IATF 16949 CertifiedSince 2011 · Jiashan County, China
Product line · Alternator & starter
High-speed, low-noise bearings for automotive alternators and starter motors.
Searches OTT part numbers, OE numbers and SKF / FAG / KOYO / NTN / NSK / SNR cross-references.
No listed model matches . OTT also builds to OE number and drawing — send us this part number.Detailed models
Open a model for dimensions, seal type, speed rating and alternator assembly references.
6303 Alternator Bearing
6202-2RS Alternator Bearing
608-2RS Miniature Alternator Bearing
6203-2RS Alternator Bearing
B8-23D Alternator Bearing 8×23×14
B10-27D Alternator Bearing 10×27×14
B10-50D Alternator Bearing 10×27×11
SA6202-2RSM Alternator Bearing 15×35×11
SA6303-2RSM Alternator Bearing 17×47×14
62202-2RS Alternator Bearing 15×35×14
62303-2RS Alternator Bearing 17×47×19
OTT NB101 Needle Roller Bearing
OTT NB1620 Needle Roller Bearing
336 2RS Alternator Bearing
382-2RS Alternator Bearing
B15-86D Alternator Bearing
B17-127D Alternator Bearing
6000ZZ Deep Groove Ball Bearing
6003-2RS Deep Groove Ball Bearing
62-28 2RS Deep Groove Ball Bearing
6202-16-2RS Deep Groove Ball Bearing
62201 2RS Deep Groove Ball Bearing
62304-17-2RS Alternator Bearing
B15-83D Alternator Bearing
B17-116D Alternator Bearing
B17-126D Alternator Bearing
B17-52D Alternator Bearing
B17-99D Alternator Bearing
B15-69DNR Alternator Bearing
SA279 2RS Alternator Bearing
SA333 2RS Alternator Bearing
SA6003RSM Alternator Bearing
SA6201RSM Alternator Bearing
SA63001RSM Alternator Bearing
6201-2RS Alternator Bearing
B15-69D-2RS Alternator Bearing
6001-2RS Starter Motor Bearing
6304-2RS Alternator Bearing
Structure codes
Example: B15-69D = smooth OD · ECB12-85D = expansion rings · NPB15-83D = groove + snap ring
Full catalog
Dimensions in mm · Load ratings in N · Speed in rpm
| Model | DT (sealed variant) | d | D | B | r min | Cr (N) | Cor (N) | RPM Grease | RPM Contact | RPM Oil |
|---|---|---|---|---|---|---|---|---|---|---|
| B8-74D | NPB8-74D-2RS | 8 | 22 | 11 | 0.3 | 3,350 | 1,370 | 32,000 | 28,000 | 37,000 |
| B8-79D | B8-79D-2RS | 8 | 23 | 11 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B8-79D | NPB8-790-2RS | 8 | 23 | 11 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B8-79D | ECB8-79D-2RS | 8 | 23 | 11 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B8-85D | B8-85D-2RS | 8 | 23 | 14 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B8-85D | NPB8-85D-2RS | 8 | 23 | 14 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B8-23D | ECB8-85D-2RS | 8 | 23 | 14 | 0.3 | 3,910 | 1,530 | 34,000 | 30,000 | 40,000 |
| B10-46D | NPB10-46D-2RS | 10 | 23 | 11 | 0.3 | 2,700 | 1,270 | 33,000 | 23,000 | 38,000 |
| 6000TT | EC6000-2RS | 10 | 26 | 8 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| 62000-2RS | 62000-2RS | 10 | 26 | 10 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| B10-51D | B10-50D-2RS | 10 | 27 | 11 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| B10-50D | ECB10-50D-2RS | 10 | 27 | 11 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| B10-50D | NPB10-50D-2RS | 10 | 27 | 11 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| B10-27D | ECB10-27D-2RS | 10 | 27 | 14 | 0.3 | 4,570 | 1,970 | 30,000 | 22,000 | 36,000 |
| 6200E4-2RS | 6200E4-2RS | 10 | 30 | 9 | 0.6 | 5,100 | 2,390 | 25,000 | 18,000 | 30,000 |
| EC6001-2RS | EC6001-2RS | 12 | 28 | 8 | 0.3 | 5,100 | 2,370 | 26,000 | 18,000 | 30,000 |
| 6201-2RS | 6201-2RS | 12 | 28 | 10 | 0.3 | 5,100 | 2,370 | 26,000 | 18,000 | 30,000 |
| EC6201-2RS | EC6201-2RS | 12 | 32 | 10 | 0.6 | 6,800 | 3,050 | 22,000 | 16,000 | 26,000 |
| NP6201-2RS | NP6201-2RS | 12 | 32 | 10 | 0.6 | 6,800 | 3,050 | 22,000 | 16,000 | 26,000 |
| B12-57D | NPB12-57D-2RS | 12 | 32 | 13 | 0.6 | 6,800 | 3,050 | 22,000 | 16,000 | 26,000 |
| 62201-2RS | 62201-2RS | 12 | 32 | 14 | 0.6 | 6,800 | 3,050 | 22,000 | 16,000 | 26,000 |
| B12-53D | B12-53D-2RS | 12 | 40 | 10 | 0.6 | 7,690 | 3,830 | 20,000 | 14,000 | 24,000 |
| B12-79D | B12-79D-2RS | 12 | 40 | 10/14 | 0.6 | 9,550 | 4,800 | 18,000 | 19,000 | 21,000 |
| B12-40D | B12-40D-2RS | 12 | 40 | 12 | 1 | 9,700 | 4,200 | 20,000 | 15,000 | 24,000 |
| 12BC04S3 | 12BC04S3-2RS | 12 | 42 | 10 | 0.6 | 9,550 | 4,800 | 18,000 | 10,000 | 21,000 |
| 83B880 | 83B880-2RS | 13 | 30 | 8 | 0.3 | 5,100 | 2,370 | 26,000 | 18,000 | 30,000 |
| 6203d14-2RS | 6203d14-2RS | 14 | 40 | 12 | 0.6 | 9,550 | 4,800 | 17,000 | 12,000 | 20,000 |
| 366 | 366-2RS | 15 | 32 | 11 | 0.3 | 5,600 | 2,840 | 23,000 | 14,000 | 28,000 |
| 6202TT | EC6202-2RS | 15 | 35 | 11 | 0.6 | 7,750 | 3,570 | 20,000 | 14,000 | 24,000 |
| 279 | B15-69D-2RS | 15 | 35 | 13 | 0.6 | 7,750 | 3,750 | 20,000 | 14,000 | 24,000 |
| B15-69 | NPB15-69D-2RS | 15 | 35 | 13 | 0.6 | 7,750 | 3,750 | 20,000 | 14,000 | 24,000 |
| 62202-2RS | 62202-2RS | 15 | 35 | 14 | 0.6 | 7,650 | 3,750 | 19,000 | 14,000 | 23,000 |
| SC0299ZLU | SC0299ZLU | 15 | 38 | 12 | 0.6 | 7,750 | 3,750 | 20,000 | 14,000 | 24,000 |
| 348 | 348-2RS | 15 | 38 | 19 | 0.6 | 7,750 | 3,750 | 20,000 | 14,000 | 24,000 |
| B15-85D | B15-85D-2RS | 15 | 40 | 14 | 0.6 | 9,550 | 4,800 | 17,000 | 12,000 | 20,000 |
| 319 | 319-2RS | 15 | 43 | 13 | 1 | 11,400 | 5,450 | 17,000 | 13,000 | 20,000 |
| B15-45D | B15-45D-2RS | 15 | 45 | 14 | 1 | 13,580 | 6,590 | 15,000 | 11,000 | 18,000 |
| 336 | 336-2RS | 15 | 46 | 14 | 1 | 13,580 | 6,590 | 15,000 | 11,000 | 18,000 |
| B15-86D | B15-86D-2RS | 15 | 47 | 14 | 1 | 13,580 | 6,590 | 15,000 | 11,000 | 18,000 |
| B15-83D | B15-83D-2RS | 15 | 47 | 18 | 1 | 13,580 | 6,590 | 15,000 | 11,000 | 18,000 |
| 382-2RS | 382-2RS | 15 | 52 | 16 | 1 | 15,930 | 7,875 | 14,000 | 10,000 | 17,000 |
| 6003DW-2RS | 6003DW-2RS | 15.8 | 35 | 10 | 0.3 | 6,000 | 3,250 | 20,000 | 14,000 | 24,000 |
| 6202-16-2RS | 6202-16-2RS | 16 | 35 | 11 | 0.6 | 7,650 | 3,750 | 19,000 | 14,000 | 23,000 |
| 6203-16-2RS | 6203-16-2RS | 16 | 40 | 12 | 0.6 | 9,550 | 4,800 | 18,000 | 13,000 | 21,000 |
| 63003-2RS | 63003-2RS | 17 | 35 | 14 | 0.3 | 6,000 | 3,250 | 20,000 | 15,000 | 24,000 |
| 6203TT | EC6203-2RS | 17 | 40 | 12 | 0.6 | 9,550 | 4,800 | 17,000 | 12,000 | 20,000 |
| 6203/14-2RS | 6203/14-2RS | 17 | 40 | 14 | 0.6 | 9,550 | 4,800 | 18,000 | 13,000 | 21,000 |
| B17-92D | B17-92D | 17 | 42 | 12 | 0.6 | 9,550 | 4,800 | 17,000 | 12,000 | 21,000 |
| B17-107D | B17-107D-2RS | 17 | 47 | 18 | 1 | 13,580 | 6,590 | 15,000 | 11,000 | 18,000 |
| 62303-2RS | 62303-2RS | 17 | 47 | 19 | 1 | 13,600 | 6,650 | 16,000 | 11,000 | 19,000 |
| B17-52D | B17-52D-2RS | 17 | 52 | 15 | 1.1 | 15,930 | 7,875 | 14,000 | 10,000 | 17,000 |
| 333 | 333-2RS | 17 | 52 | 16 | 1.1 | 15,930 | 7,875 | 14,000 | 10,000 | 17,000 |
| B17-99D | B17-99D-2RS | 17 | 52 | 17 | 1.1 | 15,930 | 7,875 | 14,000 | 10,000 | 17,000 |
| B17-116D | B17-116D-2RS | 17 | 52 | 18 | 1.1 | 15,930 | 7,875 | 14,000 | 10,000 | 17,000 |
| 62304-17-2RS | 62304-17-2RS | 17 | 52 | 21 | 1.1 | 15,900 | 7,900 | 14,000 | 10,000 | 17,000 |
| B17-126D | B17-126D-2RS | 17 | 62 | 17.6 | 1.1 | 21,200 | 10,900 | 12,000 | 8,000 | 14,000 |
| B17-127D | B17-127D-2RS | 17 | 62 | 20 | 1.1 | 21,200 | 10,900 | 12,000 | 8,000 | 14,000 |
| 6904DW-2RS | 6904DW-2RS | 18.8 | 37 | 9 | 0.3 | 6,400 | 3,700 | 19,000 | 13,000 | 23,000 |
| 6905d20-2-2RS | 6905d20-2-2RS | 20 | 42 | 9 | 0.3 | 7,050 | 4,550 | 10,000 | 16,000 | 20,000 |
| 63004-2RS | 63004-2RS | 20 | 42 | 16 | 0.6 | 9,400 | 5,000 | 18,000 | 12,000 | 21,000 |
| 6004d2-2RS | 6004d2-2RS | 20 | 42 | 12 | 0.6 | 9,400 | 5,000 | 18,000 | 12,000 | 21,000 |
| EC6204-2RS | EC6204-2RS | 20 | 47 | 14 | 1 | 12,800 | 6,600 | 16,000 | 11,000 | 18,000 |
| B20-122 | B20-122 | 20 | 47 | 16 | 1 | 12,800 | 6,600 | 14,000 | 10,000 | 18,000 |
| 6004DW-2RS | 6004DW-2RS | 20 | 42 | 12 | 0.6 | 9,400 | 5,000 | 18,000 | 12,000 | 21,000 |
| 6204DW-2RS | 6204DW-2RS | 20 | 47 | 14 | 1 | 12,800 | 6,600 | 16,000 | 11,000 | 18,000 |
| 6905d2-2RS | 6905d2-2RS | 25 | 42 | 9 | 0.3 | 7,050 | 4,550 | 10,000 | 16,000 | 20,000 |
| 63305-2RS | 63305-2RS | 25 | 62 | 25.4 | 1.1 | 21,200 | 10,900 | 12,000 | 10,000 | 14,000 |
| B25-139D | B25-139D | 25 | 68 | 18 | 1.1 | 21,200 | 10,900 | 11,000 | 7,500 | 14,000 |
| 6306d25-2RS | 6306d25-2RS | 25 | 72 | 19 | 1.1 | 26,700 | 15,000 | 6,300 | 9,200 | 11,000 |
| 6906d2-2RS | 6906d2-2RS | 30 | 47 | 9 | 0.3 | 7,250 | 5,000 | 14,000 | 10,000 | 17,000 |
| 6302d32-2RS | 6302d32-2RS | 32 | 55 | 13 | 1 | 13,200 | 8,300 | 8,000 | 12,000 | 15,000 |
About this product line
OTT alternator bearings are precision deep groove ball bearings designed for high-speed rotation in automotive electrical systems. Featuring low-noise, low-vibration performance with various seal configurations. Passed 1,004-hour endurance testing by a Russian OEM. Capable of successful cold starts in environments as low as -60°C. Our catalog covers 60+ models with complete OEM cross-reference to Bosch, Hitachi, Mitsubishi, Nippondenso, Delco, and other major alternator manufacturers.
Manufacturer vs. trader
Factory-direct pricing. No trading company layer. IATF 16949 process control.
| Criteria | OTT (Manufacturer) | Typical Trading Company |
|---|---|---|
| Production | In-house factory — own machines, own workers | Buys from multiple factories, no production control |
| Certification | IATF 16949 + ISO 14001 | May hold ISO 9001 (quality management only) |
| Noise Grade | Z3V3 — 100% vibration tested before shipment | Grade varies by source factory; not always tested |
| Endurance | 1,004-hour continuous test (Russian OEM verified) | No factory-level endurance data available |
| Customization | Custom specs, OEM branding, laser engraving | Limited — depends on source factory cooperation |
| Pricing | Factory cost + margin — no middleman markup | Factory cost + factory margin + trading margin |
| Traceability | Full batch traceability from raw material | Often limited to purchase order level only |
OTT supplies alternator bearings to automotive parts distributors, alternator remanufacturers, and OEM assembly plants in 50+ countries. Request a sample batch to verify quality before placing bulk orders.
Request Wholesale PricingOEM alternator brands
Common bearing sizes used across these alternator families. Fitment varies by alternator model — the same brand uses different bearings — so check the cross-reference on each bearing page or send us your OEM number to confirm before ordering.
NC-series, NI-series, F000AL0xxx
6203, 6303, 6201, B15-69D
LR, LRB, SC series
6201, 6202, 6203, ECB12-85D
A2T, A3T, A5T series
6201, 6303, NPB15-83D
A13, A14, A127 series
6303, 6304, 6201-2RS
Common bearing designations listed. Contact OTT for specific cross-reference by alternator part number.
Business terms
Quality system
Reply within 12 hours
Including weekends
OTT alternator bearings are manufactured with tighter tolerances for ultra-low noise and vibration. They undergo 100% vibration testing and are available with specialized greases for high-speed, high-temperature alternator environments. Our bearings passed a rigorous 1,004-hour endurance test conducted by a Russian OEM partner.
OTT makes the bearing sizes used in Bosch, Denso, Hitachi, Mitsubishi, Valeo and other alternators, but fitment depends on the exact alternator model — the same brand uses different bearings across its range, so not every OTT bearing fits every Bosch or Denso unit. Each bearing page lists the OEM numbers we have verified (for example, SA6202-2RSM and SA6303-2RSM list Bosch and Denso part numbers). Send us your alternator part number or OEM bearing number and we will confirm the match before you order.
Yes. OTT alternator bearings are tested for cold-start capability down to -60°C, making them suitable for Arctic and extreme cold climate applications. This was validated through endurance testing with a Russian OEM partner.
Product lines
Request for quotation
Share an OE or competitor number, a drawing or target dimensions and your annual volume. Samples available for qualified projects.
