B39Z-10 Open Optimized Raceway CVT Small Shaft Deep Groove Bearing

1. Product Overview

B39Z-10 non-standard single-row open deep groove ball bearing, dimension 39mm inner bore × 66mm outer diameter × 10mm narrow width, suffix Z represents ultra-smooth optimized internal raceway for low friction high-speed operation, fully interchangeable with original NSK B39Z-10, matched to Toyota K310/K313 series CVT small control auxiliary shafts. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0 internal clearance, C3 clearance customizable. It bears light to medium radial load and slight bidirectional axial load, runs ultra-quiet and stable under long-term continuous high-speed rotation and high-temperature CVT fluid environment inside sealed transmission housing. Manufactured with fully quenched high-purity GCr15 chrome bearing steel and strict micron-level dimensional tolerance control, fully compatible with OEM B39Z-10 assembly requirements. Complete formal quotation will be provided within 24 hours upon inquiry.

2. Key Advantages

• Open through structure allows full circulation of CVT transmission oil, continuous efficient heat dissipation, completely avoids rubber seal aging, swelling and oil leakage defects under long-term high-temperature oil immersion
• Exclusive Z super-finished raceway treatment reduces rolling friction coefficient significantly, less heat accumulation during high-speed operation, stable smooth rotation under frequent variable torque impact of CVT shafts
• Uniform high-hardness integral GCr15 inner and outer rings feature excellent wear resistance and anti-fatigue performance, effectively extend overall service life of CVT transmission system
• OEM unified mounting overall dimensions, direct plug-and-play replacement without modifying transmission housing, small auxiliary shaft and matching installation accessories
• Compact lightweight stamped steel cage lowers rotation inertia, perfectly adapts to long-term continuous stable high-speed working conditions of CVT variable transmission
• Standard P0 precision grade, P6 / C3 clearance customizable to meet mainstream auto OEM assembly matching standards
• Stable mass production with sufficient stock supply, cost-effective for auto repair aftermarket and bulk OEM supporting orders

3. Applications

Toyota K310, K313 CVT transmission small control auxiliary shafts, compact car automatic gearbox miniature differential assemblies, light commercial vehicle tiny reducers, small agricultural machinery transmission core moving components.

4. Technical Specifications

5. Why Choose GQZ Bearing

25+ years professional manufacturer of B series non-standard CVT & gearbox bearings. All finished bearings pass high-speed continuous rotation test, shock load test and long-cycle fatigue durability test before delivery. Support customized anti-rust surface coating and special high-temperature anti-wear CVT lubricant filling service. One-on-one professional transmission installation technical guidance and formal detailed quotation within 24h for all RFQs. Stable mass production capacity supports long-term bulk aftermarket and OEM orders, factory direct selling price, stable consistent quality and punctual batch delivery.

6. Quality Assurance

• Raw GCr15 steel hardness & chemical composition incoming inspection
• High-precision Z-type raceway superfinishing roughness detection
• Open bearing CVT oil circulation high-temperature aging durability test
• Continuous vibration load rotation fatigue life cycle test
• Full dimension tolerance sorting inspection
• 100% visual appearance marking check before packaging
• Random sampling high-speed performance test before shipment
• All B39Z-10 bearings pass multi-process strict factory inspection.

7. CTA

Send bulk inquiry for B39Z-10 open Z raceway CVT small auxiliary shaft bearings and obtain the following full support:

1. Complete formal detailed quotation within 24 hours
2. Standard dimension drawings & shaft press-fit installation operation guidance
3. Custom anti-rust surface treatment and special CVT transmission lubricant filling service
4. Exclusive long-term bulk factory wholesale price without intermediate markup

Large-volume OEM cooperation is welcome anytime.

8. FAQ

Q1: What does suffix Z stand for in B39Z-10?
A1: Z means ultra-smooth super-finished optimized deep raceway structure, lower friction and less heat generation compared with base model B39-10, specially designed for long-term high-speed CVT internal shaft operation.

Q2: Difference between open B39Z-10 and rubber sealed bearings?
A2: Open bearing has no rubber sealing lips, installed inside closed CVT housing relying on circulating transmission oil for lubrication and cooling; rubber sealed bearings are used for external exposed dusty shafts with independent grease lubrication.

Q3: Can B39Z-10 replace original NSK OEM bearings directly?
A3: Yes, inner bore, outer diameter and width dimensions are fully consistent, no modification to CVT shaft components required during replacement.