B39-5 Open Mini Non-Standard CVT Control Shaft Deep Groove Bearing

B39-5 non-standard single-row ultra-thin open deep groove ball bearing, overall dimension 39mm inner bore × 52mm outer diameter × 5mm extra-narrow width, fully interchangeable with original NSK B39-5, specially matched for Toyota K310, K313 CVT tiny control valve and auxiliary micro shafts. Open design without rubber seals, equipped with lightweight stamped low-carbon steel cage and factory standard C0 internal clearance, C3 clearance customizable on demand. It bears light radial load and tiny bidirectional axial load, runs silent and stable under long-time ultra-high-speed rotation and high-temperature CVT fluid inside sealed transmission housing. Produced with fully quenched high-purity GCr15 chrome bearing steel and strict micron-level dimensional tolerance control, fully compatible with OEM B39-5 assembly standards. Complete formal quotation will be provided within 24 hours upon inquiry.

• Open through structure enables full circulation of CVT transmission oil, outstanding continuous heat dissipation, eliminates rubber seal aging, swelling and oil leakage risks under long-term high-temperature oil soaking
• Superfinished smooth deep groove raceway cuts rolling friction, maintains steady ultra-high-speed rotation under frequent slight torque fluctuation of miniature control shafts
• High-purity quenched GCr15 thin wall inner and outer rings own reliable wear resistance and anti-fatigue performance, prolong the whole CVT service life effectively
• OEM unified compact installation dimensions, direct replacement without modifying transmission housing, micro shaft and matching small accessories
• Ultra-light stamped steel cage minimizes rotation inertia, perfectly fits continuous ultra-high-speed stable working conditions of CVT miniature control components
• Standard P0 precision grade, P6 / C3 clearance customizable to meet mainstream auto OEM assembly matching requirements
• Stable mass production and sufficient stock, cost-effective for auto repair aftermarket and bulk OEM supporting orders

Toyota K310, K313 CVT miniature control valve shafts, compact car automatic gearbox tiny auxiliary shafts, light commercial vehicle micro reducers, small precision agricultural machinery transmission moving parts.

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.

• 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 B39-5 bearings pass multi-process strict factory inspection.

Send bulk inquiry for B39-5 open ultra-thin CVT miniature control shaft bearings and obtain the following full support:

1. Complete formal detailed quotation within 24 hours
2. Standard dimension drawings & micro 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.

Q1: What is the difference between open B39-5 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 B39-5 replace original NSK OEM bearings directly?
A2: Yes, inner bore, outer diameter and ultra-narrow width dimensions are fully consistent, no modification to CVT micro 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.