B57Z-8 Double Z Metal Shield Deep Groove Auto Gearbox Bearing

1. Product Overview

B57Z-8 non-standard deep groove ball bearing, size 57.8×80×13mm, specially matched for automobile gearbox auxiliary shafts. Suffix Z stands for double-sided stamped metal dust shields, without rubber seals, fitted with stamped steel cage and C0 standard clearance. It bears radial load and minor bidirectional axial load, runs stably and quietly at high speed under frequent shift vibration. Made of fully quenched GCr15 steel with precise dimensional tolerance, fully interchangeable with original B57Z-8. Quotation will be provided within 24 hours after inquiry.

2. Key Advantages

• Double all-metal Z shields resist high gear oil temperature, no rubber seal aging or swelling risk under long-time oil soaking
• Small gaps between shields allow smooth gear oil circulation inside gearbox, excellent heat dissipation
• Low-friction deep groove raceway, stable operation under continuous gear shifting impact
• High-hardness GCr15 steel delivers excellent wear and fatigue resistance to lengthen transmission service life
• Matches original equipment dimensions, direct replacement without modifying housings or shafts
• Light stamped steel cage reduces rotation inertia, suitable for continuous medium-high speed transmission
• Standard P0 precision, customizable P6 grade to meet OEM assembly standards

3. Applications

Auto manual & CVT gearbox intermediate shafts, tractor transmission assemblies, light commercial vehicle reducers, medium-speed agricultural machinery transmission parts.

4. Technical Specifications

5. Why Choose GQZ Bearing

25+ years professional maker of non-standard Z shield vehicle gearbox bearings. All units pass high-speed rotation, shock load and fatigue durability tests before delivery. Custom anti-rust coating and high-temperature gearbox grease filling available. Fast quotation and one-on-one installation technical support within 24h for all RFQs. Stable mass production satisfies bulk OEM and global distributor orders, factory direct price with consistent quality and on-time shipment.

6. Quality Assurance

• Raw steel hardness & composition inspection;
• Raceway grinding roughness test;
• Z metal shield dust circulation aging test;
• Vibration high-speed fatigue test;
• Full dimension sorting;
• 100% visual inspection before packing;
• Random sampling performance test before shipment.

All B57Z-8 bearings pass multi-step strict inspection.

7. CTA

Send bulk inquiry for B57Z-8 double Z shield transmission bearings and receive:

1. Complete formal quotation within 24 hours
2. Dimension drawings & press-fit installation guidance
3. Custom anti-rust treatment and special lubricant service
4. Exclusive long-term bulk factory wholesale price without middle markup

Large-volume OEM cooperation is welcome anytime.