B33Z-12 Open Z Superfinished Raceway CVT Auxiliary Shaft Deep Groove Bearing

B33Z-12 non-standard single-row open deep groove ball bearing, overall dimension 33mm inner bore × 58mm outer diameter × 12mm width. The suffix Z stands for precision superfinished raceway with ultra-low friction loss, fully interchangeable with original NSK B33Z-12, matched for Toyota K310, K313 series CVT small intermediate transmission auxiliary shafts. Open design without rubber sealing rings, equipped with stamped low-carbon steel cage and standard C0 internal clearance, C3 clearance available for customization. It bears moderate radial load and slight two-way axial load, running quiet and stable under long-term high-speed variable torque vibration and high-temperature CVT oil environment inside sealed gearbox housing. Manufactured with fully quenched high-purity GCr15 bearing steel and strict micron-level dimensional tolerance control, completely compatible with OEM B33Z-12 assembly standards. Complete formal quotation will be provided within 24 hours after receiving your inquiry.

• Open through-hole structure allows full circulation of CVT transmission oil for continuous efficient heat dissipation, avoids rubber seal aging, swelling and oil leakage failures caused by long-time high-temperature oil immersion
• Upgraded Z-type ultra-smooth raceway greatly reduces rolling friction coefficient, less heat accumulation during high-speed operation, maintains stable smooth rotation under frequent torque fluctuation of CVT intermediate shafts
• High-hardness integrated GCr15 inner and outer rings deliver excellent wear resistance and fatigue resistance, significantly extend the whole service life of CVT transmission system
• OEM unified overall installation dimensions, direct plug-and-play replacement without modifying gearbox housing, intermediate shaft and matching assembly accessories
• Lightweight stamped steel cage reduces rotation inertia, perfectly adapts to long-term continuous medium-high speed stable working conditions of CVT variable transmission
• Standard P0 precision grade, P6 accuracy and C3 internal clearance can be customized to meet matching requirements of mainstream auto OEM factories
• Stable mass production capacity with sufficient stock supply, high cost performance for auto repair aftermarket and bulk OEM supporting orders

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

25+ years professional manufacturer of B series non-standard CVT and gearbox bearings. All finished bearings pass high-speed continuous rotation test, shock load test and long-cycle fatigue durability test before delivery. Custom anti-rust surface coating and special high-temperature anti-wear CVT dedicated lubricant filling service are supported. One-on-one professional transmission installation technical guidance and formal detailed quotation within 24 hours for all RFQs. Stable mass production 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 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 B33Z-12 bearings pass multi-process strict factory inspection.

Send bulk inquiry for B33Z-12 open Z raceway CVT small 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.

1. Q1: What does suffix Z mean for B33Z-12?
   A1: Z represents ultra-smooth superfinished optimized deep raceway structure, lower friction and less heat generation compared with basic model B33-12, specially designed for long-term high-speed operation of CVT internal small shafts.
2. Q2: What is the difference between open B33Z-12 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.
3. Q3: Can B33Z-12 directly replace original NSK OEM bearings?
   A3: Yes, inner bore, outer diameter and width dimensions are fully consistent, no modification to CVT shaft components required during replacement.