B8-23D
B8-23D Alternator Bearing 8×23×14
- Size
- 8 × 23 × 14 mm
- Cross-ref
- WAI 10-800-4PFI B8-23DAssembly A3TG0081; A3TG0081A; A3TG0091; A3TG0091A
Product line · Alternator & starter
Alternator Bearings
High-speed, low-noise bearings for automotive alternators and starter motors.
- 71 catalog models
- Z3V3 noise grade
- 1,004 h endurance tested
- Smooth OD · EC · NP structures
Quality system
IATF 16949:2016 certified
- MOQ
- 1000 pcs / model
- Lead time
- 30-45 days
- Shipping
- FOB Ningbo / Shanghai
- Response
- Reply within 12 hours
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
Alternator & starter bearings with full specifications — 22 models
Open a model for dimensions, seal type, speed rating and alternator assembly references.
B10-27D
B10-27D Alternator Bearing 10×27×14
- Size
- 10 × 27 × 14 mm
- Cross-ref
- WAI 10-900-4WPFI B10-27DAssembly LR170746; LR170746B; LR170746C; LR170746E
B10-50D
B10-50D Alternator Bearing 10×27×11
- Size
- 10 × 27 × 11 mm
- Cross-ref
- WAI 10-1050-4PFI B10-50DAssembly LR160-728; LR160-728B; LR160-728C; LR160-728E
SA6202-2RSM
SA6202-2RSM Alternator Bearing 15×35×11
- Size
- 15 × 35 × 11 mm
- Cross-ref
- WAI 6-202-4PFI 6202-2RS C3Bosch 1100900000
SA6303-2RSM
SA6303-2RSM Alternator Bearing 17×47×14
- Size
- 17 × 47 × 14 mm
- Cross-ref
- WAI 6-303-4PFI 6303-2RS C3Bosch 1120905001 / 1120905004 / F00M990410
62202-2RS
62202-2RS Alternator Bearing 15×35×14
- Size
- 15 × 35 × 14 mm
- Cross-ref
- PFI 62202-2RS C3Assembly Marelli: 63300905
62303-2RS
62303-2RS Alternator Bearing 17×47×19
- Size
- 17 × 47 × 19 mm
- Cross-ref
- WAI 6-2303-4PFI 62303-2RS C3
NB101
OTT NB101 Needle Roller Bearing
- Cross-ref
- OE Reference Ford D2OZ-10A304-A; Ford D4HZ-10A304-A; Land Rover RTC5047; Land Rover RTC5926; Chrysler 2095037; Delco 1957004Cross Reference PFI: NB-101; SKF: 491573; FAG / INA: F-45853; BCH06604; BCH06604P; BCH06604PR; Cargo: 140120
- Fits
- Radial shaft support; actual position to confirm
NB1620
OTT NB1620 Needle Roller Bearing
- Cross-ref
- OE Reference John Deere JD9858; Caterpillar 311316; Case T40012; Piaggio 202470Cross Reference PFI: NB-1620; FAG / INA: SCH1620; Koyo: BH-1620; NSK: VSH1620; Torrington: BH-1620
- Fits
- Radial shaft support; actual position to confirm
6201-2RS
6201-2RS Alternator Bearing
- Size
- 12 × 32 × 10 mm
- Cross-ref
- Fits European, Japanese, American alternators
- Fits
- Alternators
B15-69D-2RS
B15-69D-2RS Alternator Bearing
- Size
- 15 × 35 × 13 mm
- Cross-ref
- OEM 949100-2790, (279)Replaces 100211-2030, 100211-2140
- Fits
- Acura alternators
6001-2RS
6001-2RS Starter Motor Bearing
- Size
- 12 × 28 × 8 mm
- Cross-ref
- Fits Bosch, Hitachi, John Deere, NippondensoOEM 1-900-905-103, 900-905-164
- Fits
- Gear reduction starters
6304-2RS
6304-2RS Alternator Bearing
- Size
- 20 × 52 × 15 mm
- Cross-ref
- Fits CAV, Lucas, Rolls RoyceOEM W02X-12 6304 ZZReplaces 1260A288, 1260A030
- Fits
- Heavy-duty alternators
Structure codes
Bearing Prefix & Structure Codes
- No prefix
- Smooth outer diameter — standard press fit into alternator housing
- EC
- Two nylon expansion rings on OD — expansion fit for housings with wider tolerance
- NP
- Eccentric retaining groove machined on OD + snap ring — locks axially in alternator housing
Example: B15-69D = smooth OD · ECB12-85D = expansion rings · NPB15-83D = groove + snap ring
Full catalog
Complete Bearing Specifications
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 |
Page 1
About this product line
About Alternator Bearings
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.
Applications
- Automotive alternators
- Starter motors
- Electric generators
- Small motors
- Gear reduction starters
- Internal fan alternators
Key features
- 01Ultra-low noise and vibration (Z3V3 grade)
- 02High-speed rated for alternator applications
- 03Passed 1,004-hour endurance test
- 04Multiple seal types: 2RS, ZZ, NP, EC
- 05Cold-start capable down to -60°C
- 06Model-by-model OEM cross-reference (Bosch and Denso numbers listed where verified)
- 07100% vibration testing on every bearing
- 08Rubber shielded, double wide, and nylon band options
Manufacturer vs. trader
Why Distributors & OEM Buyers Choose OTT
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
Alternator Brand Coverage
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.
Bosch
NC-series, NI-series, F000AL0xxx
6203, 6303, 6201, B15-69D
Hitachi / Denso
LR, LRB, SC series
6201, 6202, 6203, ECB12-85D
Mitsubishi
A2T, A3T, A5T series
6201, 6303, NPB15-83D
Valeo / Lucas
A13, A14, A127 series
6303, 6304, 6201-2RS
Common bearing designations listed. Contact OTT for specific cross-reference by alternator part number.
Business terms
Factory-direct supply, clear terms.
- MOQ
- 1000 pcs
- Samples
- Sample available upon request
- Lead time
- 30-45 days for standard orders
- Payment
- T/T 30% deposit, 70% before shipment; L/C at sight
- Shipping
- FOB Ningbo / Shanghai
- Customization
- OEM branding, custom specs, packaging customizable
Quality system
Certified to the automotive industry's own standard.
- IATF 16949:2016
- ISO 14001:2015
- ISO 45001:2018
- RoHS
- REACH
Reply within 12 hours
Including weekends
What makes OTT alternator bearings different from standard bearings?
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.
What OEM alternators do OTT bearings fit?
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.
Can OTT alternator bearings handle extreme cold?
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
Explore other bearing types
Request for quotation
Send us a part number. Get an engineer’s answer.
Share an OE or competitor number, a drawing or target dimensions and your annual volume. Samples available for qualified projects.
- MOQ
- 1000 pcs / model
- Lead time
- 30-45 days for standard orders
- Shipping
- FOB Ningbo / Shanghai