[ { "sku": "7200", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 10, "D_mm": 30, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 29, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6200 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "miniature pump rotors", "servo drive shafts", "fans and blowers", "hand tool rotors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 10 mm bore is the default general-purpose angular-contact envelope (30×9 mm); the deep-groove counterpart 6200 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7200 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7200 angular-contact bearing?", "a": "A 7200 single-row angular-contact ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 29 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7200 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7200?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7200 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7200 compare with a deep-groove 6200?", "a": "Both share the 10×30×9 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7200 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6200." } ], "cross_ref": [ { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7201", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 12, "D_mm": 32, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 35, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6201 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo drive shafts", "fans and blowers", "hand tool rotors", "small precision gearboxes" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 12 mm bore is the default general-purpose angular-contact envelope (32×10 mm); the deep-groove counterpart 6201 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7201 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7201 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7201 angular-contact bearing?", "a": "A 7201 single-row angular-contact ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 35 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7201 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7201?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7201 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7201 compare with a deep-groove 6201?", "a": "Both share the 12×32×10 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7201 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6201." } ], "cross_ref": [ { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7202", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 15, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 44, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6202 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "fans and blowers", "hand tool rotors", "small precision gearboxes", "instrument spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 15 mm bore is the default general-purpose angular-contact envelope (35×11 mm); the deep-groove counterpart 6202 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7202 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7202 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7202 angular-contact bearing?", "a": "A 7202 single-row angular-contact ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 44 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7202 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7202?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7202 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7202 compare with a deep-groove 6202?", "a": "Both share the 15×35×11 mm ISO 15 envelope (10.0 mm radial section), but the angular-contact 7202 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6202." } ], "cross_ref": [ { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7203", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 17, "D_mm": 40, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 63, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6203 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "hand tool rotors", "small precision gearboxes", "instrument spindles", "miniature pump rotors" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 72xx light section at 17 mm bore is the default general-purpose angular-contact envelope (40×12 mm); the deep-groove counterpart 6203 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7203 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7203 where a deep-groove 6203 would do: same 17×40×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7203 angular-contact bearing?", "a": "A 7203 single-row angular-contact ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 63 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7203 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7203?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7203 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7203 compare with a deep-groove 6203?", "a": "Both share the 17×40×12 mm ISO 15 envelope (11.5 mm radial section), but the angular-contact 7203 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6203." } ], "cross_ref": [ { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7204", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 20, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 101, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6204 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 20 mm bore is the default general-purpose angular-contact envelope (47×14 mm); the deep-groove counterpart 6204 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7204 where a deep-groove 6204 would do: same 20×47×14 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7204 angular-contact bearing?", "a": "A 7204 single-row angular-contact ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 101 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7204 bore code work?", "a": "The last two digits of 7204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, shared with the 6204 deep-groove envelope." }, { "q": "What is the contact angle of 7204?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7204 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7204 compare with a deep-groove 6204?", "a": "Both share the 20×47×14 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7204 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6204." } ], "cross_ref": [ { "equiv_sku": "6204", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6204-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7205", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 25, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6205 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 25 mm bore is the default general-purpose angular-contact envelope (52×15 mm); the deep-groove counterpart 6205 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7205 angular-contact bearing?", "a": "A 7205 single-row angular-contact ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 125 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7205 bore code work?", "a": "The last two digits of 7205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6205 deep-groove envelope." }, { "q": "What is the contact angle of 7205?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7205 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7205 compare with a deep-groove 6205?", "a": "Both share the 25×52×15 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7205 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6205." } ], "cross_ref": [ { "equiv_sku": "6205", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6205-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7206", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 30, "D_mm": 62, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6206 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 30 mm bore is the default general-purpose angular-contact envelope (62×16 mm); the deep-groove counterpart 6206 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7206 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7206 angular-contact bearing?", "a": "A 7206 single-row angular-contact ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 189 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7206 bore code work?", "a": "The last two digits of 7206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6206 deep-groove envelope." }, { "q": "What is the contact angle of 7206?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7206 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7206 compare with a deep-groove 6206?", "a": "Both share the 30×62×16 mm ISO 15 envelope (16.0 mm radial section), but the angular-contact 7206 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6206." } ], "cross_ref": [ { "equiv_sku": "6206", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6206-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7207", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 35, "D_mm": 72, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 270, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6207 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 35 mm bore is the default general-purpose angular-contact envelope (72×17 mm); the deep-groove counterpart 6207 shares the envelope but is not a drop-in swap for combined-load duty.", "A single 7207 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7207 angular-contact bearing?", "a": "A 7207 single-row angular-contact ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 270 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7207 bore code work?", "a": "The last two digits of 7207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, shared with the 6207 deep-groove envelope." }, { "q": "What is the contact angle of 7207?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7207 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7207 compare with a deep-groove 6207?", "a": "Both share the 35×72×17 mm ISO 15 envelope (18.5 mm radial section), but the angular-contact 7207 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6207." } ], "cross_ref": [ { "equiv_sku": "6207-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6207-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7208", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 40, "D_mm": 80, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6208 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 40 mm bore is the default general-purpose angular-contact envelope (80×18 mm); the deep-groove counterpart 6208 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7208 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7208 angular-contact bearing?", "a": "A 7208 single-row angular-contact ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 346 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7208 bore code work?", "a": "The last two digits of 7208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6208 deep-groove envelope." }, { "q": "What is the contact angle of 7208?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7208 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7208 compare with a deep-groove 6208?", "a": "Both share the 40×80×18 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7208 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6208." } ], "cross_ref": [ { "equiv_sku": "6208", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6208-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7209", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 45, "D_mm": 85, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 396, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6209 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 72xx light section at 45 mm bore is the default general-purpose angular-contact envelope (85×19 mm); the deep-groove counterpart 6209 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7209 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7209 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7209 angular-contact bearing?", "a": "A 7209 single-row angular-contact ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 396 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7209 bore code work?", "a": "The last two digits of 7209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6209 deep-groove envelope." }, { "q": "What is the contact angle of 7209?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7209 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7209 compare with a deep-groove 6209?", "a": "Both share the 45×85×19 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7209 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6209." } ], "cross_ref": [ { "equiv_sku": "6209-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6209-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7210", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 50, "D_mm": 90, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 449, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6210 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 50 mm bore is the default general-purpose angular-contact envelope (90×20 mm); the deep-groove counterpart 6210 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7210 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7210 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7210 angular-contact bearing?", "a": "A 7210 single-row angular-contact ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 449 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7210 bore code work?", "a": "The last two digits of 7210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6210 deep-groove envelope." }, { "q": "What is the contact angle of 7210?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7210 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7210 compare with a deep-groove 6210?", "a": "Both share the 50×90×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7210 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6210." } ], "cross_ref": [ { "equiv_sku": "6210-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6210-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7211", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 55, "D_mm": 100, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 587, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6211 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 55 mm bore is the default general-purpose angular-contact envelope (100×21 mm); the deep-groove counterpart 6211 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7211 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7211 where a deep-groove 6211 would do: same 55×100×21 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7211 angular-contact bearing?", "a": "A 7211 single-row angular-contact ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 587 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7211 bore code work?", "a": "The last two digits of 7211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6211 deep-groove envelope." }, { "q": "What is the contact angle of 7211?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7211 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7211 compare with a deep-groove 6211?", "a": "Both share the 55×100×21 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7211 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6211." } ], "cross_ref": [ { "equiv_sku": "6211-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6211-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7212", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 60, "D_mm": 110, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 749, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6212 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 60 mm bore is the default general-purpose angular-contact envelope (110×22 mm); the deep-groove counterpart 6212 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7212 where a deep-groove 6212 would do: same 60×110×22 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7212 angular-contact bearing?", "a": "A 7212 single-row angular-contact ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 749 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7212 bore code work?", "a": "The last two digits of 7212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6212 deep-groove envelope." }, { "q": "What is the contact angle of 7212?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7212 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7212 compare with a deep-groove 6212?", "a": "Both share the 60×110×22 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7212 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6212." } ], "cross_ref": [ { "equiv_sku": "6212-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6212-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7213", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 65, "D_mm": 120, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 938, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6213 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 65 mm bore is the default general-purpose angular-contact envelope (120×23 mm); the deep-groove counterpart 6213 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7213 angular-contact bearing?", "a": "A 7213 single-row angular-contact ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 938 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7213 bore code work?", "a": "The last two digits of 7213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6213 deep-groove envelope." }, { "q": "What is the contact angle of 7213?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7213 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7213 compare with a deep-groove 6213?", "a": "Both share the 65×120×23 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7213 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6213." } ], "cross_ref": [ { "equiv_sku": "6213-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6213-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7214", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 70, "D_mm": 125, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1032, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6214 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 70 mm bore is the default general-purpose angular-contact envelope (125×24 mm); the deep-groove counterpart 6214 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7214 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7214 angular-contact bearing?", "a": "A 7214 single-row angular-contact ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1032 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7214 bore code work?", "a": "The last two digits of 7214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6214 deep-groove envelope." }, { "q": "What is the contact angle of 7214?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7214 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7214 compare with a deep-groove 6214?", "a": "Both share the 70×125×24 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7214 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6214." } ], "cross_ref": [ { "equiv_sku": "6214-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6214-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7215", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 75, "D_mm": 130, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1130, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6215 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 72xx light section at 75 mm bore is the default general-purpose angular-contact envelope (130×25 mm); the deep-groove counterpart 6215 shares the envelope but is not a drop-in swap for combined-load duty.", "A single 7215 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7215 angular-contact bearing?", "a": "A 7215 single-row angular-contact ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1130 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7215 bore code work?", "a": "The last two digits of 7215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6215 deep-groove envelope." }, { "q": "What is the contact angle of 7215?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7215 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7215 compare with a deep-groove 6215?", "a": "Both share the 75×130×25 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7215 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6215." } ], "cross_ref": [ { "equiv_sku": "6215-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6215-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7216", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 80, "D_mm": 140, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1375, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6216 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 80 mm bore is the default general-purpose angular-contact envelope (140×26 mm); the deep-groove counterpart 6216 shares the envelope but is not a drop-in swap for combined-load duty.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7216 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7216 angular-contact bearing?", "a": "A 7216 single-row angular-contact ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1375 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7216 bore code work?", "a": "The last two digits of 7216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, shared with the 6216 deep-groove envelope." }, { "q": "What is the contact angle of 7216?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7216 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7216 compare with a deep-groove 6216?", "a": "Both share the 80×140×26 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7216 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6216." } ], "cross_ref": [ { "equiv_sku": "6216-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6216-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7217", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 85, "D_mm": 150, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1714, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6217 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 85 mm bore is the default general-purpose angular-contact envelope (150×28 mm); the deep-groove counterpart 6217 shares the envelope but is not a drop-in swap for combined-load duty.", "Angular-contact 7217 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7217 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7217 angular-contact bearing?", "a": "A 7217 single-row angular-contact ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1714 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7217 bore code work?", "a": "The last two digits of 7217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, shared with the 6217 deep-groove envelope." }, { "q": "What is the contact angle of 7217?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7217 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7217 compare with a deep-groove 6217?", "a": "Both share the 85×150×28 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7217 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6217." } ], "cross_ref": [ { "equiv_sku": "6217-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6217-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7218", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 90, "D_mm": 160, "B_mm": 30, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2104, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6218 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 90 mm bore is the default general-purpose angular-contact envelope (160×30 mm); the deep-groove counterpart 6218 shares the envelope but is not a drop-in swap for combined-load duty.", "Preload class matters: a 7218 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7218 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7218 angular-contact bearing?", "a": "A 7218 single-row angular-contact ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2104 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7218 bore code work?", "a": "The last two digits of 7218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, shared with the 6218 deep-groove envelope." }, { "q": "What is the contact angle of 7218?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7218 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7218 compare with a deep-groove 6218?", "a": "Both share the 90×160×30 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7218 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6218." } ], "cross_ref": [ { "equiv_sku": "6218-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6218-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7219", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 95, "D_mm": 170, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2549, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6219 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 95 mm bore is the default general-purpose angular-contact envelope (170×32 mm); the deep-groove counterpart 6219 shares the envelope but is not a drop-in swap for combined-load duty.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7219 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7219 where a deep-groove 6219 would do: same 95×170×32 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7219 angular-contact bearing?", "a": "A 7219 single-row angular-contact ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2549 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7219 bore code work?", "a": "The last two digits of 7219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, shared with the 6219 deep-groove envelope." }, { "q": "What is the contact angle of 7219?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7219 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7219 compare with a deep-groove 6219?", "a": "Both share the 95×170×32 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7219 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6219." } ], "cross_ref": [ { "equiv_sku": "6219-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6219-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7220", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 100, "D_mm": 180, "B_mm": 34, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3052, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6220 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 100 mm bore is the default general-purpose angular-contact envelope (180×34 mm); the deep-groove counterpart 6220 shares the envelope but is not a drop-in swap for combined-load duty.", "Do not run a single 7220 where a deep-groove 6220 would do: same 100×180×34 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7220 angular-contact bearing?", "a": "A 7220 single-row angular-contact ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3052 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7220 bore code work?", "a": "The last two digits of 7220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, shared with the 6220 deep-groove envelope." }, { "q": "What is the contact angle of 7220?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7220 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7220 compare with a deep-groove 6220?", "a": "Both share the 100×180×34 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7220 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6220." } ], "cross_ref": [ { "equiv_sku": "6220-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6220-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7221", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 105, "D_mm": 190, "B_mm": 36, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3618, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6221 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 105 mm bore is the default general-purpose angular-contact envelope (190×36 mm); the deep-groove counterpart 6221 shares the envelope but is not a drop-in swap for combined-load duty.", "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7221 angular-contact bearing?", "a": "A 7221 single-row angular-contact ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3618 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7221 bore code work?", "a": "The last two digits of 7221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, shared with the 6221 deep-groove envelope." }, { "q": "What is the contact angle of 7221?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7221 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7221 compare with a deep-groove 6221?", "a": "Both share the 105×190×36 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7221 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6221." } ], "cross_ref": [ { "equiv_sku": "6221-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6221-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7222", "brand": "GENERIC-ISO", "series": "7200-series", "type": "angular_contact", "d_mm": 110, "D_mm": 200, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4249, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7200-series (ISO 15 diameter series 2) the last two digits encode the bore: 7222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6222 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 72xx light section at 110 mm bore is the default general-purpose angular-contact envelope (200×38 mm); the deep-groove counterpart 6222 shares the envelope but is not a drop-in swap for combined-load duty.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7222 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7222 angular-contact bearing?", "a": "A 7222 single-row angular-contact ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4249 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7222 bore code work?", "a": "The last two digits of 7222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, shared with the 6222 deep-groove envelope." }, { "q": "What is the contact angle of 7222?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7222 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7222 compare with a deep-groove 6222?", "a": "Both share the 110×200×38 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7222 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6222." } ], "cross_ref": [ { "equiv_sku": "6222-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6222-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7300", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 50, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6300 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "fans and blowers", "hand tool rotors", "small precision gearboxes", "instrument spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier balls also trade away speed versus a 7200 angular contact.", "Angular-contact 7300 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7300 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7300 angular-contact bearing?", "a": "A 7300 single-row angular-contact ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 50 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7300?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7300 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7300 compare with a deep-groove 6300?", "a": "Both share the 10×35×11 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7300 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6300." } ], "cross_ref": [ { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7301", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 12, "D_mm": 37, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 59, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6301 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "hand tool rotors", "small precision gearboxes", "instrument spindles", "miniature pump rotors" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier balls also trade away speed versus a 7201 angular contact.", "Preload class matters: a 7301 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7301 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7301 angular-contact bearing?", "a": "A 7301 single-row angular-contact ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 59 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7301 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7301?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7301 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7301 compare with a deep-groove 6301?", "a": "Both share the 12×37×12 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7301 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6301." } ], "cross_ref": [ { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7302", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 15, "D_mm": 42, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 80, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6302 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small precision gearboxes", "instrument spindles", "miniature pump rotors", "servo drive shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier balls also trade away speed versus a 7202 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7302 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7302 where a deep-groove 6302 would do: same 15×42×13 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7302 angular-contact bearing?", "a": "A 7302 single-row angular-contact ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 80 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7302 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7302?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7302 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7302 compare with a deep-groove 6302?", "a": "Both share the 15×42×13 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7302 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6302." } ], "cross_ref": [ { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7303", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 17, "D_mm": 47, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 108, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6303 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "instrument spindles", "miniature pump rotors", "servo drive shafts", "fans and blowers" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier balls also trade away speed versus a 7203 angular contact.", "Do not run a single 7303 where a deep-groove 6303 would do: same 17×47×14 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7303 angular-contact bearing?", "a": "A 7303 single-row angular-contact ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 108 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7303 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7303?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7303 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7303 compare with a deep-groove 6303?", "a": "Both share the 17×47×14 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7303 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6303." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7304", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 20, "D_mm": 52, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 138, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6304 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier balls also trade away speed versus a 7204 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7304 angular-contact bearing?", "a": "A 7304 single-row angular-contact ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 138 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7304 bore code work?", "a": "The last two digits of 7304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6304 deep-groove envelope." }, { "q": "What is the contact angle of 7304?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7304 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7304 compare with a deep-groove 6304?", "a": "Both share the 20×52×15 mm ISO 15 envelope (16.0 mm radial section), but the angular-contact 7304 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6304." } ], "cross_ref": [ { "equiv_sku": "6304", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6304-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7305", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 25, "D_mm": 62, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 219, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6305 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier balls also trade away speed versus a 7205 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7305 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7305 angular-contact bearing?", "a": "A 7305 single-row angular-contact ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 219 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7305 bore code work?", "a": "The last two digits of 7305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, shared with the 6305 deep-groove envelope." }, { "q": "What is the contact angle of 7305?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7305 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7305 compare with a deep-groove 6305?", "a": "Both share the 25×62×17 mm ISO 15 envelope (18.5 mm radial section), but the angular-contact 7305 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6305." } ], "cross_ref": [ { "equiv_sku": "6305", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6305-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7306", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 30, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 326, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6306 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 30 mm bore through a 72 mm OD and 19 mm width; the heavier balls also trade away speed versus a 7206 angular contact.", "A single 7306 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7306 angular-contact bearing?", "a": "A 7306 single-row angular-contact ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 326 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7306 bore code work?", "a": "The last two digits of 7306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6306 deep-groove envelope." }, { "q": "What is the contact angle of 7306?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7306 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7306 compare with a deep-groove 6306?", "a": "Both share the 30×72×19 mm ISO 15 envelope (21.0 mm radial section), but the angular-contact 7306 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6306." } ], "cross_ref": [ { "equiv_sku": "6306", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6306-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7307", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 35, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 436, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6307 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier balls also trade away speed versus a 7207 angular contact.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7307 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7307 angular-contact bearing?", "a": "A 7307 single-row angular-contact ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 436 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7307 bore code work?", "a": "The last two digits of 7307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6307 deep-groove envelope." }, { "q": "What is the contact angle of 7307?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7307 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7307 compare with a deep-groove 6307?", "a": "Both share the 35×80×21 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7307 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6307." } ], "cross_ref": [ { "equiv_sku": "6307-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6307-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7308", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 40, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 599, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6308 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier balls also trade away speed versus a 7208 angular contact.", "Angular-contact 7308 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7308 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7308 angular-contact bearing?", "a": "A 7308 single-row angular-contact ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 599 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7308 bore code work?", "a": "The last two digits of 7308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6308 deep-groove envelope." }, { "q": "What is the contact angle of 7308?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7308 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7308 compare with a deep-groove 6308?", "a": "Both share the 40×90×23 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7308 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6308." } ], "cross_ref": [ { "equiv_sku": "6308", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6308-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7309", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 45, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 799, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6309 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 73xx medium section gains axial and radial rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier balls also trade away speed versus a 7209 angular contact.", "Preload class matters: a 7309 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7309 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7309 angular-contact bearing?", "a": "A 7309 single-row angular-contact ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 799 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7309 bore code work?", "a": "The last two digits of 7309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6309 deep-groove envelope." }, { "q": "What is the contact angle of 7309?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7309 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7309 compare with a deep-groove 6309?", "a": "Both share the 45×100×25 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7309 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6309." } ], "cross_ref": [ { "equiv_sku": "6309-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6309-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7310", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 50, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1039, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6310 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier balls also trade away speed versus a 7210 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7310 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7310 where a deep-groove 6310 would do: same 50×110×27 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7310 angular-contact bearing?", "a": "A 7310 single-row angular-contact ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1039 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7310 bore code work?", "a": "The last two digits of 7310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, shared with the 6310 deep-groove envelope." }, { "q": "What is the contact angle of 7310?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7310 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7310 compare with a deep-groove 6310?", "a": "Both share the 50×110×27 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7310 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6310." } ], "cross_ref": [ { "equiv_sku": "6310-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6310-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7311", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 55, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1322, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6311 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier balls also trade away speed versus a 7211 angular contact.", "Do not run a single 7311 where a deep-groove 6311 would do: same 55×120×29 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7311 angular-contact bearing?", "a": "A 7311 single-row angular-contact ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1322 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7311 bore code work?", "a": "The last two digits of 7311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, shared with the 6311 deep-groove envelope." }, { "q": "What is the contact angle of 7311?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7311 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7311 compare with a deep-groove 6311?", "a": "Both share the 55×120×29 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7311 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6311." } ], "cross_ref": [ { "equiv_sku": "6311-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6311-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7312", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 60, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1652, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6312 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier balls also trade away speed versus a 7212 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7312 angular-contact bearing?", "a": "A 7312 single-row angular-contact ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1652 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7312 bore code work?", "a": "The last two digits of 7312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, shared with the 6312 deep-groove envelope." }, { "q": "What is the contact angle of 7312?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7312 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7312 compare with a deep-groove 6312?", "a": "Both share the 60×130×31 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7312 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6312." } ], "cross_ref": [ { "equiv_sku": "6312-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6312-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7313", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 65, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2033, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6313 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier balls also trade away speed versus a 7213 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7313 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7313 angular-contact bearing?", "a": "A 7313 single-row angular-contact ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2033 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7313 bore code work?", "a": "The last two digits of 7313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, shared with the 6313 deep-groove envelope." }, { "q": "What is the contact angle of 7313?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7313 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7313 compare with a deep-groove 6313?", "a": "Both share the 65×140×33 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7313 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6313." } ], "cross_ref": [ { "equiv_sku": "6313-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6313-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7314", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 70, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2469, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6314 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier balls also trade away speed versus a 7214 angular contact.", "A single 7314 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7314 angular-contact bearing?", "a": "A 7314 single-row angular-contact ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2469 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7314 bore code work?", "a": "The last two digits of 7314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, shared with the 6314 deep-groove envelope." }, { "q": "What is the contact angle of 7314?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7314 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7314 compare with a deep-groove 6314?", "a": "Both share the 70×150×35 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7314 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6314." } ], "cross_ref": [ { "equiv_sku": "6314-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6314-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7315", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 75, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2962, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6315 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 73xx medium section gains axial and radial rating at 75 mm bore through a 160 mm OD and 37 mm width; the heavier balls also trade away speed versus a 7215 angular contact.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7315 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7315 angular-contact bearing?", "a": "A 7315 single-row angular-contact ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2962 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7315 bore code work?", "a": "The last two digits of 7315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, shared with the 6315 deep-groove envelope." }, { "q": "What is the contact angle of 7315?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7315 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7315 compare with a deep-groove 6315?", "a": "Both share the 75×160×37 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7315 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6315." } ], "cross_ref": [ { "equiv_sku": "6315-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6315-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7316", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 80, "D_mm": 170, "B_mm": 39, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3517, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6316 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier balls also trade away speed versus a 7216 angular contact.", "Angular-contact 7316 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7316 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7316 angular-contact bearing?", "a": "A 7316 single-row angular-contact ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3517 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7316 bore code work?", "a": "The last two digits of 7316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, shared with the 6316 deep-groove envelope." }, { "q": "What is the contact angle of 7316?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7316 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7316 compare with a deep-groove 6316?", "a": "Both share the 80×170×39 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7316 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6316." } ], "cross_ref": [ { "equiv_sku": "6316-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6316-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7317", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 85, "D_mm": 180, "B_mm": 41, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6317 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier balls also trade away speed versus a 7217 angular contact.", "Preload class matters: a 7317 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7317 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7317 angular-contact bearing?", "a": "A 7317 single-row angular-contact ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7317 bore code work?", "a": "The last two digits of 7317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, shared with the 6317 deep-groove envelope." }, { "q": "What is the contact angle of 7317?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7317 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7317 compare with a deep-groove 6317?", "a": "Both share the 85×180×41 mm ISO 15 envelope (47.5 mm radial section), but the angular-contact 7317 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6317." } ], "cross_ref": [ { "equiv_sku": "6317-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6317-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7318", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 90, "D_mm": 190, "B_mm": 43, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4825, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6318 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier balls also trade away speed versus a 7218 angular contact.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7318 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7318 where a deep-groove 6318 would do: same 90×190×43 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7318 angular-contact bearing?", "a": "A 7318 single-row angular-contact ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4825 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7318 bore code work?", "a": "The last two digits of 7318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, shared with the 6318 deep-groove envelope." }, { "q": "What is the contact angle of 7318?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7318 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7318 compare with a deep-groove 6318?", "a": "Both share the 90×190×43 mm ISO 15 envelope (50.0 mm radial section), but the angular-contact 7318 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6318." } ], "cross_ref": [ { "equiv_sku": "6318-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6318-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7319", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 95, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 5586, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6319 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier balls also trade away speed versus a 7219 angular contact.", "Do not run a single 7319 where a deep-groove 6319 would do: same 95×200×45 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7319 angular-contact bearing?", "a": "A 7319 single-row angular-contact ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 5586 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7319 bore code work?", "a": "The last two digits of 7319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, shared with the 6319 deep-groove envelope." }, { "q": "What is the contact angle of 7319?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7319 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7319 compare with a deep-groove 6319?", "a": "Both share the 95×200×45 mm ISO 15 envelope (52.5 mm radial section), but the angular-contact 7319 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6319." } ], "cross_ref": [ { "equiv_sku": "6319-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6319-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7320", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 100, "D_mm": 215, "B_mm": 47, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 6823, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6320 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier balls also trade away speed versus a 7220 angular contact.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7320 angular-contact bearing?", "a": "A 7320 single-row angular-contact ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 6823 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7320 bore code work?", "a": "The last two digits of 7320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, shared with the 6320 deep-groove envelope." }, { "q": "What is the contact angle of 7320?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7320 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7320 compare with a deep-groove 6320?", "a": "Both share the 100×215×47 mm ISO 15 envelope (57.5 mm radial section), but the angular-contact 7320 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6320." } ], "cross_ref": [ { "equiv_sku": "6320", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6320-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7321", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 105, "D_mm": 225, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 7776, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6321 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier balls also trade away speed versus a 7221 angular contact.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7321 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7321 angular-contact bearing?", "a": "A 7321 single-row angular-contact ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 7776 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7321 bore code work?", "a": "The last two digits of 7321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, shared with the 6321 deep-groove envelope." }, { "q": "What is the contact angle of 7321?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7321 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7321 compare with a deep-groove 6321?", "a": "Both share the 105×225×49 mm ISO 15 envelope (60.0 mm radial section), but the angular-contact 7321 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6321." } ], "cross_ref": [ { "equiv_sku": "6321-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6321", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6321-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7322", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 110, "D_mm": 240, "B_mm": 50, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 9117, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6322 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 73xx medium section gains axial and radial rating at 110 mm bore through a 240 mm OD and 50 mm width; the heavier balls also trade away speed versus a 7222 angular contact.", "A single 7322 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7322 angular-contact bearing?", "a": "A 7322 single-row angular-contact ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 9117 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7322 bore code work?", "a": "The last two digits of 7322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, shared with the 6322 deep-groove envelope." }, { "q": "What is the contact angle of 7322?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7322 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7322 compare with a deep-groove 6322?", "a": "Both share the 110×240×50 mm ISO 15 envelope (65.0 mm radial section), but the angular-contact 7322 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6322." } ], "cross_ref": [ { "equiv_sku": "6322-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6322", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7000", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 10, "D_mm": 26, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6000 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small precision gearboxes", "instrument spindles", "miniature pump rotors", "servo drive shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 10 mm bore uses a 26 mm OD; axial capacity is lower than a 7200, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7000 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7000 angular-contact bearing?", "a": "A 7000 single-row angular-contact ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7000?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7000 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7000 compare with a deep-groove 6000?", "a": "Both share the 10×26×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7000 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6000." } ], "cross_ref": [ { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7001", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 12, "D_mm": 28, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6001 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "instrument spindles", "miniature pump rotors", "servo drive shafts", "fans and blowers" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 12 mm bore uses a 28 mm OD; axial capacity is lower than a 7201, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7001 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7001 angular-contact bearing?", "a": "A 7001 single-row angular-contact ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7001?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7001 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7001 compare with a deep-groove 6001?", "a": "Both share the 12×28×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7001 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6001." } ], "cross_ref": [ { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7002", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 15, "D_mm": 32, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 29, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6002 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "miniature pump rotors", "servo drive shafts", "fans and blowers", "hand tool rotors" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 15 mm bore uses a 32 mm OD; axial capacity is lower than a 7202, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7002 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7002 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7002 angular-contact bearing?", "a": "A 7002 single-row angular-contact ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 29 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7002?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7002 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7002 compare with a deep-groove 6002?", "a": "Both share the 15×32×9 mm ISO 15 envelope (8.5 mm radial section), but the angular-contact 7002 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6002." } ], "cross_ref": [ { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7003", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 17, "D_mm": 35, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6003 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo drive shafts", "fans and blowers", "hand tool rotors", "small precision gearboxes" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 17 mm bore uses a 35 mm OD; axial capacity is lower than a 7203, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7003 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7003 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7003 angular-contact bearing?", "a": "A 7003 single-row angular-contact ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7003?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7003 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7003 compare with a deep-groove 6003?", "a": "Both share the 17×35×10 mm ISO 15 envelope (9.0 mm radial section), but the angular-contact 7003 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6003." } ], "cross_ref": [ { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7004", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 66, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6004 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 20 mm bore uses a 42 mm OD; axial capacity is lower than a 7204, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7004 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7004 where a deep-groove 6004 would do: same 20×42×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7004 angular-contact bearing?", "a": "A 7004 single-row angular-contact ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 66 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7004 bore code work?", "a": "The last two digits of 7004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6004 deep-groove envelope." }, { "q": "What is the contact angle of 7004?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7004 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7004 compare with a deep-groove 6004?", "a": "Both share the 20×42×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7004 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6004." } ], "cross_ref": [ { "equiv_sku": "6004", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6004-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7005", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 76, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6005 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 25 mm bore uses a 47 mm OD; axial capacity is lower than a 7205, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7005 where a deep-groove 6005 would do: same 25×47×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7005 angular-contact bearing?", "a": "A 7005 single-row angular-contact ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 76 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7005 bore code work?", "a": "The last two digits of 7005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6005 deep-groove envelope." }, { "q": "What is the contact angle of 7005?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7005 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7005 compare with a deep-groove 6005?", "a": "Both share the 25×47×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7005 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6005." } ], "cross_ref": [ { "equiv_sku": "6005", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6005-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7006", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 111, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6006 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 30 mm bore uses a 55 mm OD; axial capacity is lower than a 7206, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7006 angular-contact bearing?", "a": "A 7006 single-row angular-contact ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 111 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7006 bore code work?", "a": "The last two digits of 7006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 6006 deep-groove envelope." }, { "q": "What is the contact angle of 7006?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7006 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7006 compare with a deep-groove 6006?", "a": "Both share the 30×55×13 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7006 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6006." } ], "cross_ref": [ { "equiv_sku": "6006", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6006-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7007", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 147, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6007 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 35 mm bore uses a 62 mm OD; axial capacity is lower than a 7207, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7007 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7007 angular-contact bearing?", "a": "A 7007 single-row angular-contact ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 147 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7007 bore code work?", "a": "The last two digits of 7007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, shared with the 6007 deep-groove envelope." }, { "q": "What is the contact angle of 7007?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7007 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7007 compare with a deep-groove 6007?", "a": "Both share the 35×62×14 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7007 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6007." } ], "cross_ref": [ { "equiv_sku": "6007", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6007-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7008", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 182, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6008 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 40 mm bore uses a 68 mm OD; axial capacity is lower than a 7208, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7008 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7008 angular-contact bearing?", "a": "A 7008 single-row angular-contact ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 182 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7008 bore code work?", "a": "The last two digits of 7008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6008 deep-groove envelope." }, { "q": "What is the contact angle of 7008?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7008 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7008 compare with a deep-groove 6008?", "a": "Both share the 40×68×15 mm ISO 15 envelope (14.0 mm radial section), but the angular-contact 7008 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6008." } ], "cross_ref": [ { "equiv_sku": "6008", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6008-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7009", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 231, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6009 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 45 mm bore uses a 75 mm OD; axial capacity is lower than a 7209, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7009 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7009 angular-contact bearing?", "a": "A 7009 single-row angular-contact ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 231 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7009 bore code work?", "a": "The last two digits of 7009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6009 deep-groove envelope." }, { "q": "What is the contact angle of 7009?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7009 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7009 compare with a deep-groove 6009?", "a": "Both share the 45×75×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7009 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6009." } ], "cross_ref": [ { "equiv_sku": "6009-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6009-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7010", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 250, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6010 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 50 mm bore uses a 80 mm OD; axial capacity is lower than a 7210, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7010 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7010 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7010 angular-contact bearing?", "a": "A 7010 single-row angular-contact ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 250 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7010 bore code work?", "a": "The last two digits of 7010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6010 deep-groove envelope." }, { "q": "What is the contact angle of 7010?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7010 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7010 compare with a deep-groove 6010?", "a": "Both share the 50×80×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7010 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6010." } ], "cross_ref": [ { "equiv_sku": "6010", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6010-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7011", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 366, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6011 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 55 mm bore uses a 90 mm OD; axial capacity is lower than a 7211, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7011 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7011 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7011 angular-contact bearing?", "a": "A 7011 single-row angular-contact ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 366 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7011 bore code work?", "a": "The last two digits of 7011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6011 deep-groove envelope." }, { "q": "What is the contact angle of 7011?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7011 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7011 compare with a deep-groove 6011?", "a": "Both share the 55×90×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7011 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6011." } ], "cross_ref": [ { "equiv_sku": "6011-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6011-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7012", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 391, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6012 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 60 mm bore uses a 95 mm OD; axial capacity is lower than a 7212, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7012 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7012 where a deep-groove 6012 would do: same 60×95×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7012 angular-contact bearing?", "a": "A 7012 single-row angular-contact ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 391 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7012 bore code work?", "a": "The last two digits of 7012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6012 deep-groove envelope." }, { "q": "What is the contact angle of 7012?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7012 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7012 compare with a deep-groove 6012?", "a": "Both share the 60×95×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7012 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6012." } ], "cross_ref": [ { "equiv_sku": "6012", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6012-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7013", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 417, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6013 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 65 mm bore uses a 100 mm OD; axial capacity is lower than a 7213, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7013 where a deep-groove 6013 would do: same 65×100×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7013 angular-contact bearing?", "a": "A 7013 single-row angular-contact ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 417 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7013 bore code work?", "a": "The last two digits of 7013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6013 deep-groove envelope." }, { "q": "What is the contact angle of 7013?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7013 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7013 compare with a deep-groove 6013?", "a": "Both share the 65×100×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7013 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6013." } ], "cross_ref": [ { "equiv_sku": "6013-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6013-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7014", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 577, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6014 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 70 mm bore uses a 110 mm OD; axial capacity is lower than a 7214, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7014 angular-contact bearing?", "a": "A 7014 single-row angular-contact ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 577 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7014 bore code work?", "a": "The last two digits of 7014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6014 deep-groove envelope." }, { "q": "What is the contact angle of 7014?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7014 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7014 compare with a deep-groove 6014?", "a": "Both share the 70×110×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7014 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6014." } ], "cross_ref": [ { "equiv_sku": "6014-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6014-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7015", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 609, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6015 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 75 mm bore uses a 115 mm OD; axial capacity is lower than a 7215, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7015 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7015 angular-contact bearing?", "a": "A 7015 single-row angular-contact ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 609 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7015 bore code work?", "a": "The last two digits of 7015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6015 deep-groove envelope." }, { "q": "What is the contact angle of 7015?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7015 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7015 compare with a deep-groove 6015?", "a": "Both share the 75×115×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7015 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6015." } ], "cross_ref": [ { "equiv_sku": "6015", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6015-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7016", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 813, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6016 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 80 mm bore uses a 125 mm OD; axial capacity is lower than a 7216, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7016 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7016 angular-contact bearing?", "a": "A 7016 single-row angular-contact ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 813 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7016 bore code work?", "a": "The last two digits of 7016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6016 deep-groove envelope." }, { "q": "What is the contact angle of 7016?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7016 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7016 compare with a deep-groove 6016?", "a": "Both share the 80×125×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7016 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6016." } ], "cross_ref": [ { "equiv_sku": "6016-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6016-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7017", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 853, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6017 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 85 mm bore uses a 130 mm OD; axial capacity is lower than a 7217, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7017 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7017 angular-contact bearing?", "a": "A 7017 single-row angular-contact ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 853 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7017 bore code work?", "a": "The last two digits of 7017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6017 deep-groove envelope." }, { "q": "What is the contact angle of 7017?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7017 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7017 compare with a deep-groove 6017?", "a": "Both share the 85×130×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7017 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6017." } ], "cross_ref": [ { "equiv_sku": "6017-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6017-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7018", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1106, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6018 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 90 mm bore uses a 140 mm OD; axial capacity is lower than a 7218, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7018 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7018 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7018 angular-contact bearing?", "a": "A 7018 single-row angular-contact ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1106 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7018 bore code work?", "a": "The last two digits of 7018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6018 deep-groove envelope." }, { "q": "What is the contact angle of 7018?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7018 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7018 compare with a deep-groove 6018?", "a": "Both share the 90×140×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7018 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6018." } ], "cross_ref": [ { "equiv_sku": "6018-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6018-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7019", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1154, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6019 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 95 mm bore uses a 145 mm OD; axial capacity is lower than a 7219, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7019 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7019 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7019 angular-contact bearing?", "a": "A 7019 single-row angular-contact ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1154 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7019 bore code work?", "a": "The last two digits of 7019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6019 deep-groove envelope." }, { "q": "What is the contact angle of 7019?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7019 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7019 compare with a deep-groove 6019?", "a": "Both share the 95×145×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7019 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6019." } ], "cross_ref": [ { "equiv_sku": "6019-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6019-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7020", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6020 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 100 mm bore uses a 150 mm OD; axial capacity is lower than a 7220, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7020 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7020 where a deep-groove 6020 would do: same 100×150×24 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7020 angular-contact bearing?", "a": "A 7020 single-row angular-contact ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7020 bore code work?", "a": "The last two digits of 7020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6020 deep-groove envelope." }, { "q": "What is the contact angle of 7020?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7020 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7020 compare with a deep-groove 6020?", "a": "Both share the 100×150×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7020 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6020." } ], "cross_ref": [ { "equiv_sku": "6020-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6020-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7021", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 105, "D_mm": 160, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1519, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6021 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 105 mm bore uses a 160 mm OD; axial capacity is lower than a 7221, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7021 where a deep-groove 6021 would do: same 105×160×26 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7021 angular-contact bearing?", "a": "A 7021 single-row angular-contact ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1519 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7021 bore code work?", "a": "The last two digits of 7021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, shared with the 6021 deep-groove envelope." }, { "q": "What is the contact angle of 7021?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7021 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7021 compare with a deep-groove 6021?", "a": "Both share the 105×160×26 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7021 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6021." } ], "cross_ref": [ { "equiv_sku": "6021-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6021-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7022", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 110, "D_mm": 170, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1885, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6022 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 110 mm bore uses a 170 mm OD; axial capacity is lower than a 7222, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7022 angular-contact bearing?", "a": "A 7022 single-row angular-contact ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1885 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7022 bore code work?", "a": "The last two digits of 7022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, shared with the 6022 deep-groove envelope." }, { "q": "What is the contact angle of 7022?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7022 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7022 compare with a deep-groove 6022?", "a": "Both share the 110×170×28 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7022 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6022." } ], "cross_ref": [ { "equiv_sku": "6022-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "6022-ZZ", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7404", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 364, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6404 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 20 mm bore (72 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7404 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7404 angular-contact bearing?", "a": "A 7404 single-row angular-contact ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 364 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7404 bore code work?", "a": "The last two digits of 7404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6404 deep-groove envelope." }, { "q": "What is the contact angle of 7404?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7404 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7404 compare with a deep-groove 6404?", "a": "Both share the 20×72×19 mm ISO 15 envelope (26.0 mm radial section), but the angular-contact 7404 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6404." } ], "cross_ref": [ { "equiv_sku": "6404", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7405", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 486, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6405 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 25 mm bore (80 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7405 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7405 angular-contact bearing?", "a": "A 7405 single-row angular-contact ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 486 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7405 bore code work?", "a": "The last two digits of 7405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6405 deep-groove envelope." }, { "q": "What is the contact angle of 7405?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7405 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7405 compare with a deep-groove 6405?", "a": "Both share the 25×80×21 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7405 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6405." } ], "cross_ref": [ { "equiv_sku": "6405", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7406", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 664, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6406 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 30 mm bore (90 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7406 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7406 angular-contact bearing?", "a": "A 7406 single-row angular-contact ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 664 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7406 bore code work?", "a": "The last two digits of 7406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6406 deep-groove envelope." }, { "q": "What is the contact angle of 7406?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7406 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7406 compare with a deep-groove 6406?", "a": "Both share the 30×90×23 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7406 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6406." } ], "cross_ref": [ { "equiv_sku": "6406", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7407", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 879, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6407 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 35 mm bore (100 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Angular-contact 7407 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7407 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7407 angular-contact bearing?", "a": "A 7407 single-row angular-contact ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 879 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7407 bore code work?", "a": "The last two digits of 7407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6407 deep-groove envelope." }, { "q": "What is the contact angle of 7407?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7407 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7407 compare with a deep-groove 6407?", "a": "Both share the 35×100×25 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7407 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6407." } ], "cross_ref": [ { "equiv_sku": "6407", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7408", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6408 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 40 mm bore (110 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Preload class matters: a 7408 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7408 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7408 angular-contact bearing?", "a": "A 7408 single-row angular-contact ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7408 bore code work?", "a": "The last two digits of 7408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, shared with the 6408 deep-groove envelope." }, { "q": "What is the contact angle of 7408?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7408 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7408 compare with a deep-groove 6408?", "a": "Both share the 40×110×27 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7408 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6408." } ], "cross_ref": [ { "equiv_sku": "6408", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7409", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1438, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6409 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 45 mm bore (120 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7409 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7409 where a deep-groove 6409 would do: same 45×120×29 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7409 angular-contact bearing?", "a": "A 7409 single-row angular-contact ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1438 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7409 bore code work?", "a": "The last two digits of 7409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, shared with the 6409 deep-groove envelope." }, { "q": "What is the contact angle of 7409?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7409 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7409 compare with a deep-groove 6409?", "a": "Both share the 45×120×29 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7409 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6409." } ], "cross_ref": [ { "equiv_sku": "6409", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7410", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1789, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6410 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 50 mm bore (130 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Do not run a single 7410 where a deep-groove 6410 would do: same 50×130×31 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7410 angular-contact bearing?", "a": "A 7410 single-row angular-contact ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1789 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7410 bore code work?", "a": "The last two digits of 7410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, shared with the 6410 deep-groove envelope." }, { "q": "What is the contact angle of 7410?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7410 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7410 compare with a deep-groove 6410?", "a": "Both share the 50×130×31 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7410 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6410." } ], "cross_ref": [ { "equiv_sku": "6410", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7411", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2192, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6411 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 55 mm bore (140 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7411 angular-contact bearing?", "a": "A 7411 single-row angular-contact ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2192 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7411 bore code work?", "a": "The last two digits of 7411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, shared with the 6411 deep-groove envelope." }, { "q": "What is the contact angle of 7411?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7411 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7411 compare with a deep-groove 6411?", "a": "Both share the 55×140×33 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7411 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6411." } ], "cross_ref": [ { "equiv_sku": "6411", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7412", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2651, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6412 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 60 mm bore (150 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7412 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7412 angular-contact bearing?", "a": "A 7412 single-row angular-contact ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2651 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7412 bore code work?", "a": "The last two digits of 7412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, shared with the 6412 deep-groove envelope." }, { "q": "What is the contact angle of 7412?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7412 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7412 compare with a deep-groove 6412?", "a": "Both share the 60×150×35 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7412 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6412." } ], "cross_ref": [ { "equiv_sku": "6412", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7413", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6413 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 65 mm bore (160 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7413 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7413 angular-contact bearing?", "a": "A 7413 single-row angular-contact ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3169 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7413 bore code work?", "a": "The last two digits of 7413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, shared with the 6413 deep-groove envelope." }, { "q": "What is the contact angle of 7413?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7413 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7413 compare with a deep-groove 6413?", "a": "Both share the 65×160×37 mm ISO 15 envelope (47.5 mm radial section), but the angular-contact 7413 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6413." } ], "cross_ref": [ { "equiv_sku": "6413", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7414", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6414 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 70 mm bore (180 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7414 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7414 angular-contact bearing?", "a": "A 7414 single-row angular-contact ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4629 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7414 bore code work?", "a": "The last two digits of 7414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, shared with the 6414 deep-groove envelope." }, { "q": "What is the contact angle of 7414?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7414 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7414 compare with a deep-groove 6414?", "a": "Both share the 70×180×42 mm ISO 15 envelope (55.0 mm radial section), but the angular-contact 7414 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6414." } ], "cross_ref": [ { "equiv_sku": "6414", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71804", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61804 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7204.", "With a 6.0 mm radial section on a 20 mm bore, the 71804 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 32 mm housing.", "A single 71804 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71804 angular-contact bearing?", "a": "A 71804 single-row angular-contact ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71804 bore code work?", "a": "The last two digits of 71804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61804 deep-groove envelope." }, { "q": "What is the contact angle of 71804?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71804 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71804?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61804-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61804-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71805", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 25, "D_mm": 37, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61805 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7205.", "Draw-up on a thin-section 71805 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71805 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71805 angular-contact bearing?", "a": "A 71805 single-row angular-contact ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71805 bore code work?", "a": "The last two digits of 71805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61805 deep-groove envelope." }, { "q": "What is the contact angle of 71805?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71805 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71805 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61805-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61805-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71806", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 30, "D_mm": 42, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 24, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61806 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7206.", "The 42 mm outer ring of 71806 is only 6.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Angular-contact 71806 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71806 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71806 angular-contact bearing?", "a": "A 71806 single-row angular-contact ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 24 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71806 bore code work?", "a": "The last two digits of 71806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61806 deep-groove envelope." }, { "q": "What is the contact angle of 71806?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71806 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71806 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71806 envelope is 30×42×7 mm with a 6.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61806-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61806-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71807", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 35, "D_mm": 47, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 28, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61807 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7207.", "Pair thin-section 71807 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 6.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Preload class matters: a 71807 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71807 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71807 angular-contact bearing?", "a": "A 71807 single-row angular-contact ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 28 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71807 bore code work?", "a": "The last two digits of 71807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61807 deep-groove envelope." }, { "q": "What is the contact angle of 71807?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71807 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71807?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61807-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61807-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71808", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 40, "D_mm": 52, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 31, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61808 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7208.", "With a 6.0 mm radial section on a 40 mm bore, the 71808 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 52 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71808 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71808 where a deep-groove 61808 would do: same 40×52×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71808 angular-contact bearing?", "a": "A 71808 single-row angular-contact ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 31 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71808 bore code work?", "a": "The last two digits of 71808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61808 deep-groove envelope." }, { "q": "What is the contact angle of 71808?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71808 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71808 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61808-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61808-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71809", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 45, "D_mm": 58, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61809 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7209.", "Draw-up on a thin-section 71809 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71809 where a deep-groove 61809 would do: same 45×58×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71809 angular-contact bearing?", "a": "A 71809 single-row angular-contact ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71809 bore code work?", "a": "The last two digits of 71809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61809 deep-groove envelope." }, { "q": "What is the contact angle of 71809?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71809 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71809 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71809 envelope is 45×58×7 mm with a 6.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61809-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61809-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71810", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 50, "D_mm": 65, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 48, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61810 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7210.", "The 65 mm outer ring of 71810 is only 7.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71810 angular-contact bearing?", "a": "A 71810 single-row angular-contact ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 48 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71810 bore code work?", "a": "The last two digits of 71810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61810 deep-groove envelope." }, { "q": "What is the contact angle of 71810?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71810 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71810?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 7.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61810-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61810-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71811", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 55, "D_mm": 72, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 78, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61811 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7211.", "Pair thin-section 71811 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 8.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71811 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71811 angular-contact bearing?", "a": "A 71811 single-row angular-contact ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 78 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71811 bore code work?", "a": "The last two digits of 71811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61811 deep-groove envelope." }, { "q": "What is the contact angle of 71811?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71811 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71811 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61811-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61811-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71812", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 60, "D_mm": 78, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 100, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61812 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7212.", "With a 9.0 mm radial section on a 60 mm bore, the 71812 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 78 mm housing.", "A single 71812 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71812 angular-contact bearing?", "a": "A 71812 single-row angular-contact ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 100 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71812 bore code work?", "a": "The last two digits of 71812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61812 deep-groove envelope." }, { "q": "What is the contact angle of 71812?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71812 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71812 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71812 envelope is 60×78×10 mm with a 9.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61812-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61812-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71813", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 65, "D_mm": 85, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 120, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61813 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7213.", "Draw-up on a thin-section 71813 is lighter than on a 72/73 bearing of the same bore: a 10 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71813 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71813 angular-contact bearing?", "a": "A 71813 single-row angular-contact ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 120 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71813 bore code work?", "a": "The last two digits of 71813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61813 deep-groove envelope." }, { "q": "What is the contact angle of 71813?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71813 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71813?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61813-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61813-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71814", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 70, "D_mm": 90, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 128, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61814 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7214.", "The 90 mm outer ring of 71814 is only 10.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 10 mm-wide raceway long before the load rating is reached.", "Angular-contact 71814 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71814 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71814 angular-contact bearing?", "a": "A 71814 single-row angular-contact ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 128 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71814 bore code work?", "a": "The last two digits of 71814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61814 deep-groove envelope." }, { "q": "What is the contact angle of 71814?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71814 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71814 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 10.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61814-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61814-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71815", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 75, "D_mm": 95, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61815 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7215.", "Pair thin-section 71815 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Preload class matters: a 71815 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71815 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71815 angular-contact bearing?", "a": "A 71815 single-row angular-contact ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71815 bore code work?", "a": "The last two digits of 71815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61815 deep-groove envelope." }, { "q": "What is the contact angle of 71815?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71815 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71815 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71815 envelope is 75×95×10 mm with a 10.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61815-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61815-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71816", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 80, "D_mm": 100, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 144, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61816 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7216.", "With a 10.0 mm radial section on a 80 mm bore, the 71816 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 100 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71816 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71816 where a deep-groove 61816 would do: same 80×100×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71816 angular-contact bearing?", "a": "A 71816 single-row angular-contact ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 144 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71816 bore code work?", "a": "The last two digits of 71816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61816 deep-groove envelope." }, { "q": "What is the contact angle of 71816?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71816 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71816?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61816-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61816-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71817", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 85, "D_mm": 110, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 254, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61817 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7217.", "Draw-up on a thin-section 71817 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71817 where a deep-groove 61817 would do: same 85×110×13 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71817 angular-contact bearing?", "a": "A 71817 single-row angular-contact ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 254 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71817 bore code work?", "a": "The last two digits of 71817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61817 deep-groove envelope." }, { "q": "What is the contact angle of 71817?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71817 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71817 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61817-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61817-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71818", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 90, "D_mm": 115, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 267, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61818 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7218.", "The 115 mm outer ring of 71818 is only 12.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 13 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71818 angular-contact bearing?", "a": "A 71818 single-row angular-contact ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 267 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71818 bore code work?", "a": "The last two digits of 71818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61818 deep-groove envelope." }, { "q": "What is the contact angle of 71818?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71818 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71818 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71818 envelope is 90×115×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61818-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61818-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71819", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 95, "D_mm": 120, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 280, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61819 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7219.", "Pair thin-section 71819 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71819 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71819 angular-contact bearing?", "a": "A 71819 single-row angular-contact ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 280 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71819 bore code work?", "a": "The last two digits of 71819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61819 deep-groove envelope." }, { "q": "What is the contact angle of 71819?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71819 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71819?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61819-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61819-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71820", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 100, "D_mm": 125, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 293, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61820 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7220.", "With a 12.5 mm radial section on a 100 mm bore, the 71820 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 125 mm housing.", "A single 71820 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71820 angular-contact bearing?", "a": "A 71820 single-row angular-contact ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 293 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71820 bore code work?", "a": "The last two digits of 71820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61820 deep-groove envelope." }, { "q": "What is the contact angle of 71820?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71820 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71820 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61820-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61820-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71904", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 35, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61904 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 20 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 8.5 mm radial section on a 20 mm bore, the 71904 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 37 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71904 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71904 angular-contact bearing?", "a": "A 71904 single-row angular-contact ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 35 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71904 bore code work?", "a": "The last two digits of 71904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61904 deep-groove envelope." }, { "q": "What is the contact angle of 71904?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71904 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71904?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 9 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 8.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61904-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61904-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71905", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 41, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61905 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 25 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71905 is lighter than on a 72/73 bearing of the same bore: a 9 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71905 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71905 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71905 angular-contact bearing?", "a": "A 71905 single-row angular-contact ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 41 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71905 bore code work?", "a": "The last two digits of 71905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61905 deep-groove envelope." }, { "q": "What is the contact angle of 71905?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71905 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71905 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61905-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61905-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71906", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 47, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61906 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 30 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 47 mm outer ring of 71906 is only 8.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 9 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71906 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71906 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71906 angular-contact bearing?", "a": "A 71906 single-row angular-contact ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 47 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71906 bore code work?", "a": "The last two digits of 71906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61906 deep-groove envelope." }, { "q": "What is the contact angle of 71906?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71906 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71906 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71906 envelope is 30×47×9 mm with a 8.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61906-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61906-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71907", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61907 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (10.0 mm section height at 35 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71907 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71907 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71907 where a deep-groove 61907 would do: same 35×55×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71907 angular-contact bearing?", "a": "A 71907 single-row angular-contact ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 72 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71907 bore code work?", "a": "The last two digits of 71907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61907 deep-groove envelope." }, { "q": "What is the contact angle of 71907?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71907 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71907?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61907-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61907-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71908", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 108, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61908 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.0 mm section height at 40 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 11.0 mm radial section on a 40 mm bore, the 71908 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 62 mm housing.", "Do not run a single 71908 where a deep-groove 61908 would do: same 40×62×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71908 angular-contact bearing?", "a": "A 71908 single-row angular-contact ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 108 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71908 bore code work?", "a": "The last two digits of 71908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61908 deep-groove envelope." }, { "q": "What is the contact angle of 71908?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71908 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71908 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 11.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61908-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61908-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71909", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61909 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.5 mm section height at 45 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71909 is lighter than on a 72/73 bearing of the same bore: a 12 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71909 angular-contact bearing?", "a": "A 71909 single-row angular-contact ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 125 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71909 bore code work?", "a": "The last two digits of 71909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61909 deep-groove envelope." }, { "q": "What is the contact angle of 71909?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71909 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71909 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71909 envelope is 45×68×12 mm with a 11.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61909-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61909-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71910", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 129, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61910 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (11.0 mm section height at 50 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 72 mm outer ring of 71910 is only 11.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 12 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71910 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71910 angular-contact bearing?", "a": "A 71910 single-row angular-contact ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 129 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71910 bore code work?", "a": "The last two digits of 71910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61910 deep-groove envelope." }, { "q": "What is the contact angle of 71910?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71910 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71910?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 12 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 11.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61910-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61910-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71911", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 176, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61911 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 55 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71911 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "A single 71911 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71911 angular-contact bearing?", "a": "A 71911 single-row angular-contact ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 176 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71911 bore code work?", "a": "The last two digits of 71911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61911 deep-groove envelope." }, { "q": "What is the contact angle of 71911?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71911 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71911 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61911-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61911-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71912", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 60, "D_mm": 85, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61912 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 60 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 12.5 mm radial section on a 60 mm bore, the 71912 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 85 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71912 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71912 angular-contact bearing?", "a": "A 71912 single-row angular-contact ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 189 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71912 bore code work?", "a": "The last two digits of 71912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61912 deep-groove envelope." }, { "q": "What is the contact angle of 71912?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71912 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71912 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71912 envelope is 60×85×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61912-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61912-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71913", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 65, "D_mm": 90, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61913 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 65 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71913 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71913 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71913 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71913 angular-contact bearing?", "a": "A 71913 single-row angular-contact ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71913 bore code work?", "a": "The last two digits of 71913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61913 deep-groove envelope." }, { "q": "What is the contact angle of 71913?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71913 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71913?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61913-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61913-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71914", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 70, "D_mm": 100, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 327, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61914 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 70 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 100 mm outer ring of 71914 is only 15.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 16 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71914 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71914 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71914 angular-contact bearing?", "a": "A 71914 single-row angular-contact ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 327 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71914 bore code work?", "a": "The last two digits of 71914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61914 deep-groove envelope." }, { "q": "What is the contact angle of 71914?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71914 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71914 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 15.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61914-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61914-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71915", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 75, "D_mm": 105, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61915 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 75 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71915 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 15.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71915 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71915 where a deep-groove 61915 would do: same 75×105×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71915 angular-contact bearing?", "a": "A 71915 single-row angular-contact ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 346 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71915 bore code work?", "a": "The last two digits of 71915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61915 deep-groove envelope." }, { "q": "What is the contact angle of 71915?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71915 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71915 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71915 envelope is 75×105×16 mm with a 15.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61915-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61915-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71916", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 80, "D_mm": 110, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 365, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61916 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (15.0 mm section height at 80 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 15.0 mm radial section on a 80 mm bore, the 71916 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 110 mm housing.", "Do not run a single 71916 where a deep-groove 61916 would do: same 80×110×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71916 angular-contact bearing?", "a": "A 71916 single-row angular-contact ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 365 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71916 bore code work?", "a": "The last two digits of 71916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61916 deep-groove envelope." }, { "q": "What is the contact angle of 71916?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71916 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71916?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 16 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 15.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61916-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61916-RSR", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71917", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 518, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61917 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 85 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71917 is lighter than on a 72/73 bearing of the same bore: a 18 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71917 angular-contact bearing?", "a": "A 71917 single-row angular-contact ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 518 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71917 bore code work?", "a": "The last two digits of 71917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61917 deep-groove envelope." }, { "q": "What is the contact angle of 71917?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71917 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71917 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 17.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61917-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61917", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71918", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 543, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61918 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 90 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 125 mm outer ring of 71918 is only 17.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 18 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71918 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71918 angular-contact bearing?", "a": "A 71918 single-row angular-contact ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 543 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71918 bore code work?", "a": "The last two digits of 71918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61918 deep-groove envelope." }, { "q": "What is the contact angle of 71918?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71918 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71918 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71918 envelope is 90×125×18 mm with a 17.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "61918-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61918", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71919", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 95, "D_mm": 130, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 568, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61919 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 95 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71919 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 17.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "A single 71919 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71919 angular-contact bearing?", "a": "A 71919 single-row angular-contact ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 568 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71919 bore code work?", "a": "The last two digits of 71919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61919 deep-groove envelope." }, { "q": "What is the contact angle of 71919?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71919 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71919?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 18 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 17.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "61919-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61919-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71920", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 769, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61920 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (20.0 mm section height at 100 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 20.0 mm radial section on a 100 mm bore, the 71920 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 140 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71920 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71920 angular-contact bearing?", "a": "A 71920 single-row angular-contact ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 769 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71920 bore code work?", "a": "The last two digits of 71920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 61920 deep-groove envelope." }, { "q": "What is the contact angle of 71920?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71920 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71920 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 20.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "61920-2RS", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920-RSR", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920-ZZ", "equiv_brand": "NSK", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." }, { "equiv_sku": "61920", "equiv_brand": "SKF", "level": "verify", "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] } ]