318 spherical roller bearing?", "a": "A 21318 double-row spherical roller bearing per ISO 15 has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), a 50.0 mm radial section and roughly 4825 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21318 bore code work?", "a": "The leading 2 in 21318 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 18: 18 × 5 = 90 mm. The 190 mm OD and 43 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21318 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21318 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21318 and 21318K?", "a": "The plain 21318 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21318 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21318K", "21318-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21319", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5586, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21319 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 200 mm outside diameter and 45 mm width — 3.74 × 7.874 × 1.772 in, with a 52.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 95 mm-bore 21319 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 45 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 95 mm bore keeps the 45 mm width comparatively narrow for its 200 mm OD; it fits restricted axial space but carries less load than a 22319, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Before fitting 21319, machine the 95 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 45 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 52.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21319 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 95 mm seat cannot creep.", "Relubricate 21319 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 45 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 95 mm bore starved.", "Press 21319 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 200 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 21319 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 21319 spherical roller bearing?", "a": "A 21319 double-row spherical roller bearing per ISO 15 has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), a 52.5 mm radial section and roughly 5586 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21319 bore code work?", "a": "The leading 2 in 21319 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 19: 19 × 5 = 95 mm. The 200 mm OD and 45 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21319 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21319 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21319 and 21319K?", "a": "The plain 21319 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21319 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21319K", "21319-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21320", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6823, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21320 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 215 mm outside diameter and 47 mm width — 3.937 × 8.465 × 1.85 in, with a 57.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "The large 100 mm-bore 21320 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 47 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 100 mm bore keeps the 47 mm width comparatively narrow for its 215 mm OD; it fits restricted axial space but carries less load than a 22320, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Check the shoulder geometry for 21320: a generous fillet on the 100 mm shaft looks strong but stops the 47 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 57.5 mm-section outer ring presses flush in the 215 mm housing.", "Large 21320 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 47 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "Read the damage pattern on a removed 21320: spalling concentrated on one side of the 215 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 21320 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 21320 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 21320 spherical roller bearing?", "a": "A 21320 double-row spherical roller bearing per ISO 15 has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), a 57.5 mm radial section and roughly 6823 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21320 bore code work?", "a": "The leading 2 in 21320 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 20: 20 × 5 = 100 mm. The 215 mm OD and 47 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21320 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21320 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21320 and 21320K?", "a": "The plain 21320 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21320 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21320K", "21320-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "21322", "brand": "GENERIC-ISO", "series": "21300-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 9117, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21322 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 15 envelope is 240 mm outside diameter and 50 mm width — 4.331 × 9.449 × 1.969 in, with a 65.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 110 mm-bore 21322 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 50 mm double-row assembly cannot be drifted into position without brinelling.", "The 213 series at 110 mm bore keeps the 50 mm width comparatively narrow for its 240 mm OD; it fits restricted axial space but carries less load than a 22322, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.", "Before fitting 21322, machine the 110 mm shaft seat and 240 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 50 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 65.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21322 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 110 mm seat cannot creep.", "Relubricate 21322 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 50 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 110 mm bore starved.", "Self-aligning is not a licence to ignore alignment: 21322 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 21322 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant." ], "faq": [ { "q": "What are the dimensions of a 21322 spherical roller bearing?", "a": "A 21322 double-row spherical roller bearing per ISO 15 has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), a 65.0 mm radial section and roughly 9117 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 21322 bore code work?", "a": "The leading 2 in 21322 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 22: 22 × 5 = 110 mm. The 240 mm OD and 50 mm width come from the dimension series (21300), not from the bore code alone." }, { "q": "How much misalignment can a 21322 accommodate?", "a": "Thanks to the sphered outer ring raceway, 21322 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 21322 and 21322K?", "a": "The plain 21322 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 21322 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "21322K", "21322-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23014", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 779, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23014 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 15 envelope is 110 mm outside diameter and 27 mm width — 2.756 × 4.331 × 1.063 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine felt and press rolls", "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "On this 70 mm-bore 23014, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 70 mm shaft.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (110 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 20.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Thermal soak matters on this 70 mm-bore row: a 110 mm housing heating faster than the shaft closes the 20.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 27 mm assembly.", "Check the shoulder geometry for 23014: a generous fillet on the 70 mm shaft looks strong but stops the 27 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section outer ring presses flush in the 110 mm housing.", "Large 23014 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 27 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23014, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 70 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 23014 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 23014 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 23014 spherical roller bearing?", "a": "A 23014 double-row spherical roller bearing per ISO 15 has a 70 mm bore, 110 mm outer diameter and 27 mm width (2.756 × 4.331 × 1.063 in), a 20.0 mm radial section and roughly 779 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23014 bore code work?", "a": "The leading 2 in 23014 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 14: 14 × 5 = 70 mm. The 110 mm OD and 27 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23014 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23014 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23014 and 23014K?", "a": "The plain 23014 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23014 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23014K", "23014-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23015", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 914, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23015 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 15 envelope is 115 mm outside diameter and 30 mm width — 2.953 × 4.528 × 1.181 in, with a 20.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "industrial gearbox and drive shafts", "elevator winches and hoist drums", "process crane travel wheels", "conveyor head and tail pulleys", "vibrating screens, feeders and shakeout machines" ], "failure_modes": [ "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime" ], "pitfalls": [ "On this 75 mm-bore 23015, specify C3 clearance as the default for an interference inner-ring fit and verify residual play after mounting; a medium-section row that ran free on the bench can be fully clamped at operating temperature on the 75 mm shaft.", "The 230 series (ISO 15 dimension series 30) pairs a wide 30 mm section with a compact 115 mm OD at 75 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Housing stiffness governs the 23015: with the load carried on a 115 mm OD but only a 20.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 30 mm width.", "The 30 mm-wide 23015 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 115 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "For a cylindrical-bore 23015, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 75 mm shaft; cooling creates the interference, while hammering cold through the 115 mm assembly dents the sphered raceways.", "Relubricate 23015 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 30 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 75 mm bore starved.", "Choose the bore type deliberately: plain 23015 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 75 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class." ], "faq": [ { "q": "What are the dimensions of a 23015 spherical roller bearing?", "a": "A 23015 double-row spherical roller bearing per ISO 15 has a 75 mm bore, 115 mm outer diameter and 30 mm width (2.953 × 4.528 × 1.181 in), a 20.0 mm radial section and roughly 914 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23015 bore code work?", "a": "The leading 2 in 23015 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 15: 15 × 5 = 75 mm. The 115 mm OD and 30 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23015 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23015 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23015 and 23015K?", "a": "The plain 23015 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23015 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23015K", "23015-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23016", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1294, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23016 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 125 mm outside diameter and 35 mm width — 3.15 × 4.921 × 1.378 in, with a 22.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 80 mm-bore 23016 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 35 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 80 mm bore the 23016 gives a 125×35 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Drive-up a sleeve-mounted 23016 on residual clearance, not feel: the 80 mm K taper pulls the wide 35 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 22.5 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.", "Before fitting 23016, machine the 80 mm shaft seat and 125 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 35 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 22.5 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23016 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.", "Read the damage pattern on a removed 23016: spalling concentrated on one side of the 125 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 80 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 35 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23016 spherical roller bearing?", "a": "A 23016 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 125 mm outer diameter and 35 mm width (3.15 × 4.921 × 1.378 in), a 22.5 mm radial section and roughly 1294 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23016 bore code work?", "a": "The leading 2 in 23016 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 125 mm OD and 35 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23016 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23016 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23016 and 23016K?", "a": "The plain 23016 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23016 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23016K", "23016-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23017", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 36, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1396, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23017 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 15 envelope is 130 mm outside diameter and 36 mm width — 3.346 × 5.118 × 1.417 in, with a 22.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions" ], "failure_modes": [ "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely" ], "pitfalls": [ "The large 85 mm-bore 23017 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 36 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (130 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 22.5 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Grease life on the 23017 is set by the slow, dirty regime it usually works in: relubricate through the W33 groove until old grease flushes clear of the full 36 mm-wide double row, because the 22.5 mm section gives contamination little room to fall away from the 130 mm raceway on its own.", "Check the shoulder geometry for 23017: a generous fillet on the 85 mm shaft looks strong but stops the 36 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section outer ring presses flush in the 130 mm housing.", "Large 23017 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 36 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23017, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 85 mm journal must be replaced, or the new bearing frets the same seat.", "Specify W33 when the 36 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement.", "Press 23017 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 130 mm assembly." ], "faq": [ { "q": "What are the dimensions of a 23017 spherical roller bearing?", "a": "A 23017 double-row spherical roller bearing per ISO 15 has a 85 mm bore, 130 mm outer diameter and 36 mm width (3.346 × 5.118 × 1.417 in), a 22.5 mm radial section and roughly 1396 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23017 bore code work?", "a": "The leading 2 in 23017 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 17: 17 × 5 = 85 mm. The 130 mm OD and 36 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23017 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23017 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23017 and 23017K?", "a": "The plain 23017 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23017 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23017K", "23017-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23018", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1705, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23018 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 37 mm width — 3.543 × 5.512 × 1.457 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 90 mm-bore 23018 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 37 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 37 mm section with a compact 140 mm OD at 90 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Check shaft deflection across the 23018 span: the wide 37 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 90 mm seats — align to the catalogue angular limit under load, not at standstill.", "The 37 mm-wide 23018 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 140 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "For a cylindrical-bore 23018, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 140 mm assembly dents the sphered raceways.", "Relubricate 23018 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 37 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 90 mm bore starved.", "Press 23018 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 140 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23018 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 23018 spherical roller bearing?", "a": "A 23018 double-row spherical roller bearing per ISO 15 has a 90 mm bore, 140 mm outer diameter and 37 mm width (3.543 × 5.512 × 1.457 in), a 25.0 mm radial section and roughly 1705 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23018 bore code work?", "a": "The leading 2 in 23018 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 18: 18 × 5 = 90 mm. The 140 mm OD and 37 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23018 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23018 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23018 and 23018K?", "a": "The plain 23018 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23018 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23018K", "23018-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23019", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 35, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1683, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23019 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 15 envelope is 145 mm outside diameter and 35 mm width — 3.74 × 5.709 × 1.378 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery" ], "failure_modes": [ "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty" ], "pitfalls": [ "The large 95 mm-bore 23019 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 35 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 95 mm bore the 23019 gives a 145×35 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Thermal soak matters on this 95 mm-bore row: a 145 mm housing heating faster than the shaft closes the 25.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 35 mm assembly.", "Before fitting 23019, machine the 95 mm shaft seat and 145 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 35 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 25.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23019 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 95 mm seat cannot creep.", "Read the damage pattern on a removed 23019: spalling concentrated on one side of the 145 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23019 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.", "In a classic two-bearing arrangement the 23019 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row." ], "faq": [ { "q": "What are the dimensions of a 23019 spherical roller bearing?", "a": "A 23019 double-row spherical roller bearing per ISO 15 has a 95 mm bore, 145 mm outer diameter and 35 mm width (3.74 × 5.709 × 1.378 in), a 25.0 mm radial section and roughly 1683 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23019 bore code work?", "a": "The leading 2 in 23019 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 19: 19 × 5 = 95 mm. The 145 mm OD and 35 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23019 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23019 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23019 and 23019K?", "a": "The plain 23019 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23019 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23019K", "23019-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23020", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 1853, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23020 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 15 envelope is 150 mm outside diameter and 37 mm width — 3.937 × 5.906 × 1.457 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 100 mm-bore 23020 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 37 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (150 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 25.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Housing stiffness governs the 23020: with the load carried on a 150 mm OD but only a 25.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 37 mm width.", "Check the shoulder geometry for 23020: a generous fillet on the 100 mm shaft looks strong but stops the 37 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 25.0 mm-section outer ring presses flush in the 150 mm housing.", "Large 23020 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 37 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23020, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 100 mm journal must be replaced, or the new bearing frets the same seat.", "In a classic two-bearing arrangement the 23020 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23020 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23020 spherical roller bearing?", "a": "A 23020 double-row spherical roller bearing per ISO 15 has a 100 mm bore, 150 mm outer diameter and 37 mm width (3.937 × 5.906 × 1.457 in), a 25.0 mm radial section and roughly 1853 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23020 bore code work?", "a": "The leading 2 in 23020 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 20: 20 × 5 = 100 mm. The 150 mm OD and 37 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23020 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23020 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23020 and 23020K?", "a": "The plain 23020 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23020 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23020K", "23020-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23022", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3030, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23022 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 45 mm width — 4.331 × 6.693 × 1.772 in, with a 30.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 110 mm-bore 23022 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 45 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 110 mm bore the 23022 gives a 170×45 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Grease life on the 23022 is set by the slow, dirty regime it usually works in: relubricate through the W33 groove until old grease flushes clear of the full 45 mm-wide double row, because the 30.0 mm section gives contamination little room to fall away from the 170 mm raceway on its own.", "Before fitting 23022, machine the 110 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 45 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23022 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 110 mm seat cannot creep.", "Read the damage pattern on a removed 23022: spalling concentrated on one side of the 170 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 23022 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 23022 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 23022 spherical roller bearing?", "a": "A 23022 double-row spherical roller bearing per ISO 15 has a 110 mm bore, 170 mm outer diameter and 45 mm width (4.331 × 6.693 × 1.772 in), a 30.0 mm radial section and roughly 3030 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23022 bore code work?", "a": "The leading 2 in 23022 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 22: 22 × 5 = 110 mm. The 170 mm OD and 45 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23022 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23022 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23022 and 23022K?", "a": "The plain 23022 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23022 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23022K", "23022-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23024", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 3318, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23024 encode the bore: code 24 = 120 mm (code × 5 from 04 upward). The ISO 15 envelope is 180 mm outside diameter and 46 mm width — 4.724 × 7.087 × 1.811 in, with a 30.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 120 mm-bore 23024 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 46 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 46 mm section with a compact 180 mm OD at 120 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Thermal soak matters on this 120 mm-bore row: a 180 mm housing heating faster than the shaft closes the 30.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 46 mm assembly.", "The 46 mm-wide 23024 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 120 mm bore and 180 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 30.0 mm section.", "For a cylindrical-bore 23024, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 120 mm shaft; cooling creates the interference, while hammering cold through the 180 mm assembly dents the sphered raceways.", "Relubricate 23024 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 46 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 120 mm bore starved.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 120 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 46 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23024 spherical roller bearing?", "a": "A 23024 double-row spherical roller bearing per ISO 15 has a 120 mm bore, 180 mm outer diameter and 46 mm width (4.724 × 7.087 × 1.811 in), a 30.0 mm radial section and roughly 3318 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23024 bore code work?", "a": "The leading 2 in 23024 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 24: 24 × 5 = 120 mm. The 180 mm OD and 46 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23024 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23024 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23024 and 23024K?", "a": "The plain 23024 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23024 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23024K", "23024-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23026", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 4814, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23026 encode the bore: code 26 = 130 mm (code × 5 from 04 upward). The ISO 15 envelope is 200 mm outside diameter and 52 mm width — 5.118 × 7.874 × 2.047 in, with a 35.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 130 mm-bore 23026 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 52 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (200 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 35.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Drive-up a sleeve-mounted 23026 on residual clearance, not feel: the 130 mm K taper pulls the wide 52 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 35.0 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.", "Check the shoulder geometry for 23026: a generous fillet on the 130 mm shaft looks strong but stops the 52 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 35.0 mm-section outer ring presses flush in the 200 mm housing.", "Large 23026 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 52 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23026, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 130 mm journal must be replaced, or the new bearing frets the same seat.", "Press 23026 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 200 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23026 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 23026 spherical roller bearing?", "a": "A 23026 double-row spherical roller bearing per ISO 15 has a 130 mm bore, 200 mm outer diameter and 52 mm width (5.118 × 7.874 × 2.047 in), a 35.0 mm radial section and roughly 4814 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23026 bore code work?", "a": "The leading 2 in 23026 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 26: 26 × 5 = 130 mm. The 200 mm OD and 52 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23026 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23026 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23026 and 23026K?", "a": "The plain 23026 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23026 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23026K", "23026-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23028", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 5204, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23028 encode the bore: code 28 = 140 mm (code × 5 from 04 upward). The ISO 15 envelope is 210 mm outside diameter and 53 mm width — 5.512 × 8.268 × 2.087 in, with a 35.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 140 mm-bore 23028 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 53 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 140 mm bore the 23028 gives a 210×53 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Check shaft deflection across the 23028 span: the wide 53 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 140 mm seats — align to the catalogue angular limit under load, not at standstill.", "Before fitting 23028, machine the 140 mm shaft seat and 210 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 53 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 35.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23028 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 140 mm seat cannot creep.", "Read the damage pattern on a removed 23028: spalling concentrated on one side of the 210 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "In a classic two-bearing arrangement the 23028 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23028 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23028 spherical roller bearing?", "a": "A 23028 double-row spherical roller bearing per ISO 15 has a 140 mm bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in), a 35.0 mm radial section and roughly 5204 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23028 bore code work?", "a": "The leading 2 in 23028 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 28: 28 × 5 = 140 mm. The 210 mm OD and 53 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23028 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23028 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23028 and 23028K?", "a": "The plain 23028 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23028 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23028K", "23028-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23030", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 6312, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23030 encode the bore: code 30 = 150 mm (code × 5 from 04 upward). The ISO 15 envelope is 225 mm outside diameter and 56 mm width — 5.906 × 8.858 × 2.205 in, with a 37.5 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 150 mm-bore 23030 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 56 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 56 mm section with a compact 225 mm OD at 150 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Housing stiffness governs the 23030: with the load carried on a 225 mm OD but only a 37.5 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 56 mm width.", "The 56 mm-wide 23030 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 150 mm bore and 225 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 37.5 mm section.", "For a cylindrical-bore 23030, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 150 mm shaft; cooling creates the interference, while hammering cold through the 225 mm assembly dents the sphered raceways.", "Relubricate 23030 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 56 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 150 mm bore starved.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 23030 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 23030 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 23030 spherical roller bearing?", "a": "A 23030 double-row spherical roller bearing per ISO 15 has a 150 mm bore, 225 mm outer diameter and 56 mm width (5.906 × 8.858 × 2.205 in), a 37.5 mm radial section and roughly 6312 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23030 bore code work?", "a": "The leading 2 in 23030 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 30: 30 × 5 = 150 mm. The 225 mm OD and 56 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23030 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23030 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23030 and 23030K?", "a": "The plain 23030 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23030 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23030K", "23030-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23032", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 60, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 7694, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23032 encode the bore: code 32 = 160 mm (code × 5 from 04 upward). The ISO 15 envelope is 240 mm outside diameter and 60 mm width — 6.299 × 9.449 × 2.362 in, with a 40.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 160 mm-bore 23032 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 60 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (240 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 40.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Grease life on the 23032 is set by the slow, dirty regime it usually works in: relubricate through the W33 groove until old grease flushes clear of the full 60 mm-wide double row, because the 40.0 mm section gives contamination little room to fall away from the 240 mm raceway on its own.", "Check the shoulder geometry for 23032: a generous fillet on the 160 mm shaft looks strong but stops the 60 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section outer ring presses flush in the 240 mm housing.", "Large 23032 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 60 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23032, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 160 mm journal must be replaced, or the new bearing frets the same seat.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 160 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 60 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23032 spherical roller bearing?", "a": "A 23032 double-row spherical roller bearing per ISO 15 has a 160 mm bore, 240 mm outer diameter and 60 mm width (6.299 × 9.449 × 2.362 in), a 40.0 mm radial section and roughly 7694 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23032 bore code work?", "a": "The leading 2 in 23032 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 32: 32 × 5 = 160 mm. The 240 mm OD and 60 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23032 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23032 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23032 and 23032K?", "a": "The plain 23032 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23032 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23032K", "23032-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23034", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 67, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 10391, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23034 encode the bore: code 34 = 170 mm (code × 5 from 04 upward). The ISO 15 envelope is 260 mm outside diameter and 67 mm width — 6.693 × 10.236 × 2.638 in, with a 45.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing" ], "pitfalls": [ "The large 170 mm-bore 23034 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 67 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 170 mm bore the 23034 gives a 260×67 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Thermal soak matters on this 170 mm-bore row: a 260 mm housing heating faster than the shaft closes the 45.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 67 mm assembly.", "Before fitting 23034, machine the 170 mm shaft seat and 260 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 67 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23034 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 170 mm seat cannot creep.", "Read the damage pattern on a removed 23034: spalling concentrated on one side of the 260 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Press 23034 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 260 mm assembly.", "Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23034 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating." ], "faq": [ { "q": "What are the dimensions of a 23034 spherical roller bearing?", "a": "A 23034 double-row spherical roller bearing per ISO 15 has a 170 mm bore, 260 mm outer diameter and 67 mm width (6.693 × 10.236 × 2.638 in), a 45.0 mm radial section and roughly 10391 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23034 bore code work?", "a": "The leading 2 in 23034 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 34: 34 × 5 = 170 mm. The 260 mm OD and 67 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23034 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23034 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23034 and 23034K?", "a": "The plain 23034 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23034 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23034K", "23034-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23036", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 74, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 13642, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23036 encode the bore: code 36 = 180 mm (code × 5 from 04 upward). The ISO 15 envelope is 280 mm outside diameter and 74 mm width — 7.087 × 11.024 × 2.913 in, with a 50.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 180 mm-bore 23036 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 74 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 74 mm section with a compact 280 mm OD at 180 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Drive-up a sleeve-mounted 23036 on residual clearance, not feel: the 180 mm K taper pulls the wide 74 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 50.0 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.", "The 74 mm-wide 23036 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 180 mm bore and 280 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 50.0 mm section.", "For a cylindrical-bore 23036, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 180 mm shaft; cooling creates the interference, while hammering cold through the 280 mm assembly dents the sphered raceways.", "Relubricate 23036 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 74 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 180 mm bore starved.", "In a classic two-bearing arrangement the 23036 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23036 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23036 spherical roller bearing?", "a": "A 23036 double-row spherical roller bearing per ISO 15 has a 180 mm bore, 280 mm outer diameter and 74 mm width (7.087 × 11.024 × 2.913 in), a 50.0 mm radial section and roughly 13642 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23036 bore code work?", "a": "The leading 2 in 23036 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 36: 36 × 5 = 180 mm. The 280 mm OD and 74 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23036 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23036 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23036 and 23036K?", "a": "The plain 23036 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23036 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23036K", "23036-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23038", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 75, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 14427, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23038 encode the bore: code 38 = 190 mm (code × 5 from 04 upward). The ISO 15 envelope is 290 mm outside diameter and 75 mm width — 7.48 × 11.417 × 2.953 in, with a 50.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter" ], "pitfalls": [ "The large 190 mm-bore 23038 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 75 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (290 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 50.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Check shaft deflection across the 23038 span: the wide 75 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 190 mm seats — align to the catalogue angular limit under load, not at standstill.", "Check the shoulder geometry for 23038: a generous fillet on the 190 mm shaft looks strong but stops the 75 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 50.0 mm-section outer ring presses flush in the 290 mm housing.", "Large 23038 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 75 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23038, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 190 mm journal must be replaced, or the new bearing frets the same seat.", "Spherical rollers need a minimum radial load to keep the rollers driven — as a rule of thumb about 2% of the basic dynamic load rating; an unloaded 23038 on an idler or in a cold-start drive will skid and smear, so add preload, reduce the bearing size or use a sealed grease-filled variant.", "Choose the bore type deliberately: plain 23038 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable." ], "faq": [ { "q": "What are the dimensions of a 23038 spherical roller bearing?", "a": "A 23038 double-row spherical roller bearing per ISO 15 has a 190 mm bore, 290 mm outer diameter and 75 mm width (7.48 × 11.417 × 2.953 in), a 50.0 mm radial section and roughly 14427 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23038 bore code work?", "a": "The leading 2 in 23038 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 38: 38 × 5 = 190 mm. The 290 mm OD and 75 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23038 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23038 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23038 and 23038K?", "a": "The plain 23038 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23038 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23038K", "23038-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23040", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 82, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 18435, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23040 encode the bore: code 40 = 200 mm (code × 5 from 04 upward). The ISO 15 envelope is 310 mm outside diameter and 82 mm width — 7.874 × 12.205 × 3.228 in, with a 55.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 200 mm-bore 23040 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 82 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 200 mm bore the 23040 gives a 310×82 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Housing stiffness governs the 23040: with the load carried on a 310 mm OD but only a 55.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 82 mm width.", "Before fitting 23040, machine the 200 mm shaft seat and 310 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 82 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 55.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23040 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 200 mm seat cannot creep.", "Read the damage pattern on a removed 23040: spalling concentrated on one side of the 310 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 200 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 82 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23040 spherical roller bearing?", "a": "A 23040 double-row spherical roller bearing per ISO 15 has a 200 mm bore, 310 mm outer diameter and 82 mm width (7.874 × 12.205 × 3.228 in), a 55.0 mm radial section and roughly 18435 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23040 bore code work?", "a": "The leading 2 in 23040 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 40: 40 × 5 = 200 mm. The 310 mm OD and 82 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23040 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23040 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23040 and 23040K?", "a": "The plain 23040 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23040 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23040K", "23040-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23044", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 90, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 24237, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23044 encode the bore: code 44 = 220 mm (code × 5 from 04 upward). The ISO 15 envelope is 340 mm outside diameter and 90 mm width — 8.661 × 13.386 × 3.543 in, with a 60.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 220 mm-bore 23044 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 90 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (340 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 60.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Thermal soak matters on this 220 mm-bore row: a 340 mm housing heating faster than the shaft closes the 60.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 90 mm assembly.", "Check the shoulder geometry for 23044: a generous fillet on the 220 mm shaft looks strong but stops the 90 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 60.0 mm-section outer ring presses flush in the 340 mm housing.", "Large 23044 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 90 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23044, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 220 mm journal must be replaced, or the new bearing frets the same seat.", "In a classic two-bearing arrangement the 23044 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23044 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23044 spherical roller bearing?", "a": "A 23044 double-row spherical roller bearing per ISO 15 has a 220 mm bore, 340 mm outer diameter and 90 mm width (8.661 × 13.386 × 3.543 in), a 60.0 mm radial section and roughly 24237 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23044 bore code work?", "a": "The leading 2 in 23044 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 44: 44 × 5 = 220 mm. The 340 mm OD and 90 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23044 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23044 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23044 and 23044K?", "a": "The plain 23044 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23044 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23044K", "23044-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23048", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 92, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 26546, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23048 encode the bore: code 48 = 240 mm (code × 5 from 04 upward). The ISO 15 envelope is 360 mm outside diameter and 92 mm width — 9.449 × 14.173 × 3.622 in, with a 60.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 240 mm-bore 23048 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 92 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 92 mm section with a compact 360 mm OD at 240 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Check shaft deflection across the 23048 span: the wide 92 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 240 mm seats — align to the catalogue angular limit under load, not at standstill.", "The 92 mm-wide 23048 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 240 mm bore and 360 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 60.0 mm section.", "For a cylindrical-bore 23048, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 240 mm shaft; cooling creates the interference, while hammering cold through the 360 mm assembly dents the sphered raceways.", "Relubricate 23048 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 92 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 240 mm bore starved.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 240 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 92 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23048 spherical roller bearing?", "a": "A 23048 double-row spherical roller bearing per ISO 15 has a 240 mm bore, 360 mm outer diameter and 92 mm width (9.449 × 14.173 × 3.622 in), a 60.0 mm radial section and roughly 26546 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23048 bore code work?", "a": "The leading 2 in 23048 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 48: 48 × 5 = 240 mm. The 360 mm OD and 92 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23048 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23048 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23048 and 23048K?", "a": "The plain 23048 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23048 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23048K", "23048-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23052", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 104, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 38510, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23052 encode the bore: code 52 = 260 mm (code × 5 from 04 upward). The ISO 15 envelope is 400 mm outside diameter and 104 mm width — 10.236 × 15.748 × 4.094 in, with a 70.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 260 mm-bore 23052 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 104 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 260 mm bore the 23052 gives a 400×104 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Grease life on the 23052 is set by the slow, dirty regime it usually works in: relubricate through the W33 groove until old grease flushes clear of the full 104 mm-wide double row, because the 70.0 mm section gives contamination little room to fall away from the 400 mm raceway on its own.", "Before fitting 23052, machine the 260 mm shaft seat and 400 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 104 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 70.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23052 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 260 mm seat cannot creep.", "Read the damage pattern on a removed 23052: spalling concentrated on one side of the 400 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "In a classic two-bearing arrangement the 23052 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23052 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23052 spherical roller bearing?", "a": "A 23052 double-row spherical roller bearing per ISO 15 has a 260 mm bore, 400 mm outer diameter and 104 mm width (10.236 × 15.748 × 4.094 in), a 70.0 mm radial section and roughly 38510 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23052 bore code work?", "a": "The leading 2 in 23052 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 52: 52 × 5 = 260 mm. The 400 mm OD and 104 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23052 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23052 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23052 and 23052K?", "a": "The plain 23052 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23052 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23052K", "23052-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23056", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 106, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 41630, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23056 encode the bore: code 56 = 280 mm (code × 5 from 04 upward). The ISO 15 envelope is 420 mm outside diameter and 106 mm width — 11.024 × 16.535 × 4.173 in, with a 70.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 280 mm-bore 23056 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 106 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series keeps the outside diameter one step below the 222 medium row at the same bore (420 mm against roughly a size larger), which raises shaft support without growing the housing — the flip side is that its 70.0 mm section concentrates load, so seat finish, shoulder squareness and housing stiffness matter more than on a wider 223 row.", "Drive-up a sleeve-mounted 23056 on residual clearance, not feel: the 280 mm K taper pulls the wide 106 mm inner ring up quickly, and every 0.01 mm of radial clearance removed is real preload on a 70.0 mm section — measure with feeler gauges at the unloaded roller row before locking the KM nut.", "Check the shoulder geometry for 23056: a generous fillet on the 280 mm shaft looks strong but stops the 106 mm inner ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 70.0 mm-section outer ring presses flush in the 420 mm housing.", "Large 23056 tapers should be mounted with a hydraulic nut or oil injection: controlled drive-up sets the residual radial clearance on the 106 mm-wide double row, whereas bar-and-spanner force either under-drives (fretting) or over-drives (thermal seizure on first hot run).", "When reusing a sleeve-mounted 23056, inspect the adapter and lock parts together with the bearing: a stretched sleeve or a bent lockwasher tab that let the inner ring creep on the 280 mm journal must be replaced, or the new bearing frets the same seat.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 280 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 106 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23056 spherical roller bearing?", "a": "A 23056 double-row spherical roller bearing per ISO 15 has a 280 mm bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in), a 70.0 mm radial section and roughly 41630 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23056 bore code work?", "a": "The leading 2 in 23056 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 56: 56 × 5 = 280 mm. The 420 mm OD and 106 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23056 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23056 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23056 and 23056K?", "a": "The plain 23056 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23056 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23056K", "23056-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23060", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 118, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 57503, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23060 encode the bore: code 60 = 300 mm (code × 5 from 04 upward). The ISO 15 envelope is 460 mm outside diameter and 118 mm width — 11.811 × 18.11 × 4.646 in, with a 80.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders", "large gear drives and mill pinions", "heavy conveyor drum pulleys" ], "failure_modes": [ "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade", "unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely", "thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing", "raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty", "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set" ], "pitfalls": [ "The large 300 mm-bore 23060 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 118 mm double-row assembly cannot be drifted into position without brinelling.", "The 230 series (ISO 15 dimension series 30) pairs a wide 118 mm section with a compact 460 mm OD at 300 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.", "Housing stiffness governs the 23060: with the load carried on a 460 mm OD but only a 80.0 mm radial section feeding it, a soft or ribbed thin housing lets the outer ring flex and the sphered raceway misreads it as misalignment — support the housing boss fully around the 118 mm width.", "The 118 mm-wide 23060 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 300 mm bore and 460 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 80.0 mm section.", "For a cylindrical-bore 23060, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 300 mm shaft; cooling creates the interference, while hammering cold through the 460 mm assembly dents the sphered raceways.", "Relubricate 23060 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 118 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 300 mm bore starved.", "In a classic two-bearing arrangement the 23060 often serves as the non-locating (floating) bearing, taking radial load while the housing bore lets it drift; it can locate axially in both directions, but sustained pure thrust beyond the catalogue limit unloads one roller row.", "Self-aligning is not a licence to ignore alignment: 23060 accommodates typically around 1° of angular misalignment under normal load (roughly 2° only in favourable, light-load conditions) — the exact figure falls with load, so check the catalogue value rather than designing to the maximum." ], "faq": [ { "q": "What are the dimensions of a 23060 spherical roller bearing?", "a": "A 23060 double-row spherical roller bearing per ISO 15 has a 300 mm bore, 460 mm outer diameter and 118 mm width (11.811 × 18.11 × 4.646 in), a 80.0 mm radial section and roughly 57503 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23060 bore code work?", "a": "The leading 2 in 23060 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 60: 60 × 5 = 300 mm. The 460 mm OD and 118 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23060 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23060 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23060 and 23060K?", "a": "The plain 23060 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23060 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23060K", "23060-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "23064", "brand": "GENERIC-ISO", "series": "23000-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 121, "seal_type": "open", "clearance": "CN", "clearance_options": [ "CN", "C3", "C4" ], "tolerance_class": "P0", "cage_type": "steel", "weight_g": 62068, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23064 encode the bore: code 64 = 320 mm (code × 5 from 04 upward). The ISO 15 envelope is 480 mm outside diameter and 121 mm width — 12.598 × 18.898 × 4.764 in, with a 80.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a m6 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.", "applications": [ "heavy conveyor drum pulleys", "cement and aggregate processing machinery", "mining and aggregate vibrating screens", "jaw and cone crusher eccentric shafts", "paper machine drying cylinders" ], "failure_modes": [ "roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set", "cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit", "fretting corrosion on a tapered-bore sleeve seat when drive-up is insufficient and the inner ring works on the adapter", "lubricant starvation and cage wear where the relubrication interval ignores the slow-speed, dirty operating regime", "water and grit pitting of open bearings in mining and pulping duty after the housing seals degrade" ], "pitfalls": [ "The large 320 mm-bore 23064 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 121 mm double-row assembly cannot be drifted into position without brinelling.", "In vibrating-screen and feeder duty the 230 row is a common pick: at 320 mm bore the 23064 gives a 480×121 mm envelope with a wide, stiff section, but it must then run C4 clearance with a vibratory-rated cage — a standard CN row with a plain stamped cage will gall and fail early under the same duty.", "Thermal soak matters on this 320 mm-bore row: a 480 mm housing heating faster than the shaft closes the 80.0 mm section's internal clearance, so a mount that ran quiet cold can seize hot — start from C3/C4 and verify the operating-temperature play before signing off the 121 mm assembly.", "Before fitting 23064, machine the 320 mm shaft seat and 480 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 121 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 80.0 mm radial section.", "On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 23064 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 320 mm seat cannot creep.", "Read the damage pattern on a removed 23064: spalling concentrated on one side of the 480 mm outer race points to misalignment or thrust overload, while uniform roller-end smearing means minimum-load skidding — the two failures demand opposite corrections.", "Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 320 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.", "Specify W33 when the 121 mm-wide bearing must be relubricated in place: it is the outer-ring annular groove with lubrication holes; without W33 grease only reaches the contacts through the shaft or housing arrangement." ], "faq": [ { "q": "What are the dimensions of a 23064 spherical roller bearing?", "a": "A 23064 double-row spherical roller bearing per ISO 15 has a 320 mm bore, 480 mm outer diameter and 121 mm width (12.598 × 18.898 × 4.764 in), a 80.0 mm radial section and roughly 62068 g geometry-based estimated mass; catalogue masses vary with cage and design." }, { "q": "How does the 23064 bore code work?", "a": "The leading 2 in 23064 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 64: 64 × 5 = 320 mm. The 480 mm OD and 121 mm width come from the dimension series (23000), not from the bore code alone." }, { "q": "How much misalignment can a 23064 accommodate?", "a": "Thanks to the sphered outer ring raceway, 23064 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty." }, { "q": "What is the difference between 23064 and 23064K?", "a": "The plain 23064 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer." }, { "q": "Should the 23064 be ordered with CN, C3 or C4 clearance?", "a": "Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option." } ], "cross_ref": [], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-srb-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [ "23064K", "23064-K" ], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120 }, { "sku": "30204", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 47, "B_mm": 15.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 111, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30204 encode the bore: code 04 = 20 mm (code × 5 from 04 upward). The ISO 355 envelope is 47 mm outside diameter and 15.25 mm total assembly width T over the separable cone and cup — 0.787 × 1.85 × 0.6 in, with a 13.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "At 20 mm bore the small 30204 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 20 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 302 light series at 20 mm bore (47×15.25 mm, 13.5 mm section) is the default general-purpose tapered row; a 32204 on the same 20 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30204, machine the 20 mm shaft seat and 47 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 15.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 13.5 mm radial section.", "The 30204 cup drives into the 47 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 15.25 mm load zone.", "Inspect the removed 30204 cone and cup as a pair: pitting on the 47 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 20 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Tapered rollers accept virtually no misalignment; a deflected 20 mm shaft or a tilted housing shoulder concentrates load on one end of the 15.25 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 30204 cone onto the 20 mm shaft with force on the inner ring and the cup into the 47 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 30204 tapered roller bearing?", "a": "A 30204 single-row metric tapered roller bearing per ISO 355 has a 20 mm bore, 47 mm outer diameter and 15.25 mm total assembly width (0.787 × 1.85 × 0.6 in), a 13.5 mm radial section and roughly 111 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30204 bore code work?", "a": "The last two digits of 30204 are bore code 04, giving 04 × 5 = 20 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 47 mm OD and 15.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30204?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30204 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30204 set?", "a": "At fit-up the 20 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 20 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30204 take axial load in both directions?", "a": "A single 30204 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30205", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 52, "B_mm": 16.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 135, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30205 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 355 envelope is 52 mm outside diameter and 16.25 mm total assembly width T over the separable cone and cup — 0.984 × 2.047 × 0.64 in, with a 13.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "At 25 mm bore the small 30205 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 25 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 302 light series at 25 mm bore (52×16.25 mm, 13.5 mm section) is the default general-purpose tapered row; a 32205 on the same 25 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30205: a generous fillet on the 25 mm shaft looks strong but stops the 16.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 13.5 mm-section cup presses flush in the 52 mm housing.", "Never fit 30205 by tightening the adjuster to force the cone up the 25 mm taper — draw the nut to seat the rollers, then back it off; the 16.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30205 pair matched through rebuilds; the 16.25 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 25 mm shaft alignment.", "Press the 30205 cone onto the 25 mm shaft with force on the inner ring and the cup into the 52 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 30205 tapered roller bearing?", "a": "A 30205 single-row metric tapered roller bearing per ISO 355 has a 25 mm bore, 52 mm outer diameter and 16.25 mm total assembly width (0.984 × 2.047 × 0.64 in), a 13.5 mm radial section and roughly 135 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30205 bore code work?", "a": "The last two digits of 30205 are bore code 05, giving 05 × 5 = 25 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 52 mm OD and 16.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30205?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30205 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30205 set?", "a": "At fit-up the 25 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 25 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30205 take axial load in both directions?", "a": "A single 30205 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30206", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 62, "B_mm": 17.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 204, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30206 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 355 envelope is 62 mm outside diameter and 17.25 mm total assembly width T over the separable cone and cup — 1.181 × 2.441 × 0.679 in, with a 16.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "At 30 mm bore the small 30206 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 30 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 302 light series at 30 mm bore (62×17.25 mm, 16.0 mm section) is the default general-purpose tapered row; a 32206 on the same 30 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 17.25 mm-wide 30206 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 62 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 16.0 mm section.", "When mounting 30206 to a 30 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 62 mm assembly dents the tapered raceway before first run.", "Relubrication for 30206 must reach the rib-roller end contact, not just the 30 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 17.25 mm-wide assembly or the sliding rib contact starves first.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 30206 tapered roller bearing?", "a": "A 30206 single-row metric tapered roller bearing per ISO 355 has a 30 mm bore, 62 mm outer diameter and 17.25 mm total assembly width (1.181 × 2.441 × 0.679 in), a 16.0 mm radial section and roughly 204 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30206 bore code work?", "a": "The last two digits of 30206 are bore code 06, giving 06 × 5 = 30 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 62 mm OD and 17.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30206?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30206 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30206 set?", "a": "At fit-up the 30 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 30 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30206 take axial load in both directions?", "a": "A single 30206 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30207", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 72, "B_mm": 18.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 290, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30207 encode the bore: code 07 = 35 mm (code × 5 from 04 upward). The ISO 355 envelope is 72 mm outside diameter and 18.25 mm total assembly width T over the separable cone and cup — 1.378 × 2.835 × 0.719 in, with a 18.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts", "agricultural implement wheels" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "At 35 mm bore the small 30207 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 35 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 302 light series at 35 mm bore (72×18.25 mm, 18.5 mm section) is the default general-purpose tapered row; a 32207 on the same 35 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30207, machine the 35 mm shaft seat and 72 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 18.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 18.5 mm radial section.", "The 30207 cup drives into the 72 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 18.25 mm load zone.", "Inspect the removed 30207 cone and cup as a pair: pitting on the 72 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 35 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 30207 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 302-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 30207 tapered roller bearing?", "a": "A 30207 single-row metric tapered roller bearing per ISO 355 has a 35 mm bore, 72 mm outer diameter and 18.25 mm total assembly width (1.378 × 2.835 × 0.719 in), a 18.5 mm radial section and roughly 290 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30207 bore code work?", "a": "The last two digits of 30207 are bore code 07, giving 07 × 5 = 35 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 72 mm OD and 18.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30207?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30207 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30207 set?", "a": "At fit-up the 35 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 35 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30207 take axial load in both directions?", "a": "A single 30207 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30208", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 80, "B_mm": 19.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 380, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30208 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 355 envelope is 80 mm outside diameter and 19.75 mm total assembly width T over the separable cone and cup — 1.575 × 3.15 × 0.778 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "On this 40 mm-bore 30208, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 40 mm seat can seize hot.", "The 302 light series at 40 mm bore (80×19.75 mm, 20.0 mm section) is the default general-purpose tapered row; a 32208 on the same 40 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30208: a generous fillet on the 40 mm shaft looks strong but stops the 19.75 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section cup presses flush in the 80 mm housing.", "Never fit 30208 by tightening the adjuster to force the cone up the 40 mm taper — draw the nut to seat the rollers, then back it off; the 19.75 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30208 pair matched through rebuilds; the 19.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 40 mm shaft alignment.", "A single 30208 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 302-series pair adjusted against each other.", "The cone and the cup of 30208 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 30208 tapered roller bearing?", "a": "A 30208 single-row metric tapered roller bearing per ISO 355 has a 40 mm bore, 80 mm outer diameter and 19.75 mm total assembly width (1.575 × 3.15 × 0.778 in), a 20.0 mm radial section and roughly 380 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30208 bore code work?", "a": "The last two digits of 30208 are bore code 08, giving 08 × 5 = 40 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 80 mm OD and 19.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30208?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30208 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30208 set?", "a": "At fit-up the 40 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 40 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30208 take axial load in both directions?", "a": "A single 30208 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30209", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 85, "B_mm": 20.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 432, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30209 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 355 envelope is 85 mm outside diameter and 20.75 mm total assembly width T over the separable cone and cup — 1.772 × 3.346 × 0.817 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "On this 45 mm-bore 30209, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 45 mm seat can seize hot.", "The 302 light series at 45 mm bore (85×20.75 mm, 20.0 mm section) is the default general-purpose tapered row; a 32209 on the same 45 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 20.75 mm-wide 30209 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 85 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "When mounting 30209 to a 45 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 85 mm assembly dents the tapered raceway before first run.", "Relubrication for 30209 must reach the rib-roller end contact, not just the 45 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 20.75 mm-wide assembly or the sliding rib contact starves first.", "The cone and the cup of 30209 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 45 mm-bore 30209 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 30209 tapered roller bearing?", "a": "A 30209 single-row metric tapered roller bearing per ISO 355 has a 45 mm bore, 85 mm outer diameter and 20.75 mm total assembly width (1.772 × 3.346 × 0.817 in), a 20.0 mm radial section and roughly 432 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30209 bore code work?", "a": "The last two digits of 30209 are bore code 09, giving 09 × 5 = 45 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 85 mm OD and 20.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30209?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30209 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30209 set?", "a": "At fit-up the 45 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 45 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30209 take axial load in both directions?", "a": "A single 30209 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30210", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 90, "B_mm": 21.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 488, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30210 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 355 envelope is 90 mm outside diameter and 21.75 mm total assembly width T over the separable cone and cup — 1.969 × 3.543 × 0.856 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "On this 50 mm-bore 30210, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 50 mm seat can seize hot.", "The 302 light series at 50 mm bore (90×21.75 mm, 20.0 mm section) is the default general-purpose tapered row; a 32210 on the same 50 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30210, machine the 50 mm shaft seat and 90 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 21.75 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 20.0 mm radial section.", "The 30210 cup drives into the 90 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 21.75 mm load zone.", "Inspect the removed 30210 cone and cup as a pair: pitting on the 90 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 50 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 50 mm-bore 30210 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 30210 tapered roller bearing?", "a": "A 30210 single-row metric tapered roller bearing per ISO 355 has a 50 mm bore, 90 mm outer diameter and 21.75 mm total assembly width (1.969 × 3.543 × 0.856 in), a 20.0 mm radial section and roughly 488 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30210 bore code work?", "a": "The last two digits of 30210 are bore code 10, giving 10 × 5 = 50 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 90 mm OD and 21.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30210?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30210 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30210 set?", "a": "At fit-up the 50 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 50 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30210 take axial load in both directions?", "a": "A single 30210 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30211", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 100, "B_mm": 22.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 636, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30211 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 355 envelope is 100 mm outside diameter and 22.75 mm total assembly width T over the separable cone and cup — 2.165 × 3.937 × 0.896 in, with a 22.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "On this 55 mm-bore 30211, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 55 mm seat can seize hot.", "The 302 light series at 55 mm bore (100×22.75 mm, 22.5 mm section) is the default general-purpose tapered row; a 32211 on the same 55 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30211: a generous fillet on the 55 mm shaft looks strong but stops the 22.75 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section cup presses flush in the 100 mm housing.", "Never fit 30211 by tightening the adjuster to force the cone up the 55 mm taper — draw the nut to seat the rollers, then back it off; the 22.75 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30211 pair matched through rebuilds; the 22.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 55 mm shaft alignment.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 55 mm shaft or a tilted housing shoulder concentrates load on one end of the 22.75 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 30211 tapered roller bearing?", "a": "A 30211 single-row metric tapered roller bearing per ISO 355 has a 55 mm bore, 100 mm outer diameter and 22.75 mm total assembly width (2.165 × 3.937 × 0.896 in), a 22.5 mm radial section and roughly 636 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30211 bore code work?", "a": "The last two digits of 30211 are bore code 11, giving 11 × 5 = 55 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 100 mm OD and 22.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30211?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30211 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30211 set?", "a": "At fit-up the 55 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 55 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30211 take axial load in both directions?", "a": "A single 30211 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30212", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 110, "B_mm": 23.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 809, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30212 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 355 envelope is 110 mm outside diameter and 23.75 mm total assembly width T over the separable cone and cup — 2.362 × 4.331 × 0.935 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "On this 60 mm-bore 30212, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 60 mm seat can seize hot.", "The 302 light series at 60 mm bore (110×23.75 mm, 25.0 mm section) is the default general-purpose tapered row; a 32212 on the same 60 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 23.75 mm-wide 30212 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 110 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "When mounting 30212 to a 60 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 110 mm assembly dents the tapered raceway before first run.", "Relubrication for 30212 must reach the rib-roller end contact, not just the 60 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 23.75 mm-wide assembly or the sliding rib contact starves first.", "Tapered rollers accept virtually no misalignment; a deflected 60 mm shaft or a tilted housing shoulder concentrates load on one end of the 23.75 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 30212 cone onto the 60 mm shaft with force on the inner ring and the cup into the 110 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 30212 tapered roller bearing?", "a": "A 30212 single-row metric tapered roller bearing per ISO 355 has a 60 mm bore, 110 mm outer diameter and 23.75 mm total assembly width (2.362 × 4.331 × 0.935 in), a 25.0 mm radial section and roughly 809 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30212 bore code work?", "a": "The last two digits of 30212 are bore code 12, giving 12 × 5 = 60 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 110 mm OD and 23.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30212?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30212 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30212 set?", "a": "At fit-up the 60 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 60 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30212 take axial load in both directions?", "a": "A single 30212 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30213", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 120, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1009, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30213 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 355 envelope is 120 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 2.559 × 4.724 × 0.974 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "On this 65 mm-bore 30213, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 65 mm seat can seize hot.", "The 302 light series at 65 mm bore (120×24.75 mm, 27.5 mm section) is the default general-purpose tapered row; a 32213 on the same 65 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30213, machine the 65 mm shaft seat and 120 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 24.75 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 27.5 mm radial section.", "The 30213 cup drives into the 120 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 24.75 mm load zone.", "Inspect the removed 30213 cone and cup as a pair: pitting on the 120 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 65 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Press the 30213 cone onto the 65 mm shaft with force on the inner ring and the cup into the 120 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 30213 tapered roller bearing?", "a": "A 30213 single-row metric tapered roller bearing per ISO 355 has a 65 mm bore, 120 mm outer diameter and 24.75 mm total assembly width (2.559 × 4.724 × 0.974 in), a 27.5 mm radial section and roughly 1009 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30213 bore code work?", "a": "The last two digits of 30213 are bore code 13, giving 13 × 5 = 65 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 120 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30213?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30213 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30213 set?", "a": "At fit-up the 65 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 65 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30213 take axial load in both directions?", "a": "A single 30213 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30214", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1064, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30214 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 355 envelope is 125 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 2.756 × 4.921 × 0.974 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "On this 70 mm-bore 30214, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 70 mm seat can seize hot.", "The 302 light series at 70 mm bore (125×24.75 mm, 27.5 mm section) is the default general-purpose tapered row; a 32214 on the same 70 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30214: a generous fillet on the 70 mm shaft looks strong but stops the 24.75 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 27.5 mm-section cup presses flush in the 125 mm housing.", "Never fit 30214 by tightening the adjuster to force the cone up the 70 mm taper — draw the nut to seat the rollers, then back it off; the 24.75 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30214 pair matched through rebuilds; the 24.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 70 mm shaft alignment.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 30214 tapered roller bearing?", "a": "A 30214 single-row metric tapered roller bearing per ISO 355 has a 70 mm bore, 125 mm outer diameter and 24.75 mm total assembly width (2.756 × 4.921 × 0.974 in), a 27.5 mm radial section and roughly 1064 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30214 bore code work?", "a": "The last two digits of 30214 are bore code 14, giving 14 × 5 = 70 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 125 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30214?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30214 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30214 set?", "a": "At fit-up the 70 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 70 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30214 take axial load in both directions?", "a": "A single 30214 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30215", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 130, "B_mm": 27.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1231, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30215 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 355 envelope is 130 mm outside diameter and 27.25 mm total assembly width T over the separable cone and cup — 2.953 × 5.118 × 1.073 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "On this 75 mm-bore 30215, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 75 mm seat can seize hot.", "The 302 light series at 75 mm bore (130×27.25 mm, 27.5 mm section) is the default general-purpose tapered row; a 32215 on the same 75 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 27.25 mm-wide 30215 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 130 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "When mounting 30215 to a 75 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 130 mm assembly dents the tapered raceway before first run.", "Relubrication for 30215 must reach the rib-roller end contact, not just the 75 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 27.25 mm-wide assembly or the sliding rib contact starves first.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 30215 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 302-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 30215 tapered roller bearing?", "a": "A 30215 single-row metric tapered roller bearing per ISO 355 has a 75 mm bore, 130 mm outer diameter and 27.25 mm total assembly width (2.953 × 5.118 × 1.073 in), a 27.5 mm radial section and roughly 1231 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30215 bore code work?", "a": "The last two digits of 30215 are bore code 15, giving 15 × 5 = 75 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 130 mm OD and 27.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30215?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30215 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30215 set?", "a": "At fit-up the 75 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 75 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30215 take axial load in both directions?", "a": "A single 30215 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30216", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 140, "B_mm": 28.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1494, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30216 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 355 envelope is 140 mm outside diameter and 28.25 mm total assembly width T over the separable cone and cup — 3.15 × 5.512 × 1.112 in, with a 30.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "The large 80 mm-bore 30216 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 80 mm shaft.", "The 302 light series at 80 mm bore (140×28.25 mm, 30.0 mm section) is the default general-purpose tapered row; a 32216 on the same 80 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30216, machine the 80 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 28.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "The 30216 cup drives into the 140 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 28.25 mm load zone.", "Inspect the removed 30216 cone and cup as a pair: pitting on the 140 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 80 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "A single 30216 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 302-series pair adjusted against each other.", "The cone and the cup of 30216 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 30216 tapered roller bearing?", "a": "A 30216 single-row metric tapered roller bearing per ISO 355 has a 80 mm bore, 140 mm outer diameter and 28.25 mm total assembly width (3.15 × 5.512 × 1.112 in), a 30.0 mm radial section and roughly 1494 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30216 bore code work?", "a": "The last two digits of 30216 are bore code 16, giving 16 × 5 = 80 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 140 mm OD and 28.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30216?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30216 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30216 set?", "a": "At fit-up the 80 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 80 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30216 take axial load in both directions?", "a": "A single 30216 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30217", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 150, "B_mm": 30.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1867, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30217 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 355 envelope is 150 mm outside diameter and 30.5 mm total assembly width T over the separable cone and cup — 3.346 × 5.906 × 1.201 in, with a 32.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "The large 85 mm-bore 30217 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 85 mm shaft.", "The 302 light series at 85 mm bore (150×30.5 mm, 32.5 mm section) is the default general-purpose tapered row; a 32217 on the same 85 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30217: a generous fillet on the 85 mm shaft looks strong but stops the 30.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section cup presses flush in the 150 mm housing.", "Never fit 30217 by tightening the adjuster to force the cone up the 85 mm taper — draw the nut to seat the rollers, then back it off; the 30.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30217 pair matched through rebuilds; the 30.5 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 85 mm shaft alignment.", "The cone and the cup of 30217 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 85 mm-bore 30217 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 30217 tapered roller bearing?", "a": "A 30217 single-row metric tapered roller bearing per ISO 355 has a 85 mm bore, 150 mm outer diameter and 30.5 mm total assembly width (3.346 × 5.906 × 1.201 in), a 32.5 mm radial section and roughly 1867 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30217 bore code work?", "a": "The last two digits of 30217 are bore code 17, giving 17 × 5 = 85 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 150 mm OD and 30.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30217?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30217 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30217 set?", "a": "At fit-up the 85 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 85 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30217 take axial load in both directions?", "a": "A single 30217 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30218", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 160, "B_mm": 32.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2279, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30218 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 355 envelope is 160 mm outside diameter and 32.5 mm total assembly width T over the separable cone and cup — 3.543 × 6.299 × 1.28 in, with a 35.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "The large 90 mm-bore 30218 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 90 mm shaft.", "The 302 light series at 90 mm bore (160×32.5 mm, 35.0 mm section) is the default general-purpose tapered row; a 32218 on the same 90 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 32.5 mm-wide 30218 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 160 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "When mounting 30218 to a 90 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 160 mm assembly dents the tapered raceway before first run.", "Relubrication for 30218 must reach the rib-roller end contact, not just the 90 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 32.5 mm-wide assembly or the sliding rib contact starves first.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 90 mm-bore 30218 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 30218 tapered roller bearing?", "a": "A 30218 single-row metric tapered roller bearing per ISO 355 has a 90 mm bore, 160 mm outer diameter and 32.5 mm total assembly width (3.543 × 6.299 × 1.28 in), a 35.0 mm radial section and roughly 2279 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30218 bore code work?", "a": "The last two digits of 30218 are bore code 18, giving 18 × 5 = 90 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 160 mm OD and 32.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30218?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30218 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30218 set?", "a": "At fit-up the 90 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 90 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30218 take axial load in both directions?", "a": "A single 30218 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30219", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 170, "B_mm": 34.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2748, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30219 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 355 envelope is 170 mm outside diameter and 34.5 mm total assembly width T over the separable cone and cup — 3.74 × 6.693 × 1.358 in, with a 37.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "The large 95 mm-bore 30219 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 95 mm shaft.", "The 302 light series at 95 mm bore (170×34.5 mm, 37.5 mm section) is the default general-purpose tapered row; a 32219 on the same 95 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30219, machine the 95 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 34.5 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "The 30219 cup drives into the 170 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 34.5 mm load zone.", "Inspect the removed 30219 cone and cup as a pair: pitting on the 170 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 95 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 95 mm shaft or a tilted housing shoulder concentrates load on one end of the 34.5 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 30219 tapered roller bearing?", "a": "A 30219 single-row metric tapered roller bearing per ISO 355 has a 95 mm bore, 170 mm outer diameter and 34.5 mm total assembly width (3.74 × 6.693 × 1.358 in), a 37.5 mm radial section and roughly 2748 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30219 bore code work?", "a": "The last two digits of 30219 are bore code 19, giving 19 × 5 = 95 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 170 mm OD and 34.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30219?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30219 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30219 set?", "a": "At fit-up the 95 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 95 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30219 take axial load in both directions?", "a": "A single 30219 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30220", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 180, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3321, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30220 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 37 mm total assembly width T over the separable cone and cup — 3.937 × 7.087 × 1.457 in, with a 40.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "The large 100 mm-bore 30220 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 100 mm shaft.", "The 302 light series at 100 mm bore (180×37 mm, 40.0 mm section) is the default general-purpose tapered row; a 32220 on the same 100 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Check the shoulder geometry for 30220: a generous fillet on the 100 mm shaft looks strong but stops the 37 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section cup presses flush in the 180 mm housing.", "Never fit 30220 by tightening the adjuster to force the cone up the 100 mm taper — draw the nut to seat the rollers, then back it off; the 37 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 30220 pair matched through rebuilds; the 37 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 100 mm shaft alignment.", "Tapered rollers accept virtually no misalignment; a deflected 100 mm shaft or a tilted housing shoulder concentrates load on one end of the 37 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 30220 cone onto the 100 mm shaft with force on the inner ring and the cup into the 180 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 30220 tapered roller bearing?", "a": "A 30220 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 180 mm outer diameter and 37 mm total assembly width (3.937 × 7.087 × 1.457 in), a 40.0 mm radial section and roughly 3321 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30220 bore code work?", "a": "The last two digits of 30220 are bore code 20, giving 20 × 5 = 100 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 180 mm OD and 37 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30220?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30220 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30220 set?", "a": "At fit-up the 100 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 100 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30220 take axial load in both directions?", "a": "A single 30220 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30221", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 190, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3919, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30221 encode the bore: code 21 = 105 mm (code × 5 from 04 upward). The ISO 355 envelope is 190 mm outside diameter and 39 mm total assembly width T over the separable cone and cup — 4.134 × 7.48 × 1.535 in, with a 42.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "The large 105 mm-bore 30221 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 105 mm shaft.", "The 302 light series at 105 mm bore (190×39 mm, 42.5 mm section) is the default general-purpose tapered row; a 32221 on the same 105 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "The 39 mm-wide 30221 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 105 mm bore and 190 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 42.5 mm section.", "When mounting 30221 to a 105 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 190 mm assembly dents the tapered raceway before first run.", "Relubrication for 30221 must reach the rib-roller end contact, not just the 105 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 39 mm-wide assembly or the sliding rib contact starves first.", "Press the 30221 cone onto the 105 mm shaft with force on the inner ring and the cup into the 190 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 30221 tapered roller bearing?", "a": "A 30221 single-row metric tapered roller bearing per ISO 355 has a 105 mm bore, 190 mm outer diameter and 39 mm total assembly width (4.134 × 7.48 × 1.535 in), a 42.5 mm radial section and roughly 3919 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30221 bore code work?", "a": "The last two digits of 30221 are bore code 21, giving 21 × 5 = 105 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 190 mm OD and 39 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30221?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30221 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30221 set?", "a": "At fit-up the 105 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 105 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30221 take axial load in both directions?", "a": "A single 30221 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30221", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "30222", "brand": "GENERIC-ISO", "series": "30200-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 200, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4584, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 30200-series the last two digits of 30222 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 355 envelope is 200 mm outside diameter and 41 mm total assembly width T over the separable cone and cup — 4.331 × 7.874 × 1.614 in, with a 45.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "The large 110 mm-bore 30222 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 110 mm shaft.", "The 302 light series at 110 mm bore (200×41 mm, 45.0 mm section) is the default general-purpose tapered row; a 32222 on the same 110 mm bore uses the same OD but a wider section for heavier load — it is not a like-for-like width swap.", "Before fitting 30222, machine the 110 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 41 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "The 30222 cup drives into the 200 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 41 mm load zone.", "Inspect the removed 30222 cone and cup as a pair: pitting on the 200 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 110 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Do not swap a 30200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 30222 tapered roller bearing?", "a": "A 30222 single-row metric tapered roller bearing per ISO 355 has a 110 mm bore, 200 mm outer diameter and 41 mm total assembly width (4.331 × 7.874 × 1.614 in), a 45.0 mm radial section and roughly 4584 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 30222 bore code work?", "a": "The last two digits of 30222 are bore code 22, giving 22 × 5 = 110 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 200 mm OD and 41 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 30222?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 30222 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 30222 set?", "a": "At fit-up the 110 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 110 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 30222 take axial load in both directions?", "a": "A single 30222 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "30222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32204", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 47, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 138, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32204 encode the bore: code 04 = 20 mm (code × 5 from 04 upward). The ISO 355 envelope is 47 mm outside diameter and 19 mm total assembly width T over the separable cone and cup — 0.787 × 1.85 × 0.748 in, with a 13.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light differential pinions", "steering knuckles", "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "At 20 mm bore the small 32204 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 20 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 322 medium series at 20 mm bore (47×19 mm) gains roller length and load over the 30204 on the same OD; the wider 19 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32204, machine the 20 mm shaft seat and 47 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 19 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 13.5 mm radial section.", "The 32204 cup drives into the 47 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 19 mm load zone.", "Relubrication for 32204 must reach the rib-roller end contact, not just the 20 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 19 mm-wide assembly or the sliding rib contact starves first.", "Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32204 tapered roller bearing?", "a": "A 32204 single-row metric tapered roller bearing per ISO 355 has a 20 mm bore, 47 mm outer diameter and 19 mm total assembly width (0.787 × 1.85 × 0.748 in), a 13.5 mm radial section and roughly 138 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32204 bore code work?", "a": "The last two digits of 32204 are bore code 04, giving 04 × 5 = 20 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 47 mm OD and 19 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32204?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32204 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32204 set?", "a": "At fit-up the 20 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 20 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32204 take axial load in both directions?", "a": "A single 32204 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32205", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 52, "B_mm": 19.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 160, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32205 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 355 envelope is 52 mm outside diameter and 19.25 mm total assembly width T over the separable cone and cup — 0.984 × 2.047 × 0.758 in, with a 13.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "steering knuckles", "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "At 25 mm bore the small 32205 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 25 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 322 medium series at 25 mm bore (52×19.25 mm) gains roller length and load over the 30205 on the same OD; the wider 19.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32205: a generous fillet on the 25 mm shaft looks strong but stops the 19.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 13.5 mm-section cup presses flush in the 52 mm housing.", "Never fit 32205 by tightening the adjuster to force the cone up the 25 mm taper — draw the nut to seat the rollers, then back it off; the 19.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32205 cone and cup as a pair: pitting on the 52 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 25 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32205 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32205 tapered roller bearing?", "a": "A 32205 single-row metric tapered roller bearing per ISO 355 has a 25 mm bore, 52 mm outer diameter and 19.25 mm total assembly width (0.984 × 2.047 × 0.758 in), a 13.5 mm radial section and roughly 160 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32205 bore code work?", "a": "The last two digits of 32205 are bore code 05, giving 05 × 5 = 25 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 52 mm OD and 19.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32205?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32205 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32205 set?", "a": "At fit-up the 25 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 25 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32205 take axial load in both directions?", "a": "A single 32205 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32206", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 62, "B_mm": 21.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 251, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32206 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 355 envelope is 62 mm outside diameter and 21.25 mm total assembly width T over the separable cone and cup — 1.181 × 2.441 × 0.837 in, with a 16.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "At 30 mm bore the small 32206 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 30 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 322 medium series at 30 mm bore (62×21.25 mm) gains roller length and load over the 30206 on the same OD; the wider 21.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 21.25 mm-wide 32206 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 62 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 16.0 mm section.", "When mounting 32206 to a 30 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 62 mm assembly dents the tapered raceway before first run.", "Keep the 32206 pair matched through rebuilds; the 21.25 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 30 mm shaft alignment.", "A single 32206 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other.", "The cone and the cup of 32206 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32206 tapered roller bearing?", "a": "A 32206 single-row metric tapered roller bearing per ISO 355 has a 30 mm bore, 62 mm outer diameter and 21.25 mm total assembly width (1.181 × 2.441 × 0.837 in), a 16.0 mm radial section and roughly 251 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32206 bore code work?", "a": "The last two digits of 32206 are bore code 06, giving 06 × 5 = 30 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 62 mm OD and 21.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32206?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32206 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32206 set?", "a": "At fit-up the 30 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 30 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32206 take axial load in both directions?", "a": "A single 32206 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32207", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 72, "B_mm": 24.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 385, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32207 encode the bore: code 07 = 35 mm (code × 5 from 04 upward). The ISO 355 envelope is 72 mm outside diameter and 24.25 mm total assembly width T over the separable cone and cup — 1.378 × 2.835 × 0.955 in, with a 18.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "At 35 mm bore the small 32207 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 35 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 322 medium series at 35 mm bore (72×24.25 mm) gains roller length and load over the 30207 on the same OD; the wider 24.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32207, machine the 35 mm shaft seat and 72 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 24.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 18.5 mm radial section.", "The 32207 cup drives into the 72 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 24.25 mm load zone.", "Relubrication for 32207 must reach the rib-roller end contact, not just the 35 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 24.25 mm-wide assembly or the sliding rib contact starves first.", "The cone and the cup of 32207 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 35 mm-bore 32207 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32207 tapered roller bearing?", "a": "A 32207 single-row metric tapered roller bearing per ISO 355 has a 35 mm bore, 72 mm outer diameter and 24.25 mm total assembly width (1.378 × 2.835 × 0.955 in), a 18.5 mm radial section and roughly 385 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32207 bore code work?", "a": "The last two digits of 32207 are bore code 07, giving 07 × 5 = 35 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 72 mm OD and 24.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32207?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32207 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32207 set?", "a": "At fit-up the 35 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 35 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32207 take axial load in both directions?", "a": "A single 32207 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32208", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 80, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 476, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32208 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 355 envelope is 80 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 1.575 × 3.15 × 0.974 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "On this 40 mm-bore 32208, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 40 mm seat can seize hot.", "The 322 medium series at 40 mm bore (80×24.75 mm) gains roller length and load over the 30208 on the same OD; the wider 24.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32208: a generous fillet on the 40 mm shaft looks strong but stops the 24.75 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section cup presses flush in the 80 mm housing.", "Never fit 32208 by tightening the adjuster to force the cone up the 40 mm taper — draw the nut to seat the rollers, then back it off; the 24.75 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32208 cone and cup as a pair: pitting on the 80 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 40 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 40 mm-bore 32208 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32208 tapered roller bearing?", "a": "A 32208 single-row metric tapered roller bearing per ISO 355 has a 40 mm bore, 80 mm outer diameter and 24.75 mm total assembly width (1.575 × 3.15 × 0.974 in), a 20.0 mm radial section and roughly 476 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32208 bore code work?", "a": "The last two digits of 32208 are bore code 08, giving 08 × 5 = 40 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 80 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32208?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32208 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32208 set?", "a": "At fit-up the 40 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 40 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32208 take axial load in both directions?", "a": "A single 32208 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32209", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 85, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 516, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32209 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 355 envelope is 85 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 1.772 × 3.346 × 0.974 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "On this 45 mm-bore 32209, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 45 mm seat can seize hot.", "The 322 medium series at 45 mm bore (85×24.75 mm) gains roller length and load over the 30209 on the same OD; the wider 24.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 24.75 mm-wide 32209 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 85 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "When mounting 32209 to a 45 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 85 mm assembly dents the tapered raceway before first run.", "Keep the 32209 pair matched through rebuilds; the 24.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 45 mm shaft alignment.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 45 mm shaft or a tilted housing shoulder concentrates load on one end of the 24.75 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32209 tapered roller bearing?", "a": "A 32209 single-row metric tapered roller bearing per ISO 355 has a 45 mm bore, 85 mm outer diameter and 24.75 mm total assembly width (1.772 × 3.346 × 0.974 in), a 20.0 mm radial section and roughly 516 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32209 bore code work?", "a": "The last two digits of 32209 are bore code 09, giving 09 × 5 = 45 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 85 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32209?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32209 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32209 set?", "a": "At fit-up the 45 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 45 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32209 take axial load in both directions?", "a": "A single 32209 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32210", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 90, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 555, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32210 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 355 envelope is 90 mm outside diameter and 24.75 mm total assembly width T over the separable cone and cup — 1.969 × 3.543 × 0.974 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "On this 50 mm-bore 32210, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 50 mm seat can seize hot.", "The 322 medium series at 50 mm bore (90×24.75 mm) gains roller length and load over the 30210 on the same OD; the wider 24.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32210, machine the 50 mm shaft seat and 90 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 24.75 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 20.0 mm radial section.", "The 32210 cup drives into the 90 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 24.75 mm load zone.", "Relubrication for 32210 must reach the rib-roller end contact, not just the 50 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 24.75 mm-wide assembly or the sliding rib contact starves first.", "Tapered rollers accept virtually no misalignment; a deflected 50 mm shaft or a tilted housing shoulder concentrates load on one end of the 24.75 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32210 cone onto the 50 mm shaft with force on the inner ring and the cup into the 90 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32210 tapered roller bearing?", "a": "A 32210 single-row metric tapered roller bearing per ISO 355 has a 50 mm bore, 90 mm outer diameter and 24.75 mm total assembly width (1.969 × 3.543 × 0.974 in), a 20.0 mm radial section and roughly 555 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32210 bore code work?", "a": "The last two digits of 32210 are bore code 10, giving 10 × 5 = 50 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 90 mm OD and 24.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32210?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32210 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32210 set?", "a": "At fit-up the 50 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 50 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32210 take axial load in both directions?", "a": "A single 32210 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32211", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 100, "B_mm": 26.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 748, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32211 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 355 envelope is 100 mm outside diameter and 26.75 mm total assembly width T over the separable cone and cup — 2.165 × 3.937 × 1.053 in, with a 22.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "On this 55 mm-bore 32211, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 55 mm seat can seize hot.", "The 322 medium series at 55 mm bore (100×26.75 mm) gains roller length and load over the 30211 on the same OD; the wider 26.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32211: a generous fillet on the 55 mm shaft looks strong but stops the 26.75 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section cup presses flush in the 100 mm housing.", "Never fit 32211 by tightening the adjuster to force the cone up the 55 mm taper — draw the nut to seat the rollers, then back it off; the 26.75 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32211 cone and cup as a pair: pitting on the 100 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 55 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Press the 32211 cone onto the 55 mm shaft with force on the inner ring and the cup into the 100 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32211 tapered roller bearing?", "a": "A 32211 single-row metric tapered roller bearing per ISO 355 has a 55 mm bore, 100 mm outer diameter and 26.75 mm total assembly width (2.165 × 3.937 × 1.053 in), a 22.5 mm radial section and roughly 748 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32211 bore code work?", "a": "The last two digits of 32211 are bore code 11, giving 11 × 5 = 55 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 100 mm OD and 26.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32211?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32211 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32211 set?", "a": "At fit-up the 55 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 55 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32211 take axial load in both directions?", "a": "A single 32211 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32212", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 110, "B_mm": 29.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1013, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32212 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 355 envelope is 110 mm outside diameter and 29.75 mm total assembly width T over the separable cone and cup — 2.362 × 4.331 × 1.171 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "On this 60 mm-bore 32212, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 60 mm seat can seize hot.", "The 322 medium series at 60 mm bore (110×29.75 mm) gains roller length and load over the 30212 on the same OD; the wider 29.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 29.75 mm-wide 32212 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 110 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "When mounting 32212 to a 60 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 110 mm assembly dents the tapered raceway before first run.", "Keep the 32212 pair matched through rebuilds; the 29.75 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 60 mm shaft alignment.", "Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32212 tapered roller bearing?", "a": "A 32212 single-row metric tapered roller bearing per ISO 355 has a 60 mm bore, 110 mm outer diameter and 29.75 mm total assembly width (2.362 × 4.331 × 1.171 in), a 25.0 mm radial section and roughly 1013 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32212 bore code work?", "a": "The last two digits of 32212 are bore code 12, giving 12 × 5 = 60 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 110 mm OD and 29.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32212?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32212 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32212 set?", "a": "At fit-up the 60 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 60 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32212 take axial load in both directions?", "a": "A single 32212 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32213", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 120, "B_mm": 32.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1335, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32213 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 355 envelope is 120 mm outside diameter and 32.75 mm total assembly width T over the separable cone and cup — 2.559 × 4.724 × 1.289 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "On this 65 mm-bore 32213, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 65 mm seat can seize hot.", "The 322 medium series at 65 mm bore (120×32.75 mm) gains roller length and load over the 30213 on the same OD; the wider 32.75 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32213, machine the 65 mm shaft seat and 120 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 32.75 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 27.5 mm radial section.", "The 32213 cup drives into the 120 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 32.75 mm load zone.", "Relubrication for 32213 must reach the rib-roller end contact, not just the 65 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 32.75 mm-wide assembly or the sliding rib contact starves first.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32213 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32213 tapered roller bearing?", "a": "A 32213 single-row metric tapered roller bearing per ISO 355 has a 65 mm bore, 120 mm outer diameter and 32.75 mm total assembly width (2.559 × 4.724 × 1.289 in), a 27.5 mm radial section and roughly 1335 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32213 bore code work?", "a": "The last two digits of 32213 are bore code 13, giving 13 × 5 = 65 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 120 mm OD and 32.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32213?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32213 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32213 set?", "a": "At fit-up the 65 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 65 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32213 take axial load in both directions?", "a": "A single 32213 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32214", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 125, "B_mm": 33.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1429, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32214 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 355 envelope is 125 mm outside diameter and 33.25 mm total assembly width T over the separable cone and cup — 2.756 × 4.921 × 1.309 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "On this 70 mm-bore 32214, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 70 mm seat can seize hot.", "The 322 medium series at 70 mm bore (125×33.25 mm) gains roller length and load over the 30214 on the same OD; the wider 33.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32214: a generous fillet on the 70 mm shaft looks strong but stops the 33.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 27.5 mm-section cup presses flush in the 125 mm housing.", "Never fit 32214 by tightening the adjuster to force the cone up the 70 mm taper — draw the nut to seat the rollers, then back it off; the 33.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32214 cone and cup as a pair: pitting on the 125 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 70 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "A single 32214 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other.", "The cone and the cup of 32214 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32214 tapered roller bearing?", "a": "A 32214 single-row metric tapered roller bearing per ISO 355 has a 70 mm bore, 125 mm outer diameter and 33.25 mm total assembly width (2.756 × 4.921 × 1.309 in), a 27.5 mm radial section and roughly 1429 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32214 bore code work?", "a": "The last two digits of 32214 are bore code 14, giving 14 × 5 = 70 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 125 mm OD and 33.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32214?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32214 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32214 set?", "a": "At fit-up the 70 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 70 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32214 take axial load in both directions?", "a": "A single 32214 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32215", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 130, "B_mm": 33.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1502, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32215 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 355 envelope is 130 mm outside diameter and 33.25 mm total assembly width T over the separable cone and cup — 2.953 × 5.118 × 1.309 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "On this 75 mm-bore 32215, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 75 mm seat can seize hot.", "The 322 medium series at 75 mm bore (130×33.25 mm) gains roller length and load over the 30215 on the same OD; the wider 33.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 33.25 mm-wide 32215 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 130 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "When mounting 32215 to a 75 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 130 mm assembly dents the tapered raceway before first run.", "Keep the 32215 pair matched through rebuilds; the 33.25 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 75 mm shaft alignment.", "The cone and the cup of 32215 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 75 mm-bore 32215 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32215 tapered roller bearing?", "a": "A 32215 single-row metric tapered roller bearing per ISO 355 has a 75 mm bore, 130 mm outer diameter and 33.25 mm total assembly width (2.953 × 5.118 × 1.309 in), a 27.5 mm radial section and roughly 1502 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32215 bore code work?", "a": "The last two digits of 32215 are bore code 15, giving 15 × 5 = 75 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 130 mm OD and 33.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32215?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32215 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32215 set?", "a": "At fit-up the 75 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 75 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32215 take axial load in both directions?", "a": "A single 32215 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32216", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 140, "B_mm": 35.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1865, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32216 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 355 envelope is 140 mm outside diameter and 35.25 mm total assembly width T over the separable cone and cup — 3.15 × 5.512 × 1.388 in, with a 30.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "The large 80 mm-bore 32216 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 80 mm shaft.", "The 322 medium series at 80 mm bore (140×35.25 mm) gains roller length and load over the 30216 on the same OD; the wider 35.25 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32216, machine the 80 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 35.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "The 32216 cup drives into the 140 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 35.25 mm load zone.", "Relubrication for 32216 must reach the rib-roller end contact, not just the 80 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 35.25 mm-wide assembly or the sliding rib contact starves first.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 80 mm-bore 32216 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32216 tapered roller bearing?", "a": "A 32216 single-row metric tapered roller bearing per ISO 355 has a 80 mm bore, 140 mm outer diameter and 35.25 mm total assembly width (3.15 × 5.512 × 1.388 in), a 30.0 mm radial section and roughly 1865 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32216 bore code work?", "a": "The last two digits of 32216 are bore code 16, giving 16 × 5 = 80 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 140 mm OD and 35.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32216?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32216 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32216 set?", "a": "At fit-up the 80 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 80 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32216 take axial load in both directions?", "a": "A single 32216 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32217", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 150, "B_mm": 38.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2357, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32217 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 355 envelope is 150 mm outside diameter and 38.5 mm total assembly width T over the separable cone and cup — 3.346 × 5.906 × 1.516 in, with a 32.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "The large 85 mm-bore 32217 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 85 mm shaft.", "The 322 medium series at 85 mm bore (150×38.5 mm) gains roller length and load over the 30217 on the same OD; the wider 38.5 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32217: a generous fillet on the 85 mm shaft looks strong but stops the 38.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section cup presses flush in the 150 mm housing.", "Never fit 32217 by tightening the adjuster to force the cone up the 85 mm taper — draw the nut to seat the rollers, then back it off; the 38.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32217 cone and cup as a pair: pitting on the 150 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 85 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 85 mm shaft or a tilted housing shoulder concentrates load on one end of the 38.5 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32217 tapered roller bearing?", "a": "A 32217 single-row metric tapered roller bearing per ISO 355 has a 85 mm bore, 150 mm outer diameter and 38.5 mm total assembly width (3.346 × 5.906 × 1.516 in), a 32.5 mm radial section and roughly 2357 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32217 bore code work?", "a": "The last two digits of 32217 are bore code 17, giving 17 × 5 = 85 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 150 mm OD and 38.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32217?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32217 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32217 set?", "a": "At fit-up the 85 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 85 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32217 take axial load in both directions?", "a": "A single 32217 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32218", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 160, "B_mm": 42.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2981, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32218 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 355 envelope is 160 mm outside diameter and 42.5 mm total assembly width T over the separable cone and cup — 3.543 × 6.299 × 1.673 in, with a 35.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "The large 90 mm-bore 32218 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 90 mm shaft.", "The 322 medium series at 90 mm bore (160×42.5 mm) gains roller length and load over the 30218 on the same OD; the wider 42.5 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 42.5 mm-wide 32218 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 160 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "When mounting 32218 to a 90 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 160 mm assembly dents the tapered raceway before first run.", "Keep the 32218 pair matched through rebuilds; the 42.5 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 90 mm shaft alignment.", "Tapered rollers accept virtually no misalignment; a deflected 90 mm shaft or a tilted housing shoulder concentrates load on one end of the 42.5 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32218 cone onto the 90 mm shaft with force on the inner ring and the cup into the 160 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32218 tapered roller bearing?", "a": "A 32218 single-row metric tapered roller bearing per ISO 355 has a 90 mm bore, 160 mm outer diameter and 42.5 mm total assembly width (3.543 × 6.299 × 1.673 in), a 35.0 mm radial section and roughly 2981 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32218 bore code work?", "a": "The last two digits of 32218 are bore code 18, giving 18 × 5 = 90 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 160 mm OD and 42.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32218?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32218 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32218 set?", "a": "At fit-up the 90 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 90 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32218 take axial load in both directions?", "a": "A single 32218 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32219", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 170, "B_mm": 45.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3624, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32219 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 355 envelope is 170 mm outside diameter and 45.5 mm total assembly width T over the separable cone and cup — 3.74 × 6.693 × 1.791 in, with a 37.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "The large 95 mm-bore 32219 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 95 mm shaft.", "The 322 medium series at 95 mm bore (170×45.5 mm) gains roller length and load over the 30219 on the same OD; the wider 45.5 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32219, machine the 95 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 45.5 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "The 32219 cup drives into the 170 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 45.5 mm load zone.", "Relubrication for 32219 must reach the rib-roller end contact, not just the 95 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 45.5 mm-wide assembly or the sliding rib contact starves first.", "Press the 32219 cone onto the 95 mm shaft with force on the inner ring and the cup into the 170 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32219 tapered roller bearing?", "a": "A 32219 single-row metric tapered roller bearing per ISO 355 has a 95 mm bore, 170 mm outer diameter and 45.5 mm total assembly width (3.74 × 6.693 × 1.791 in), a 37.5 mm radial section and roughly 3624 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32219 bore code work?", "a": "The last two digits of 32219 are bore code 19, giving 19 × 5 = 95 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 170 mm OD and 45.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32219?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32219 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32219 set?", "a": "At fit-up the 95 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 95 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32219 take axial load in both directions?", "a": "A single 32219 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32220", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 180, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4399, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32220 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 49 mm total assembly width T over the separable cone and cup — 3.937 × 7.087 × 1.929 in, with a 40.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "The large 100 mm-bore 32220 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 100 mm shaft.", "The 322 medium series at 100 mm bore (180×49 mm) gains roller length and load over the 30220 on the same OD; the wider 49 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Check the shoulder geometry for 32220: a generous fillet on the 100 mm shaft looks strong but stops the 49 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section cup presses flush in the 180 mm housing.", "Never fit 32220 by tightening the adjuster to force the cone up the 100 mm taper — draw the nut to seat the rollers, then back it off; the 49 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Inspect the removed 32220 cone and cup as a pair: pitting on the 180 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 100 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Do not swap a 32200 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32220 tapered roller bearing?", "a": "A 32220 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 180 mm outer diameter and 49 mm total assembly width (3.937 × 7.087 × 1.929 in), a 40.0 mm radial section and roughly 4399 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32220 bore code work?", "a": "The last two digits of 32220 are bore code 20, giving 20 × 5 = 100 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 180 mm OD and 49 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32220?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32220 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32220 set?", "a": "At fit-up the 100 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 100 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32220 take axial load in both directions?", "a": "A single 32220 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32221", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 190, "B_mm": 53, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5326, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32221 encode the bore: code 21 = 105 mm (code × 5 from 04 upward). The ISO 355 envelope is 190 mm outside diameter and 53 mm total assembly width T over the separable cone and cup — 4.134 × 7.48 × 2.087 in, with a 42.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "The large 105 mm-bore 32221 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 105 mm shaft.", "The 322 medium series at 105 mm bore (190×53 mm) gains roller length and load over the 30221 on the same OD; the wider 53 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "The 53 mm-wide 32221 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 105 mm bore and 190 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 42.5 mm section.", "When mounting 32221 to a 105 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 190 mm assembly dents the tapered raceway before first run.", "Keep the 32221 pair matched through rebuilds; the 53 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 105 mm shaft alignment.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32221 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32221 tapered roller bearing?", "a": "A 32221 single-row metric tapered roller bearing per ISO 355 has a 105 mm bore, 190 mm outer diameter and 53 mm total assembly width (4.134 × 7.48 × 2.087 in), a 42.5 mm radial section and roughly 5326 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32221 bore code work?", "a": "The last two digits of 32221 are bore code 21, giving 21 × 5 = 105 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 190 mm OD and 53 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32221?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32221 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32221 set?", "a": "At fit-up the 105 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 105 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32221 take axial load in both directions?", "a": "A single 32221 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32221", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32222", "brand": "GENERIC-ISO", "series": "32200-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 200, "B_mm": 56, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 6261, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32200-series the last two digits of 32222 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 355 envelope is 200 mm outside diameter and 56 mm total assembly width T over the separable cone and cup — 4.331 × 7.874 × 2.205 in, with a 45.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "The large 110 mm-bore 32222 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 110 mm shaft.", "The 322 medium series at 110 mm bore (200×56 mm) gains roller length and load over the 30222 on the same OD; the wider 56 mm assembly needs a wider housing shoulder and changes the pinion offset in a differential.", "Before fitting 32222, machine the 110 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 56 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "The 32222 cup drives into the 200 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 56 mm load zone.", "Relubrication for 32222 must reach the rib-roller end contact, not just the 110 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 56 mm-wide assembly or the sliding rib contact starves first.", "A single 32222 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 322-series pair adjusted against each other.", "The cone and the cup of 32222 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32222 tapered roller bearing?", "a": "A 32222 single-row metric tapered roller bearing per ISO 355 has a 110 mm bore, 200 mm outer diameter and 56 mm total assembly width (4.331 × 7.874 × 2.205 in), a 45.0 mm radial section and roughly 6261 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32222 bore code work?", "a": "The last two digits of 32222 are bore code 22, giving 22 × 5 = 110 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 200 mm OD and 56 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32222?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32222 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32222 set?", "a": "At fit-up the 110 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 110 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32222 take axial load in both directions?", "a": "A single 32222 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32304", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 52, "B_mm": 22.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 205, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32304 encode the bore: code 04 = 20 mm (code × 5 from 04 upward). The ISO 355 envelope is 52 mm outside diameter and 22.25 mm total assembly width T over the separable cone and cup — 0.787 × 2.047 × 0.876 in, with a 16.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "At 20 mm bore the small 32304 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 20 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 323 heavy wide series at 20 mm bore (52×22.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 16.0 mm section and 22.25 mm width dwarf the 30204, and its speed ceiling is the lowest of the four series.", "Before fitting 32304, machine the 20 mm shaft seat and 52 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 22.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 16.0 mm radial section.", "The 32304 cup drives into the 52 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 22.25 mm load zone.", "Inspect the removed 32304 cone and cup as a pair: pitting on the 52 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 20 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32304 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32304 tapered roller bearing?", "a": "A 32304 single-row metric tapered roller bearing per ISO 355 has a 20 mm bore, 52 mm outer diameter and 22.25 mm total assembly width (0.787 × 2.047 × 0.876 in), a 16.0 mm radial section and roughly 205 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32304 bore code work?", "a": "The last two digits of 32304 are bore code 04, giving 04 × 5 = 20 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 52 mm OD and 22.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32304?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32304 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32304 set?", "a": "At fit-up the 20 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 20 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32304 take axial load in both directions?", "a": "A single 32304 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32304", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32305", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 62, "B_mm": 25.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 326, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32305 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 355 envelope is 62 mm outside diameter and 25.25 mm total assembly width T over the separable cone and cup — 0.984 × 2.441 × 0.994 in, with a 18.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "At 25 mm bore the small 32305 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 25 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 323 heavy wide series at 25 mm bore (62×25.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 18.5 mm section and 25.25 mm width dwarf the 30205, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32305: a generous fillet on the 25 mm shaft looks strong but stops the 25.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 18.5 mm-section cup presses flush in the 62 mm housing.", "Never fit 32305 by tightening the adjuster to force the cone up the 25 mm taper — draw the nut to seat the rollers, then back it off; the 25.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32305 pair matched through rebuilds; the 25.25 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 25 mm shaft alignment.", "A single 32305 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other.", "The cone and the cup of 32305 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32305 tapered roller bearing?", "a": "A 32305 single-row metric tapered roller bearing per ISO 355 has a 25 mm bore, 62 mm outer diameter and 25.25 mm total assembly width (0.984 × 2.441 × 0.994 in), a 18.5 mm radial section and roughly 326 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32305 bore code work?", "a": "The last two digits of 32305 are bore code 05, giving 05 × 5 = 25 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 62 mm OD and 25.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32305?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32305 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32305 set?", "a": "At fit-up the 25 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 25 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32305 take axial load in both directions?", "a": "A single 32305 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32306", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 72, "B_mm": 28.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 494, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32306 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 355 envelope is 72 mm outside diameter and 28.75 mm total assembly width T over the separable cone and cup — 1.181 × 2.835 × 1.132 in, with a 21.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "At 30 mm bore the small 32306 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 30 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 323 heavy wide series at 30 mm bore (72×28.75 mm) is a steep-angle, high-thrust row for heavy final drives; its 21.0 mm section and 28.75 mm width dwarf the 30206, and its speed ceiling is the lowest of the four series.", "The 28.75 mm-wide 32306 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 72 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 21.0 mm section.", "When mounting 32306 to a 30 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 72 mm assembly dents the tapered raceway before first run.", "Relubrication for 32306 must reach the rib-roller end contact, not just the 30 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 28.75 mm-wide assembly or the sliding rib contact starves first.", "The cone and the cup of 32306 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 30 mm-bore 32306 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32306 tapered roller bearing?", "a": "A 32306 single-row metric tapered roller bearing per ISO 355 has a 30 mm bore, 72 mm outer diameter and 28.75 mm total assembly width (1.181 × 2.835 × 1.132 in), a 21.0 mm radial section and roughly 494 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32306 bore code work?", "a": "The last two digits of 32306 are bore code 06, giving 06 × 5 = 30 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 72 mm OD and 28.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32306?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32306 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32306 set?", "a": "At fit-up the 30 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 30 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32306 take axial load in both directions?", "a": "A single 32306 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32307", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 80, "B_mm": 32.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 679, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32307 encode the bore: code 07 = 35 mm (code × 5 from 04 upward). The ISO 355 envelope is 80 mm outside diameter and 32.75 mm total assembly width T over the separable cone and cup — 1.378 × 3.15 × 1.289 in, with a 22.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts", "agricultural implement wheels" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "At 35 mm bore the small 32307 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 35 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 323 heavy wide series at 35 mm bore (80×32.75 mm) is a steep-angle, high-thrust row for heavy final drives; its 22.5 mm section and 32.75 mm width dwarf the 30207, and its speed ceiling is the lowest of the four series.", "Before fitting 32307, machine the 35 mm shaft seat and 80 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 32.75 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 22.5 mm radial section.", "The 32307 cup drives into the 80 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 32.75 mm load zone.", "Inspect the removed 32307 cone and cup as a pair: pitting on the 80 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 35 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 35 mm-bore 32307 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32307 tapered roller bearing?", "a": "A 32307 single-row metric tapered roller bearing per ISO 355 has a 35 mm bore, 80 mm outer diameter and 32.75 mm total assembly width (1.378 × 3.15 × 1.289 in), a 22.5 mm radial section and roughly 679 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32307 bore code work?", "a": "The last two digits of 32307 are bore code 07, giving 07 × 5 = 35 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 80 mm OD and 32.75 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32307?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32307 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32307 set?", "a": "At fit-up the 35 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 35 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32307 take axial load in both directions?", "a": "A single 32307 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32308", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 90, "B_mm": 35.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 918, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32308 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 355 envelope is 90 mm outside diameter and 35.25 mm total assembly width T over the separable cone and cup — 1.575 × 3.543 × 1.388 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "On this 40 mm-bore 32308, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 40 mm seat can seize hot.", "The 323 heavy wide series at 40 mm bore (90×35.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 25.0 mm section and 35.25 mm width dwarf the 30208, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32308: a generous fillet on the 40 mm shaft looks strong but stops the 35.25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 25.0 mm-section cup presses flush in the 90 mm housing.", "Never fit 32308 by tightening the adjuster to force the cone up the 40 mm taper — draw the nut to seat the rollers, then back it off; the 35.25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32308 pair matched through rebuilds; the 35.25 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 40 mm shaft alignment.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 40 mm shaft or a tilted housing shoulder concentrates load on one end of the 35.25 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32308 tapered roller bearing?", "a": "A 32308 single-row metric tapered roller bearing per ISO 355 has a 40 mm bore, 90 mm outer diameter and 35.25 mm total assembly width (1.575 × 3.543 × 1.388 in), a 25.0 mm radial section and roughly 918 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32308 bore code work?", "a": "The last two digits of 32308 are bore code 08, giving 08 × 5 = 40 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 90 mm OD and 35.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32308?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32308 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32308 set?", "a": "At fit-up the 40 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 40 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32308 take axial load in both directions?", "a": "A single 32308 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32309", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 100, "B_mm": 38.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1222, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32309 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 355 envelope is 100 mm outside diameter and 38.25 mm total assembly width T over the separable cone and cup — 1.772 × 3.937 × 1.506 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "On this 45 mm-bore 32309, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 45 mm seat can seize hot.", "The 323 heavy wide series at 45 mm bore (100×38.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 27.5 mm section and 38.25 mm width dwarf the 30209, and its speed ceiling is the lowest of the four series.", "The 38.25 mm-wide 32309 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 100 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "When mounting 32309 to a 45 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 100 mm assembly dents the tapered raceway before first run.", "Relubrication for 32309 must reach the rib-roller end contact, not just the 45 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 38.25 mm-wide assembly or the sliding rib contact starves first.", "Tapered rollers accept virtually no misalignment; a deflected 45 mm shaft or a tilted housing shoulder concentrates load on one end of the 38.25 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32309 cone onto the 45 mm shaft with force on the inner ring and the cup into the 100 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32309 tapered roller bearing?", "a": "A 32309 single-row metric tapered roller bearing per ISO 355 has a 45 mm bore, 100 mm outer diameter and 38.25 mm total assembly width (1.772 × 3.937 × 1.506 in), a 27.5 mm radial section and roughly 1222 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32309 bore code work?", "a": "The last two digits of 32309 are bore code 09, giving 09 × 5 = 45 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 100 mm OD and 38.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32309?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32309 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32309 set?", "a": "At fit-up the 45 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 45 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32309 take axial load in both directions?", "a": "A single 32309 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32310", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 110, "B_mm": 42.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1625, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32310 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 355 envelope is 110 mm outside diameter and 42.25 mm total assembly width T over the separable cone and cup — 1.969 × 4.331 × 1.663 in, with a 30.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "On this 50 mm-bore 32310, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 50 mm seat can seize hot.", "The 323 heavy wide series at 50 mm bore (110×42.25 mm) is a steep-angle, high-thrust row for heavy final drives; its 30.0 mm section and 42.25 mm width dwarf the 30210, and its speed ceiling is the lowest of the four series.", "Before fitting 32310, machine the 50 mm shaft seat and 110 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 42.25 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "The 32310 cup drives into the 110 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 42.25 mm load zone.", "Inspect the removed 32310 cone and cup as a pair: pitting on the 110 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 50 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Press the 32310 cone onto the 50 mm shaft with force on the inner ring and the cup into the 110 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32300 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32310 tapered roller bearing?", "a": "A 32310 single-row metric tapered roller bearing per ISO 355 has a 50 mm bore, 110 mm outer diameter and 42.25 mm total assembly width (1.969 × 4.331 × 1.663 in), a 30.0 mm radial section and roughly 1625 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32310 bore code work?", "a": "The last two digits of 32310 are bore code 10, giving 10 × 5 = 50 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 110 mm OD and 42.25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32310?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32310 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32310 set?", "a": "At fit-up the 50 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 50 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32310 take axial load in both directions?", "a": "A single 32310 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32311", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 120, "B_mm": 45.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2074, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32311 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 355 envelope is 120 mm outside diameter and 45.5 mm total assembly width T over the separable cone and cup — 2.165 × 4.724 × 1.791 in, with a 32.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "On this 55 mm-bore 32311, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 55 mm seat can seize hot.", "The 323 heavy wide series at 55 mm bore (120×45.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 32.5 mm section and 45.5 mm width dwarf the 30211, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32311: a generous fillet on the 55 mm shaft looks strong but stops the 45.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 32.5 mm-section cup presses flush in the 120 mm housing.", "Never fit 32311 by tightening the adjuster to force the cone up the 55 mm taper — draw the nut to seat the rollers, then back it off; the 45.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32311 pair matched through rebuilds; the 45.5 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 55 mm shaft alignment.", "Do not swap a 32300 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32311 tapered roller bearing?", "a": "A 32311 single-row metric tapered roller bearing per ISO 355 has a 55 mm bore, 120 mm outer diameter and 45.5 mm total assembly width (2.165 × 4.724 × 1.791 in), a 32.5 mm radial section and roughly 2074 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32311 bore code work?", "a": "The last two digits of 32311 are bore code 11, giving 11 × 5 = 55 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 120 mm OD and 45.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32311?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32311 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32311 set?", "a": "At fit-up the 55 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 55 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32311 take axial load in both directions?", "a": "A single 32311 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32312", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 130, "B_mm": 48.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2585, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32312 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 355 envelope is 130 mm outside diameter and 48.5 mm total assembly width T over the separable cone and cup — 2.362 × 5.118 × 1.909 in, with a 35.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "On this 60 mm-bore 32312, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 60 mm seat can seize hot.", "The 323 heavy wide series at 60 mm bore (130×48.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 35.0 mm section and 48.5 mm width dwarf the 30212, and its speed ceiling is the lowest of the four series.", "The 48.5 mm-wide 32312 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 130 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 35.0 mm section.", "When mounting 32312 to a 60 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 130 mm assembly dents the tapered raceway before first run.", "Relubrication for 32312 must reach the rib-roller end contact, not just the 60 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 48.5 mm-wide assembly or the sliding rib contact starves first.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32312 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32312 tapered roller bearing?", "a": "A 32312 single-row metric tapered roller bearing per ISO 355 has a 60 mm bore, 130 mm outer diameter and 48.5 mm total assembly width (2.362 × 5.118 × 1.909 in), a 35.0 mm radial section and roughly 2585 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32312 bore code work?", "a": "The last two digits of 32312 are bore code 12, giving 12 × 5 = 60 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 130 mm OD and 48.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32312?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32312 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32312 set?", "a": "At fit-up the 60 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 60 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32312 take axial load in both directions?", "a": "A single 32312 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32313", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 140, "B_mm": 51, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3142, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32313 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 355 envelope is 140 mm outside diameter and 51 mm total assembly width T over the separable cone and cup — 2.559 × 5.512 × 2.008 in, with a 37.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "On this 65 mm-bore 32313, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 65 mm seat can seize hot.", "The 323 heavy wide series at 65 mm bore (140×51 mm) is a steep-angle, high-thrust row for heavy final drives; its 37.5 mm section and 51 mm width dwarf the 30213, and its speed ceiling is the lowest of the four series.", "Before fitting 32313, machine the 65 mm shaft seat and 140 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 51 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 37.5 mm radial section.", "The 32313 cup drives into the 140 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 51 mm load zone.", "Inspect the removed 32313 cone and cup as a pair: pitting on the 140 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 65 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "A single 32313 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other.", "The cone and the cup of 32313 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32313 tapered roller bearing?", "a": "A 32313 single-row metric tapered roller bearing per ISO 355 has a 65 mm bore, 140 mm outer diameter and 51 mm total assembly width (2.559 × 5.512 × 2.008 in), a 37.5 mm radial section and roughly 3142 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32313 bore code work?", "a": "The last two digits of 32313 are bore code 13, giving 13 × 5 = 65 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 140 mm OD and 51 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32313?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32313 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32313 set?", "a": "At fit-up the 65 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 65 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32313 take axial load in both directions?", "a": "A single 32313 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32314", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 150, "B_mm": 54, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 3809, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32314 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 355 envelope is 150 mm outside diameter and 54 mm total assembly width T over the separable cone and cup — 2.756 × 5.906 × 2.126 in, with a 40.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "On this 70 mm-bore 32314, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 70 mm seat can seize hot.", "The 323 heavy wide series at 70 mm bore (150×54 mm) is a steep-angle, high-thrust row for heavy final drives; its 40.0 mm section and 54 mm width dwarf the 30214, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32314: a generous fillet on the 70 mm shaft looks strong but stops the 54 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 40.0 mm-section cup presses flush in the 150 mm housing.", "Never fit 32314 by tightening the adjuster to force the cone up the 70 mm taper — draw the nut to seat the rollers, then back it off; the 54 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32314 pair matched through rebuilds; the 54 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 70 mm shaft alignment.", "The cone and the cup of 32314 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 70 mm-bore 32314 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32314 tapered roller bearing?", "a": "A 32314 single-row metric tapered roller bearing per ISO 355 has a 70 mm bore, 150 mm outer diameter and 54 mm total assembly width (2.756 × 5.906 × 2.126 in), a 40.0 mm radial section and roughly 3809 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32314 bore code work?", "a": "The last two digits of 32314 are bore code 14, giving 14 × 5 = 70 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 150 mm OD and 54 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32314?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32314 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32314 set?", "a": "At fit-up the 70 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 70 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32314 take axial load in both directions?", "a": "A single 32314 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32315", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 160, "B_mm": 58, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4643, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32315 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 355 envelope is 160 mm outside diameter and 58 mm total assembly width T over the separable cone and cup — 2.953 × 6.299 × 2.283 in, with a 42.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "On this 75 mm-bore 32315, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 75 mm seat can seize hot.", "The 323 heavy wide series at 75 mm bore (160×58 mm) is a steep-angle, high-thrust row for heavy final drives; its 42.5 mm section and 58 mm width dwarf the 30215, and its speed ceiling is the lowest of the four series.", "The 58 mm-wide 32315 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 160 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 42.5 mm section.", "When mounting 32315 to a 75 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 160 mm assembly dents the tapered raceway before first run.", "Relubrication for 32315 must reach the rib-roller end contact, not just the 75 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 58 mm-wide assembly or the sliding rib contact starves first.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 75 mm-bore 32315 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32315 tapered roller bearing?", "a": "A 32315 single-row metric tapered roller bearing per ISO 355 has a 75 mm bore, 160 mm outer diameter and 58 mm total assembly width (2.953 × 6.299 × 2.283 in), a 42.5 mm radial section and roughly 4643 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32315 bore code work?", "a": "The last two digits of 32315 are bore code 15, giving 15 × 5 = 75 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 160 mm OD and 58 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32315?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32315 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32315 set?", "a": "At fit-up the 75 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 75 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32315 take axial load in both directions?", "a": "A single 32315 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32316", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 170, "B_mm": 61.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5545, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32316 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 355 envelope is 170 mm outside diameter and 61.5 mm total assembly width T over the separable cone and cup — 3.15 × 6.693 × 2.421 in, with a 45.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "The large 80 mm-bore 32316 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 80 mm shaft.", "The 323 heavy wide series at 80 mm bore (170×61.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 45.0 mm section and 61.5 mm width dwarf the 30216, and its speed ceiling is the lowest of the four series.", "Before fitting 32316, machine the 80 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 61.5 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.", "The 32316 cup drives into the 170 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 61.5 mm load zone.", "Inspect the removed 32316 cone and cup as a pair: pitting on the 170 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 80 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 80 mm shaft or a tilted housing shoulder concentrates load on one end of the 61.5 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32316 tapered roller bearing?", "a": "A 32316 single-row metric tapered roller bearing per ISO 355 has a 80 mm bore, 170 mm outer diameter and 61.5 mm total assembly width (3.15 × 6.693 × 2.421 in), a 45.0 mm radial section and roughly 5545 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32316 bore code work?", "a": "The last two digits of 32316 are bore code 16, giving 16 × 5 = 80 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 170 mm OD and 61.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32316?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32316 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32316 set?", "a": "At fit-up the 80 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 80 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32316 take axial load in both directions?", "a": "A single 32316 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32317", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 180, "B_mm": 63.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 6406, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32317 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 63.5 mm total assembly width T over the separable cone and cup — 3.346 × 7.087 × 2.5 in, with a 47.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "The large 85 mm-bore 32317 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 85 mm shaft.", "The 323 heavy wide series at 85 mm bore (180×63.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 47.5 mm section and 63.5 mm width dwarf the 30217, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32317: a generous fillet on the 85 mm shaft looks strong but stops the 63.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 47.5 mm-section cup presses flush in the 180 mm housing.", "Never fit 32317 by tightening the adjuster to force the cone up the 85 mm taper — draw the nut to seat the rollers, then back it off; the 63.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32317 pair matched through rebuilds; the 63.5 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 85 mm shaft alignment.", "Tapered rollers accept virtually no misalignment; a deflected 85 mm shaft or a tilted housing shoulder concentrates load on one end of the 63.5 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32317 cone onto the 85 mm shaft with force on the inner ring and the cup into the 180 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32317 tapered roller bearing?", "a": "A 32317 single-row metric tapered roller bearing per ISO 355 has a 85 mm bore, 180 mm outer diameter and 63.5 mm total assembly width (3.346 × 7.087 × 2.5 in), a 47.5 mm radial section and roughly 6406 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32317 bore code work?", "a": "The last two digits of 32317 are bore code 17, giving 17 × 5 = 85 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 180 mm OD and 63.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32317?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32317 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32317 set?", "a": "At fit-up the 85 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 85 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32317 take axial load in both directions?", "a": "A single 32317 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32318", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 190, "B_mm": 67.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 7574, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32318 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 355 envelope is 190 mm outside diameter and 67.5 mm total assembly width T over the separable cone and cup — 3.543 × 7.48 × 2.657 in, with a 50.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "The large 90 mm-bore 32318 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 90 mm shaft.", "The 323 heavy wide series at 90 mm bore (190×67.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 50.0 mm section and 67.5 mm width dwarf the 30218, and its speed ceiling is the lowest of the four series.", "The 67.5 mm-wide 32318 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 190 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 50.0 mm section.", "When mounting 32318 to a 90 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 190 mm assembly dents the tapered raceway before first run.", "Relubrication for 32318 must reach the rib-roller end contact, not just the 90 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 67.5 mm-wide assembly or the sliding rib contact starves first.", "Press the 32318 cone onto the 90 mm shaft with force on the inner ring and the cup into the 190 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32300 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32318 tapered roller bearing?", "a": "A 32318 single-row metric tapered roller bearing per ISO 355 has a 90 mm bore, 190 mm outer diameter and 67.5 mm total assembly width (3.543 × 7.48 × 2.657 in), a 50.0 mm radial section and roughly 7574 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32318 bore code work?", "a": "The last two digits of 32318 are bore code 18, giving 18 × 5 = 90 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 190 mm OD and 67.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32318?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32318 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32318 set?", "a": "At fit-up the 90 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 90 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32318 take axial load in both directions?", "a": "A single 32318 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32319", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 200, "B_mm": 71.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 8875, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32319 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 355 envelope is 200 mm outside diameter and 71.5 mm total assembly width T over the separable cone and cup — 3.74 × 7.874 × 2.815 in, with a 52.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "The large 95 mm-bore 32319 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 95 mm shaft.", "The 323 heavy wide series at 95 mm bore (200×71.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 52.5 mm section and 71.5 mm width dwarf the 30219, and its speed ceiling is the lowest of the four series.", "Before fitting 32319, machine the 95 mm shaft seat and 200 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 71.5 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 52.5 mm radial section.", "The 32319 cup drives into the 200 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 71.5 mm load zone.", "Inspect the removed 32319 cone and cup as a pair: pitting on the 200 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 95 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Do not swap a 32300 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32319 tapered roller bearing?", "a": "A 32319 single-row metric tapered roller bearing per ISO 355 has a 95 mm bore, 200 mm outer diameter and 71.5 mm total assembly width (3.74 × 7.874 × 2.815 in), a 52.5 mm radial section and roughly 8875 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32319 bore code work?", "a": "The last two digits of 32319 are bore code 19, giving 19 × 5 = 95 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 200 mm OD and 71.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32319?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32319 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32319 set?", "a": "At fit-up the 95 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 95 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32319 take axial load in both directions?", "a": "A single 32319 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32320", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 215, "B_mm": 77.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 11251, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32320 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 215 mm outside diameter and 77.5 mm total assembly width T over the separable cone and cup — 3.937 × 8.465 × 3.051 in, with a 57.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "The large 100 mm-bore 32320 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 100 mm shaft.", "The 323 heavy wide series at 100 mm bore (215×77.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 57.5 mm section and 77.5 mm width dwarf the 30220, and its speed ceiling is the lowest of the four series.", "Check the shoulder geometry for 32320: a generous fillet on the 100 mm shaft looks strong but stops the 77.5 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 57.5 mm-section cup presses flush in the 215 mm housing.", "Never fit 32320 by tightening the adjuster to force the cone up the 100 mm taper — draw the nut to seat the rollers, then back it off; the 77.5 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Keep the 32320 pair matched through rebuilds; the 77.5 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 100 mm shaft alignment.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32320 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32320 tapered roller bearing?", "a": "A 32320 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 215 mm outer diameter and 77.5 mm total assembly width (3.937 × 8.465 × 3.051 in), a 57.5 mm radial section and roughly 11251 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32320 bore code work?", "a": "The last two digits of 32320 are bore code 20, giving 20 × 5 = 100 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 215 mm OD and 77.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32320?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32320 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32320 set?", "a": "At fit-up the 100 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 100 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32320 take axial load in both directions?", "a": "A single 32320 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32321", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 225, "B_mm": 81.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 12934, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32321 encode the bore: code 21 = 105 mm (code × 5 from 04 upward). The ISO 355 envelope is 225 mm outside diameter and 81.5 mm total assembly width T over the separable cone and cup — 4.134 × 8.858 × 3.209 in, with a 60.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "The large 105 mm-bore 32321 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 105 mm shaft.", "The 323 heavy wide series at 105 mm bore (225×81.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 60.0 mm section and 81.5 mm width dwarf the 30221, and its speed ceiling is the lowest of the four series.", "The 81.5 mm-wide 32321 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 105 mm bore and 225 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 60.0 mm section.", "When mounting 32321 to a 105 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 225 mm assembly dents the tapered raceway before first run.", "Relubrication for 32321 must reach the rib-roller end contact, not just the 105 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 81.5 mm-wide assembly or the sliding rib contact starves first.", "A single 32321 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 323-series pair adjusted against each other.", "The cone and the cup of 32321 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32321 tapered roller bearing?", "a": "A 32321 single-row metric tapered roller bearing per ISO 355 has a 105 mm bore, 225 mm outer diameter and 81.5 mm total assembly width (4.134 × 8.858 × 3.209 in), a 60.0 mm radial section and roughly 12934 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32321 bore code work?", "a": "The last two digits of 32321 are bore code 21, giving 21 × 5 = 105 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 225 mm OD and 81.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32321?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32321 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32321 set?", "a": "At fit-up the 105 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 105 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32321 take axial load in both directions?", "a": "A single 32321 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32321", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32322", "brand": "GENERIC-ISO", "series": "32300-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 240, "B_mm": 84.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 15408, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32300-series the last two digits of 32322 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 355 envelope is 240 mm outside diameter and 84.5 mm total assembly width T over the separable cone and cup — 4.331 × 9.449 × 3.327 in, with a 65.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "The large 110 mm-bore 32322 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 110 mm shaft.", "The 323 heavy wide series at 110 mm bore (240×84.5 mm) is a steep-angle, high-thrust row for heavy final drives; its 65.0 mm section and 84.5 mm width dwarf the 30222, and its speed ceiling is the lowest of the four series.", "Before fitting 32322, machine the 110 mm shaft seat and 240 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 84.5 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 65.0 mm radial section.", "The 32322 cup drives into the 240 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 84.5 mm load zone.", "Inspect the removed 32322 cone and cup as a pair: pitting on the 240 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 110 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The cone and the cup of 32322 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 110 mm-bore 32322 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32322 tapered roller bearing?", "a": "A 32322 single-row metric tapered roller bearing per ISO 355 has a 110 mm bore, 240 mm outer diameter and 84.5 mm total assembly width (4.331 × 9.449 × 3.327 in), a 65.0 mm radial section and roughly 15408 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32322 bore code work?", "a": "The last two digits of 32322 are bore code 22, giving 22 × 5 = 110 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 240 mm OD and 84.5 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32322?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32322 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32322 set?", "a": "At fit-up the 110 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 110 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32322 take axial load in both directions?", "a": "A single 32322 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32004", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 42, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 82, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32004 encode the bore: code 04 = 20 mm (code × 5 from 04 upward). The ISO 355 envelope is 42 mm outside diameter and 15 mm total assembly width T over the separable cone and cup — 0.787 × 1.654 × 0.591 in, with a 11.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "passenger-car wheel hubs", "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "At 20 mm bore the small 32004 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 20 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 320 narrow series at 20 mm bore keeps the OD down to 42 mm for space-limited hubs; its 15 mm width carries less load than a 30204, so do not substitute it into a 302 application without re-rating.", "Before fitting 32004, machine the 20 mm shaft seat and 42 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 15 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 11.0 mm radial section.", "The 32004 cup drives into the 42 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 15 mm load zone.", "Keep the 32004 pair matched through rebuilds; the 15 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 20 mm shaft alignment.", "Press the 32004 cone onto the 20 mm shaft with force on the inner ring and the cup into the 42 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32004 tapered roller bearing?", "a": "A 32004 single-row metric tapered roller bearing per ISO 355 has a 20 mm bore, 42 mm outer diameter and 15 mm total assembly width (0.787 × 1.654 × 0.591 in), a 11.0 mm radial section and roughly 82 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32004 bore code work?", "a": "The last two digits of 32004 are bore code 04, giving 04 × 5 = 20 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 42 mm OD and 15 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32004?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32004 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32004 set?", "a": "At fit-up the 20 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 20 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32004 take axial load in both directions?", "a": "A single 32004 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32005", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 47, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 95, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32005 encode the bore: code 05 = 25 mm (code × 5 from 04 upward). The ISO 355 envelope is 47 mm outside diameter and 15 mm total assembly width T over the separable cone and cup — 0.984 × 1.85 × 0.591 in, with a 11.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "small trailer axles", "light differential pinions", "steering knuckles", "small gearbox shafts", "agricultural implement wheels" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "At 25 mm bore the small 32005 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 25 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 320 narrow series at 25 mm bore keeps the OD down to 47 mm for space-limited hubs; its 15 mm width carries less load than a 30205, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32005: a generous fillet on the 25 mm shaft looks strong but stops the 15 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 11.0 mm-section cup presses flush in the 47 mm housing.", "Never fit 32005 by tightening the adjuster to force the cone up the 25 mm taper — draw the nut to seat the rollers, then back it off; the 15 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32005 must reach the rib-roller end contact, not just the 25 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 15 mm-wide assembly or the sliding rib contact starves first.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32005 tapered roller bearing?", "a": "A 32005 single-row metric tapered roller bearing per ISO 355 has a 25 mm bore, 47 mm outer diameter and 15 mm total assembly width (0.984 × 1.85 × 0.591 in), a 11.0 mm radial section and roughly 95 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32005 bore code work?", "a": "The last two digits of 32005 are bore code 05, giving 05 × 5 = 25 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 47 mm OD and 15 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32005?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32005 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32005 set?", "a": "At fit-up the 25 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 25 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32005 take axial load in both directions?", "a": "A single 32005 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32006", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 55, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 145, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32006 encode the bore: code 06 = 30 mm (code × 5 from 04 upward). The ISO 355 envelope is 55 mm outside diameter and 17 mm total assembly width T over the separable cone and cup — 1.181 × 2.165 × 0.669 in, with a 12.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light differential pinions", "steering knuckles", "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "At 30 mm bore the small 32006 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 30 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 320 narrow series at 30 mm bore keeps the OD down to 55 mm for space-limited hubs; its 17 mm width carries less load than a 30206, so do not substitute it into a 302 application without re-rating.", "The 17 mm-wide 32006 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 30 mm bore and 55 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 12.5 mm section.", "When mounting 32006 to a 30 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 55 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32006 cone and cup as a pair: pitting on the 55 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 30 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32006 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32006 tapered roller bearing?", "a": "A 32006 single-row metric tapered roller bearing per ISO 355 has a 30 mm bore, 55 mm outer diameter and 17 mm total assembly width (1.181 × 2.165 × 0.669 in), a 12.5 mm radial section and roughly 145 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32006 bore code work?", "a": "The last two digits of 32006 are bore code 06, giving 06 × 5 = 30 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 55 mm OD and 17 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32006?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32006 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32006 set?", "a": "At fit-up the 30 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 30 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32006 take axial load in both directions?", "a": "A single 32006 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32007", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 62, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 189, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32007 encode the bore: code 07 = 35 mm (code × 5 from 04 upward). The ISO 355 envelope is 62 mm outside diameter and 18 mm total assembly width T over the separable cone and cup — 1.378 × 2.441 × 0.709 in, with a 13.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "steering knuckles", "small gearbox shafts", "agricultural implement wheels", "passenger-car wheel hubs", "small trailer axles" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "At 35 mm bore the small 32007 is commonly factory-adjusted in a hub unit; an after-market fit-up must reproduce the specified end play (a typical starting range of 0.02–0.10 mm at the 35 mm shaft) or the wheel runs hot within the first hundred kilometres.", "The 320 narrow series at 35 mm bore keeps the OD down to 62 mm for space-limited hubs; its 18 mm width carries less load than a 30207, so do not substitute it into a 302 application without re-rating.", "Before fitting 32007, machine the 35 mm shaft seat and 62 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 18 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 13.5 mm radial section.", "The 32007 cup drives into the 62 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 18 mm load zone.", "Keep the 32007 pair matched through rebuilds; the 18 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 35 mm shaft alignment.", "A single 32007 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other.", "The cone and the cup of 32007 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32007 tapered roller bearing?", "a": "A 32007 single-row metric tapered roller bearing per ISO 355 has a 35 mm bore, 62 mm outer diameter and 18 mm total assembly width (1.378 × 2.441 × 0.709 in), a 13.5 mm radial section and roughly 189 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32007 bore code work?", "a": "The last two digits of 32007 are bore code 07, giving 07 × 5 = 35 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 62 mm OD and 18 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32007?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32007 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32007 set?", "a": "At fit-up the 35 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.02–0.10 mm for a 35 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32007 take axial load in both directions?", "a": "A single 32007 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32008", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 68, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 230, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32008 encode the bore: code 08 = 40 mm (code × 5 from 04 upward). The ISO 355 envelope is 68 mm outside diameter and 19 mm total assembly width T over the separable cone and cup — 1.575 × 2.677 × 0.748 in, with a 14.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "On this 40 mm-bore 32008, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 40 mm seat can seize hot.", "The 320 narrow series at 40 mm bore keeps the OD down to 68 mm for space-limited hubs; its 19 mm width carries less load than a 30208, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32008: a generous fillet on the 40 mm shaft looks strong but stops the 19 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 14.0 mm-section cup presses flush in the 68 mm housing.", "Never fit 32008 by tightening the adjuster to force the cone up the 40 mm taper — draw the nut to seat the rollers, then back it off; the 19 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32008 must reach the rib-roller end contact, not just the 40 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 19 mm-wide assembly or the sliding rib contact starves first.", "The cone and the cup of 32008 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 40 mm-bore 32008 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32008 tapered roller bearing?", "a": "A 32008 single-row metric tapered roller bearing per ISO 355 has a 40 mm bore, 68 mm outer diameter and 19 mm total assembly width (1.575 × 2.677 × 0.748 in), a 14.0 mm radial section and roughly 230 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32008 bore code work?", "a": "The last two digits of 32008 are bore code 08, giving 08 × 5 = 40 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 68 mm OD and 19 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32008?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32008 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32008 set?", "a": "At fit-up the 40 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 40 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32008 take axial load in both directions?", "a": "A single 32008 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32009", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 75, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 289, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32009 encode the bore: code 09 = 45 mm (code × 5 from 04 upward). The ISO 355 envelope is 75 mm outside diameter and 20 mm total assembly width T over the separable cone and cup — 1.772 × 2.953 × 0.787 in, with a 15.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "On this 45 mm-bore 32009, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 45 mm seat can seize hot.", "The 320 narrow series at 45 mm bore keeps the OD down to 75 mm for space-limited hubs; its 20 mm width carries less load than a 30209, so do not substitute it into a 302 application without re-rating.", "The 20 mm-wide 32009 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 45 mm bore and 75 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 15.0 mm section.", "When mounting 32009 to a 45 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 75 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32009 cone and cup as a pair: pitting on the 75 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 45 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 45 mm-bore 32009 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32009 tapered roller bearing?", "a": "A 32009 single-row metric tapered roller bearing per ISO 355 has a 45 mm bore, 75 mm outer diameter and 20 mm total assembly width (1.772 × 2.953 × 0.787 in), a 15.0 mm radial section and roughly 289 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32009 bore code work?", "a": "The last two digits of 32009 are bore code 09, giving 09 × 5 = 45 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 75 mm OD and 20 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32009?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32009 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32009 set?", "a": "At fit-up the 45 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 45 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32009 take axial load in both directions?", "a": "A single 32009 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32010", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 80, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 313, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32010 encode the bore: code 10 = 50 mm (code × 5 from 04 upward). The ISO 355 envelope is 80 mm outside diameter and 20 mm total assembly width T over the separable cone and cup — 1.969 × 3.15 × 0.787 in, with a 15.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "On this 50 mm-bore 32010, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 50 mm seat can seize hot.", "The 320 narrow series at 50 mm bore keeps the OD down to 80 mm for space-limited hubs; its 20 mm width carries less load than a 30210, so do not substitute it into a 302 application without re-rating.", "Before fitting 32010, machine the 50 mm shaft seat and 80 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 20 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 15.0 mm radial section.", "The 32010 cup drives into the 80 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 20 mm load zone.", "Keep the 32010 pair matched through rebuilds; the 20 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 50 mm shaft alignment.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 50 mm shaft or a tilted housing shoulder concentrates load on one end of the 20 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32010 tapered roller bearing?", "a": "A 32010 single-row metric tapered roller bearing per ISO 355 has a 50 mm bore, 80 mm outer diameter and 20 mm total assembly width (1.969 × 3.15 × 0.787 in), a 15.0 mm radial section and roughly 313 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32010 bore code work?", "a": "The last two digits of 32010 are bore code 10, giving 10 × 5 = 50 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 80 mm OD and 20 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32010?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32010 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32010 set?", "a": "At fit-up the 50 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 50 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32010 take axial load in both directions?", "a": "A single 32010 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32011", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 468, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32011 encode the bore: code 11 = 55 mm (code × 5 from 04 upward). The ISO 355 envelope is 90 mm outside diameter and 23 mm total assembly width T over the separable cone and cup — 2.165 × 3.543 × 0.906 in, with a 17.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "On this 55 mm-bore 32011, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 55 mm seat can seize hot.", "The 320 narrow series at 55 mm bore keeps the OD down to 90 mm for space-limited hubs; its 23 mm width carries less load than a 30211, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32011: a generous fillet on the 55 mm shaft looks strong but stops the 23 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 17.5 mm-section cup presses flush in the 90 mm housing.", "Never fit 32011 by tightening the adjuster to force the cone up the 55 mm taper — draw the nut to seat the rollers, then back it off; the 23 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32011 must reach the rib-roller end contact, not just the 55 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 23 mm-wide assembly or the sliding rib contact starves first.", "Tapered rollers accept virtually no misalignment; a deflected 55 mm shaft or a tilted housing shoulder concentrates load on one end of the 23 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32011 cone onto the 55 mm shaft with force on the inner ring and the cup into the 90 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32011 tapered roller bearing?", "a": "A 32011 single-row metric tapered roller bearing per ISO 355 has a 55 mm bore, 90 mm outer diameter and 23 mm total assembly width (2.165 × 3.543 × 0.906 in), a 17.5 mm radial section and roughly 468 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32011 bore code work?", "a": "The last two digits of 32011 are bore code 11, giving 11 × 5 = 55 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 90 mm OD and 23 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32011?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32011 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32011 set?", "a": "At fit-up the 55 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 55 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32011 take axial load in both directions?", "a": "A single 32011 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32012", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 95, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 500, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32012 encode the bore: code 12 = 60 mm (code × 5 from 04 upward). The ISO 355 envelope is 95 mm outside diameter and 23 mm total assembly width T over the separable cone and cup — 2.362 × 3.74 × 0.906 in, with a 17.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "commercial gearbox input/output shafts", "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "On this 60 mm-bore 32012, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 60 mm seat can seize hot.", "The 320 narrow series at 60 mm bore keeps the OD down to 95 mm for space-limited hubs; its 23 mm width carries less load than a 30212, so do not substitute it into a 302 application without re-rating.", "The 23 mm-wide 32012 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 60 mm bore and 95 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 17.5 mm section.", "When mounting 32012 to a 60 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 95 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32012 cone and cup as a pair: pitting on the 95 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 60 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Press the 32012 cone onto the 60 mm shaft with force on the inner ring and the cup into the 95 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32012 tapered roller bearing?", "a": "A 32012 single-row metric tapered roller bearing per ISO 355 has a 60 mm bore, 95 mm outer diameter and 23 mm total assembly width (2.362 × 3.74 × 0.906 in), a 17.5 mm radial section and roughly 500 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32012 bore code work?", "a": "The last two digits of 32012 are bore code 12, giving 12 × 5 = 60 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 95 mm OD and 23 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32012?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32012 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32012 set?", "a": "At fit-up the 60 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 60 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32012 take axial load in both directions?", "a": "A single 32012 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32013", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 100, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 532, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32013 encode the bore: code 13 = 65 mm (code × 5 from 04 upward). The ISO 355 envelope is 100 mm outside diameter and 23 mm total assembly width T over the separable cone and cup — 2.559 × 3.937 × 0.906 in, with a 17.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "conveyor head and tail pulleys", "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "On this 65 mm-bore 32013, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 65 mm seat can seize hot.", "The 320 narrow series at 65 mm bore keeps the OD down to 100 mm for space-limited hubs; its 23 mm width carries less load than a 30213, so do not substitute it into a 302 application without re-rating.", "Before fitting 32013, machine the 65 mm shaft seat and 100 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 23 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 17.5 mm radial section.", "The 32013 cup drives into the 100 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 23 mm load zone.", "Keep the 32013 pair matched through rebuilds; the 23 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 65 mm shaft alignment.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32013 tapered roller bearing?", "a": "A 32013 single-row metric tapered roller bearing per ISO 355 has a 65 mm bore, 100 mm outer diameter and 23 mm total assembly width (2.559 × 3.937 × 0.906 in), a 17.5 mm radial section and roughly 532 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32013 bore code work?", "a": "The last two digits of 32013 are bore code 13, giving 13 × 5 = 65 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 100 mm OD and 23 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32013?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32013 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32013 set?", "a": "At fit-up the 65 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 65 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32013 take axial load in both directions?", "a": "A single 32013 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32014", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 110, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 721, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32014 encode the bore: code 14 = 70 mm (code × 5 from 04 upward). The ISO 355 envelope is 110 mm outside diameter and 25 mm total assembly width T over the separable cone and cup — 2.756 × 4.331 × 0.984 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "fork-lift steer axles", "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "On this 70 mm-bore 32014, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 70 mm seat can seize hot.", "The 320 narrow series at 70 mm bore keeps the OD down to 110 mm for space-limited hubs; its 25 mm width carries less load than a 30214, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32014: a generous fillet on the 70 mm shaft looks strong but stops the 25 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 20.0 mm-section cup presses flush in the 110 mm housing.", "Never fit 32014 by tightening the adjuster to force the cone up the 70 mm taper — draw the nut to seat the rollers, then back it off; the 25 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32014 must reach the rib-roller end contact, not just the 70 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 25 mm-wide assembly or the sliding rib contact starves first.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32014 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32014 tapered roller bearing?", "a": "A 32014 single-row metric tapered roller bearing per ISO 355 has a 70 mm bore, 110 mm outer diameter and 25 mm total assembly width (2.756 × 4.331 × 0.984 in), a 20.0 mm radial section and roughly 721 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32014 bore code work?", "a": "The last two digits of 32014 are bore code 14, giving 14 × 5 = 70 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 110 mm OD and 25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32014?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32014 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32014 set?", "a": "At fit-up the 70 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 70 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32014 take axial load in both directions?", "a": "A single 32014 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32015", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 115, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 761, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32015 encode the bore: code 15 = 75 mm (code × 5 from 04 upward). The ISO 355 envelope is 115 mm outside diameter and 25 mm total assembly width T over the separable cone and cup — 2.953 × 4.528 × 0.984 in, with a 20.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "industrial transmission shafts", "light-truck and van wheel hubs", "final-drive pinion and differential bearings", "commercial gearbox input/output shafts", "conveyor head and tail pulleys" ], "failure_modes": [ "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear" ], "pitfalls": [ "On this 75 mm-bore 32015, thermal growth of the shaft closes up the adjusted clearance; set cold end play around 0.03–0.12 mm and recheck after the first hot run — a medium-series cone that was correct cold on the 75 mm seat can seize hot.", "The 320 narrow series at 75 mm bore keeps the OD down to 115 mm for space-limited hubs; its 25 mm width carries less load than a 30215, so do not substitute it into a 302 application without re-rating.", "The 25 mm-wide 32015 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 75 mm bore and 115 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 20.0 mm section.", "When mounting 32015 to a 75 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 115 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32015 cone and cup as a pair: pitting on the 115 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 75 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "A single 32015 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other.", "The cone and the cup of 32015 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands." ], "faq": [ { "q": "What are the dimensions of a 32015 tapered roller bearing?", "a": "A 32015 single-row metric tapered roller bearing per ISO 355 has a 75 mm bore, 115 mm outer diameter and 25 mm total assembly width (2.953 × 4.528 × 0.984 in), a 20.0 mm radial section and roughly 761 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32015 bore code work?", "a": "The last two digits of 32015 are bore code 15, giving 15 × 5 = 75 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 115 mm OD and 25 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32015?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32015 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32015 set?", "a": "At fit-up the 75 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.03–0.12 mm for a 75 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32015 take axial load in both directions?", "a": "A single 32015 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32016", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 125, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1072, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32016 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 355 envelope is 125 mm outside diameter and 29 mm total assembly width T over the separable cone and cup — 3.15 × 4.921 × 1.142 in, with a 22.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "The large 80 mm-bore 32016 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 80 mm shaft.", "The 320 narrow series at 80 mm bore keeps the OD down to 125 mm for space-limited hubs; its 29 mm width carries less load than a 30216, so do not substitute it into a 302 application without re-rating.", "Before fitting 32016, machine the 80 mm shaft seat and 125 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 29 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 22.5 mm radial section.", "The 32016 cup drives into the 125 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 29 mm load zone.", "Keep the 32016 pair matched through rebuilds; the 29 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 80 mm shaft alignment.", "The cone and the cup of 32016 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 80 mm-bore 32016 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32016 tapered roller bearing?", "a": "A 32016 single-row metric tapered roller bearing per ISO 355 has a 80 mm bore, 125 mm outer diameter and 29 mm total assembly width (3.15 × 4.921 × 1.142 in), a 22.5 mm radial section and roughly 1072 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32016 bore code work?", "a": "The last two digits of 32016 are bore code 16, giving 16 × 5 = 80 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 125 mm OD and 29 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32016?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32016 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32016 set?", "a": "At fit-up the 80 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 80 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32016 take axial load in both directions?", "a": "A single 32016 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32017", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 130, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1124, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32017 encode the bore: code 17 = 85 mm (code × 5 from 04 upward). The ISO 355 envelope is 130 mm outside diameter and 29 mm total assembly width T over the separable cone and cup — 3.346 × 5.118 × 1.142 in, with a 22.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles" ], "failure_modes": [ "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film" ], "pitfalls": [ "The large 85 mm-bore 32017 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 85 mm shaft.", "The 320 narrow series at 85 mm bore keeps the OD down to 130 mm for space-limited hubs; its 29 mm width carries less load than a 30217, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32017: a generous fillet on the 85 mm shaft looks strong but stops the 29 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 22.5 mm-section cup presses flush in the 130 mm housing.", "Never fit 32017 by tightening the adjuster to force the cone up the 85 mm taper — draw the nut to seat the rollers, then back it off; the 29 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32017 must reach the rib-roller end contact, not just the 85 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 29 mm-wide assembly or the sliding rib contact starves first.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 85 mm-bore 32017 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run." ], "faq": [ { "q": "What are the dimensions of a 32017 tapered roller bearing?", "a": "A 32017 single-row metric tapered roller bearing per ISO 355 has a 85 mm bore, 130 mm outer diameter and 29 mm total assembly width (3.346 × 5.118 × 1.142 in), a 22.5 mm radial section and roughly 1124 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32017 bore code work?", "a": "The last two digits of 32017 are bore code 17, giving 17 × 5 = 85 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 130 mm OD and 29 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32017?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32017 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32017 set?", "a": "At fit-up the 85 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 85 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32017 take axial load in both directions?", "a": "A single 32017 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32018", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 140, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1475, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32018 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 355 envelope is 140 mm outside diameter and 32 mm total assembly width T over the separable cone and cup — 3.543 × 5.512 × 1.26 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "The large 90 mm-bore 32018 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 90 mm shaft.", "The 320 narrow series at 90 mm bore keeps the OD down to 140 mm for space-limited hubs; its 32 mm width carries less load than a 30218, so do not substitute it into a 302 application without re-rating.", "The 32 mm-wide 32018 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 140 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.", "When mounting 32018 to a 90 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 140 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32018 cone and cup as a pair: pitting on the 140 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 90 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 90 mm shaft or a tilted housing shoulder concentrates load on one end of the 32 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32018 tapered roller bearing?", "a": "A 32018 single-row metric tapered roller bearing per ISO 355 has a 90 mm bore, 140 mm outer diameter and 32 mm total assembly width (3.543 × 5.512 × 1.26 in), a 25.0 mm radial section and roughly 1475 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32018 bore code work?", "a": "The last two digits of 32018 are bore code 18, giving 18 × 5 = 90 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 140 mm OD and 32 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32018?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32018 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32018 set?", "a": "At fit-up the 90 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 90 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32018 take axial load in both directions?", "a": "A single 32018 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32019", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 145, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1539, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32019 encode the bore: code 19 = 95 mm (code × 5 from 04 upward). The ISO 355 envelope is 145 mm outside diameter and 32 mm total assembly width T over the separable cone and cup — 3.74 × 5.709 × 1.26 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials" ], "failure_modes": [ "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat" ], "pitfalls": [ "The large 95 mm-bore 32019 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 95 mm shaft.", "The 320 narrow series at 95 mm bore keeps the OD down to 145 mm for space-limited hubs; its 32 mm width carries less load than a 30219, so do not substitute it into a 302 application without re-rating.", "Before fitting 32019, machine the 95 mm shaft seat and 145 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 32 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 25.0 mm radial section.", "The 32019 cup drives into the 145 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 32 mm load zone.", "Keep the 32019 pair matched through rebuilds; the 32 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 95 mm shaft alignment.", "Tapered rollers accept virtually no misalignment; a deflected 95 mm shaft or a tilted housing shoulder concentrates load on one end of the 32 mm-wide roller row — align seats and verify housing perpendicularity.", "Press the 32019 cone onto the 95 mm shaft with force on the inner ring and the cup into the 145 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways." ], "faq": [ { "q": "What are the dimensions of a 32019 tapered roller bearing?", "a": "A 32019 single-row metric tapered roller bearing per ISO 355 has a 95 mm bore, 145 mm outer diameter and 32 mm total assembly width (3.74 × 5.709 × 1.26 in), a 25.0 mm radial section and roughly 1539 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32019 bore code work?", "a": "The last two digits of 32019 are bore code 19, giving 19 × 5 = 95 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 145 mm OD and 32 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32019?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32019 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32019 set?", "a": "At fit-up the 95 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 95 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32019 take axial load in both directions?", "a": "A single 32019 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32020", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 150, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 1603, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32020 encode the bore: code 20 = 100 mm (code × 5 from 04 upward). The ISO 355 envelope is 150 mm outside diameter and 32 mm total assembly width T over the separable cone and cup — 3.937 × 5.906 × 1.26 in, with a 25.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "The large 100 mm-bore 32020 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 100 mm shaft.", "The 320 narrow series at 100 mm bore keeps the OD down to 150 mm for space-limited hubs; its 32 mm width carries less load than a 30220, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32020: a generous fillet on the 100 mm shaft looks strong but stops the 32 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 25.0 mm-section cup presses flush in the 150 mm housing.", "Never fit 32020 by tightening the adjuster to force the cone up the 100 mm taper — draw the nut to seat the rollers, then back it off; the 32 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32020 must reach the rib-roller end contact, not just the 100 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 32 mm-wide assembly or the sliding rib contact starves first.", "Press the 32020 cone onto the 100 mm shaft with force on the inner ring and the cup into the 150 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32020 tapered roller bearing?", "a": "A 32020 single-row metric tapered roller bearing per ISO 355 has a 100 mm bore, 150 mm outer diameter and 32 mm total assembly width (3.937 × 5.906 × 1.26 in), a 25.0 mm radial section and roughly 1603 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32020 bore code work?", "a": "The last two digits of 32020 are bore code 20, giving 20 × 5 = 100 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 150 mm OD and 32 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32020?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32020 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32020 set?", "a": "At fit-up the 100 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 100 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32020 take axial load in both directions?", "a": "A single 32020 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32021", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 160, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2044, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32021 encode the bore: code 21 = 105 mm (code × 5 from 04 upward). The ISO 355 envelope is 160 mm outside diameter and 35 mm total assembly width T over the separable cone and cup — 4.134 × 6.299 × 1.378 in, with a 27.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums" ], "failure_modes": [ "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path" ], "pitfalls": [ "The large 105 mm-bore 32021 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 105 mm shaft.", "The 320 narrow series at 105 mm bore keeps the OD down to 160 mm for space-limited hubs; its 35 mm width carries less load than a 30221, so do not substitute it into a 302 application without re-rating.", "The 35 mm-wide 32021 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 105 mm bore and 160 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 27.5 mm section.", "When mounting 32021 to a 105 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 160 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32021 cone and cup as a pair: pitting on the 160 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 105 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 32021 tapered roller bearing?", "a": "A 32021 single-row metric tapered roller bearing per ISO 355 has a 105 mm bore, 160 mm outer diameter and 35 mm total assembly width (4.134 × 6.299 × 1.378 in), a 27.5 mm radial section and roughly 2044 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32021 bore code work?", "a": "The last two digits of 32021 are bore code 21, giving 21 × 5 = 105 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 160 mm OD and 35 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32021?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32021 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32021 set?", "a": "At fit-up the 105 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 105 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32021 take axial load in both directions?", "a": "A single 32021 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32022", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 170, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2558, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32022 encode the bore: code 22 = 110 mm (code × 5 from 04 upward). The ISO 355 envelope is 170 mm outside diameter and 38 mm total assembly width T over the separable cone and cup — 4.331 × 6.693 × 1.496 in, with a 30.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "The large 110 mm-bore 32022 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 110 mm shaft.", "The 320 narrow series at 110 mm bore keeps the OD down to 170 mm for space-limited hubs; its 38 mm width carries less load than a 30222, so do not substitute it into a 302 application without re-rating.", "Before fitting 32022, machine the 110 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 38 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 30.0 mm radial section.", "The 32022 cup drives into the 170 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 38 mm load zone.", "Keep the 32022 pair matched through rebuilds; the 38 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 110 mm shaft alignment.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32022 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32022 tapered roller bearing?", "a": "A 32022 single-row metric tapered roller bearing per ISO 355 has a 110 mm bore, 170 mm outer diameter and 38 mm total assembly width (4.331 × 6.693 × 1.496 in), a 30.0 mm radial section and roughly 2558 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32022 bore code work?", "a": "The last two digits of 32022 are bore code 22, giving 22 × 5 = 110 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 170 mm OD and 38 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32022?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32022 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32022 set?", "a": "At fit-up the 110 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 110 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32022 take axial load in both directions?", "a": "A single 32022 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32024", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 120, "D_mm": 180, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 2741, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32024 encode the bore: code 24 = 120 mm (code × 5 from 04 upward). The ISO 355 envelope is 180 mm outside diameter and 38 mm total assembly width T over the separable cone and cup — 4.724 × 7.087 × 1.496 in, with a 30.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit" ], "pitfalls": [ "The large 120 mm-bore 32024 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 120 mm shaft.", "The 320 narrow series at 120 mm bore keeps the OD down to 180 mm for space-limited hubs; its 38 mm width carries less load than a 30224, so do not substitute it into a 302 application without re-rating.", "The 38 mm-wide 32024 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 120 mm bore and 180 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 30.0 mm section.", "When mounting 32024 to a 120 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 180 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32024 cone and cup as a pair: pitting on the 180 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 120 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "The cone and the cup of 32024 are separable: order and fit them as a matched set; never mix a cone from one manufacturer with another brand's cup — roller geometry and contact angle are not identical across brands.", "Set running clearance (or preload) with the shim pack or adjusting nut at fit-up; a 120 mm-bore 32024 that is too tight overheats and scores the rib, one too loose develops end play and noise — follow the torque-and-untighten procedure." ], "faq": [ { "q": "What are the dimensions of a 32024 tapered roller bearing?", "a": "A 32024 single-row metric tapered roller bearing per ISO 355 has a 120 mm bore, 180 mm outer diameter and 38 mm total assembly width (4.724 × 7.087 × 1.496 in), a 30.0 mm radial section and roughly 2741 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32024 bore code work?", "a": "The last two digits of 32024 are bore code 24, giving 24 × 5 = 120 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 180 mm OD and 38 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32024?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32024 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32024 set?", "a": "At fit-up the 120 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 120 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32024 take axial load in both directions?", "a": "A single 32024 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32026", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 130, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4166, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32026 encode the bore: code 26 = 130 mm (code × 5 from 04 upward). The ISO 355 envelope is 200 mm outside diameter and 45 mm total assembly width T over the separable cone and cup — 5.118 × 7.874 × 1.772 in, with a 35.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys" ], "failure_modes": [ "false brinelling from vibration while the axle is stationary during transport", "fretting corrosion on a loose shaft seat when the cone is pressed to an interference that relaxes with wear", "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload" ], "pitfalls": [ "The large 130 mm-bore 32026 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 130 mm shaft.", "The 320 narrow series at 130 mm bore keeps the OD down to 200 mm for space-limited hubs; its 45 mm width carries less load than a 30226, so do not substitute it into a 302 application without re-rating.", "Check the shoulder geometry for 32026: a generous fillet on the 130 mm shaft looks strong but stops the 45 mm ring seating home; use the catalogue corner-relief radius and provide a withdrawal groove so the 35.0 mm-section cup presses flush in the 200 mm housing.", "Never fit 32026 by tightening the adjuster to force the cone up the 130 mm taper — draw the nut to seat the rollers, then back it off; the 45 mm total width is set by the cup-cone stack, and pushing beyond it is the common cause of seized ribs.", "Relubrication for 32026 must reach the rib-roller end contact, not just the 130 mm bore; in a hub repack, work EP grease through the roller set until it exudes at both faces of the 45 mm-wide assembly or the sliding rib contact starves first.", "The sliding contact between roller large ends and the inner-ring rib needs extreme-pressure lubricant; use an EP gear oil or EP grease (GL-5 class in axles) rather than plain bearing grease or the rib will smear in the first heavy run.", "Tapered rollers accept virtually no misalignment; a deflected 130 mm shaft or a tilted housing shoulder concentrates load on one end of the 45 mm-wide roller row — align seats and verify housing perpendicularity." ], "faq": [ { "q": "What are the dimensions of a 32026 tapered roller bearing?", "a": "A 32026 single-row metric tapered roller bearing per ISO 355 has a 130 mm bore, 200 mm outer diameter and 45 mm total assembly width (5.118 × 7.874 × 1.772 in), a 35.0 mm radial section and roughly 4166 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32026 bore code work?", "a": "The last two digits of 32026 are bore code 26, giving 26 × 5 = 130 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 200 mm OD and 45 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32026?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32026 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32026 set?", "a": "At fit-up the 130 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 130 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32026 take axial load in both directions?", "a": "A single 32026 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32028", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 140, "D_mm": 210, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 4418, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32028 encode the bore: code 28 = 140 mm (code × 5 from 04 upward). The ISO 355 envelope is 210 mm outside diameter and 45 mm total assembly width T over the separable cone and cup — 5.512 × 8.268 × 1.772 in, with a 35.0 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "truck and trailer wheel hubs", "heavy final drives and differentials", "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes" ], "failure_modes": [ "cup creep and housing bore fretting when the outer ring is left without its specified press fit", "roller large-end smearing and scoring against the inner-ring guide rib from loss of the EP lubricant film", "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling" ], "pitfalls": [ "The large 140 mm-bore 32028 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 140 mm shaft.", "The 320 narrow series at 140 mm bore keeps the OD down to 210 mm for space-limited hubs; its 45 mm width carries less load than a 30228, so do not substitute it into a 302 application without re-rating.", "Before fitting 32028, machine the 140 mm shaft seat and 210 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 45 mm-wide cone and cup only load correctly when the full faces abut, and a large radius pinches the 35.0 mm radial section.", "The 32028 cup drives into the 210 mm housing bore with a sleeve against its outer face only; pressure on the inner ring or cage transfers through the rollers and leaves indentations that become spalls within the 45 mm load zone.", "Keep the 32028 pair matched through rebuilds; the 45 mm running geometry and contact pattern are adjusted between the two cups, so replacing one side with an unmarked row shifts the contact patch off-centre and ruins the 140 mm shaft alignment.", "Press the 32028 cone onto the 140 mm shaft with force on the inner ring and the cup into the 210 mm housing on the outer ring; driving through the rollers or transmitting mounting force across the assembly brinells the raceways.", "Do not swap a 32000 row for a ball bearing of the same bore: tapered rollers are heavier, slower (sliding rib contact caps the speed) and must be adjusted, but they outperform ball bearings on combined load and shock in gear and hub duty." ], "faq": [ { "q": "What are the dimensions of a 32028 tapered roller bearing?", "a": "A 32028 single-row metric tapered roller bearing per ISO 355 has a 140 mm bore, 210 mm outer diameter and 45 mm total assembly width (5.512 × 8.268 × 1.772 in), a 35.0 mm radial section and roughly 4418 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32028 bore code work?", "a": "The last two digits of 32028 are bore code 28, giving 28 × 5 = 140 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 210 mm OD and 45 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32028?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32028 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32028 set?", "a": "At fit-up the 140 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 140 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32028 take axial load in both directions?", "a": "A single 32028 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] }, { "sku": "32030", "brand": "GENERIC-ISO", "series": "32000-series", "type": "tapered_roller", "d_mm": 150, "D_mm": 225, "B_mm": 48, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "weight_g": 5410, "weight_estimated": true, "standard": "ISO 355", "naming_rule_text": "In the 32000-series the last two digits of 32030 encode the bore: code 30 = 150 mm (code × 5 from 04 upward). The ISO 355 envelope is 225 mm outside diameter and 48 mm total assembly width T over the separable cone and cup — 5.906 × 8.858 × 1.89 in, with a 37.5 mm radial section height. Tapered rollers carry combined radial and single-direction axial load; bidirectional thrust needs an opposed pair (X face-to-face or O back-to-back) adjusted at fit-up. With a rotating cone on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore, EP lubrication and a defined end-play setting — verify against the load direction and magnitude.", "applications": [ "large conveyor drum pulleys", "crane travel wheels and winch drums", "railway axle boxes", "agricultural tractor axles", "truck and trailer wheel hubs" ], "failure_modes": [ "raceway spalling at the roller-rib junction after the L10 life or sustained axial overload", "over-preload heat: a shim stack cut too thin drives contact stress up and seizes the cone on the seat", "under-preload end play that lets the rollers skid, producing noise and false brinelling", "water and grit pitting in unsealed hubs where the cup-cone joint acts as a debris entry path", "false brinelling from vibration while the axle is stationary during transport" ], "pitfalls": [ "The large 150 mm-bore 32030 develops substantial mounting forces; heat the cone (induction heater, max 120 °C) and never tighten the adjusting nut to seat it — draw it up by torque, then back off to the mark, leaving roughly 0.05–0.20 mm end play on the 150 mm shaft.", "The 320 narrow series at 150 mm bore keeps the OD down to 225 mm for space-limited hubs; its 48 mm width carries less load than a 30230, so do not substitute it into a 302 application without re-rating.", "The 48 mm-wide 32030 ring seats against a shaft and housing shoulder whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 150 mm bore and 225 mm cup seat square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 37.5 mm section.", "When mounting 32030 to a 150 mm shaft, warm the cone to 80–100 °C and slide it dry to the shoulder; cooling shrinks it into its interference, whereas hammering a cold cone through a 225 mm assembly dents the tapered raceway before first run.", "Inspect the removed 32030 cone and cup as a pair: pitting on the 225 mm cup with a clean cone usually means seal failure and water ingress, while rib scoring on the 150 mm cone points to wrong preload or lost EP film — the two faults need different corrections.", "Assign fits by which ring rotates: an interference shaft fit for a rotating cone; if the cup rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 32030 takes thrust in ONE direction — the rollers roll toward the rib under load, so reverse thrust unloads the contact. For a wheel or pinion use an opposing 320-series pair adjusted against each other." ], "faq": [ { "q": "What are the dimensions of a 32030 tapered roller bearing?", "a": "A 32030 single-row metric tapered roller bearing per ISO 355 has a 150 mm bore, 225 mm outer diameter and 48 mm total assembly width (5.906 × 8.858 × 1.89 in), a 37.5 mm radial section and roughly 5410 g geometry-based estimated mass; catalogue masses vary with roller and cage design." }, { "q": "How does the 32030 bore code work?", "a": "The last two digits of 32030 are bore code 30, giving 30 × 5 = 150 mm bore — the same convention as 6xx ball bearings, starting at code 04 (20 mm). The 225 mm OD and 48 mm width come from the ISO 355 diameter and width series, not the bore code alone." }, { "q": "What is the cone and cup of 32030?", "a": "Tapered roller bearings are separable: the cone is the inner ring with the tapered rollers and cage, the cup is the outer ring. 32030 denotes a matched cone-and-cup set. They are fitted separately — cone pressed on the shaft, cup in the housing — and adjusted against each other." }, { "q": "How is the preload or clearance of 32030 set?", "a": "At fit-up the 150 mm-bore cone is tightened against the cup while the hub is rotated, seated, then backed off to the specified end play — a typical starting range of 0.05–0.20 mm for a 150 mm bore — and locked with shims, a locknut or a spacer. Too tight overheats and seizes the rib; too loose causes skid, noise and early wear. Confirm the exact figure in the hub or axle-maker procedure." }, { "q": "Can 32030 take axial load in both directions?", "a": "A single 32030 takes thrust in one direction only — the roller large ends bear against the inner-ring rib under load. Bidirectional axial load requires an opposed pair: X (face-to-face) tolerates misalignment slightly better, O (back-to-back) gives a wider load centre and more moment stiffness." } ], "cross_ref": [ { "equiv_sku": "32030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data." } ], "source_ref": "https://www.iso.org/standard/42264.html", "catalog_ver": "iso355-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -30, "temp_max_c": 120, "clearance_options": [ "CN" ] } ]