B31-13 Open Non-Standard CVT Intermediate Shaft Deep Groove Bearing

1. Product Overview

B31-13 non-standard single-row open deep groove ball bearing, overall dimension 31mm inner bore × 54mm outer diameter × 13mm width, fully interchangeable with original NSK B31-13 and equivalent HTFB31-13E, widely matched to Japanese CVT intermediate auxiliary shafts and miniature differential assemblies. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0 internal clearance, C3 clearance customizable on demand. It bears moderate radial load and slight bidirectional axial load, runs low-noise and stable under long-term high-speed variable vibration and high-temperature CVT oil 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 B31-13 assembly requirements. Complete formal quotation will be provided within 24 hours upon inquiry.

2. Key Advantages

• Open through structure enables full circulation of CVT transmission oil for continuous efficient heat dissipation, eliminates rubber seal aging, swelling and oil leakage risks under long-term high-temperature oil immersion
• Superfinished ultra-smooth deep groove raceway reduces rolling friction coefficient, maintains steady continuous rotation under frequent shifting torque fluctuation of intermediate shafts
• Uniform high-hardness integral GCr15 inner and outer rings deliver outstanding wear resistance and anti-fatigue performance, effectively extend overall service cycle of CVT transmission system
• OEM unified installation dimensions, direct plug-and-play replacement without modifying transmission housing, intermediate shaft and matching small installation accessories
• Lightweight stamped steel cage lowers rotation inertia, perfectly adapts to long-term continuous medium-high speed stable 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, high cost performance for auto repair aftermarket and bulk OEM supporting orders

3. Applications

Japanese passenger car CVT transmission intermediate auxiliary shafts, compact car automatic gearbox miniature differential assemblies, light commercial vehicle micro reducers, small precision agricultural machinery transmission moving components.

4. Technical Specifications

Dimension drawings and technical spec sheets can be provided on request.

5. Why Choose GQZ Bearing

25+ years professional manufacturer of B & HTFB 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 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 B31-13 bearings pass multi-process strict factory inspection.

7. CTA

Send bulk inquiry for B31-13 open CVT intermediate 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 is the difference between open B31-13 and rubber sealed bearings?
A1: 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.

Q2: Can B31-13 replace original NSK OEM bearings directly?
A2: Yes, inner bore, outer diameter and width dimensions are fully consistent, no modification to CVT shaft components required during replacement.

Q3: Applicable lubrication mode?
A3: Designed for CVT circulating transmission oil lubrication; high-speed anti-wear gear grease can be filled if used for independent separate assembly.