• Industrial Generators and Alternators
• Motor Repair and Rewind Applications
• Pump and Compressor Drives
• Large AC and DC Electric Motors

• Centrifugal and Positive Displacement Pumps
• Large Fans, Blowers, and Ventilation Systems
• Conveyor Systems and Material Handling Equipment 
• Industrial Gearboxes and Speed Reducers

• Textile Machinery and Spinning Equipment
• Rolling Mill Machinery and Industrial Valves
• Woodworking and Printing Machinery 
• Paper and Pulp Processing Machinery

• HVAC Systems and Cooling Towers
• Elevators and Hoisting Equipment
• Construction and Farm Machinery
• Oil Field and Mining Equipment 

01. Robust Design with High Load Capacity

Conforming to the popular 63-series medium section, the 60×130×31 mm configuration delivers a dynamic load rating of 90 kN. This robust construction ensures reliable performance in heavy-duty applications where substantial radial and axial forces are present.

02. Effective Contaminant Exclusion

Double Z-type non-contact steel shields provide a reliable barrier against dust, dirt, and other airborne particulates from both sides. This design helps retain lubricant integrity and significantly extends the operational life of the bearing in harsh environments without introducing significant rotational drag.

03. Optimized for High-Speed and Quiet Operation

Precision-manufactured components with super-finished raceways ensure consistent, quiet operation with minimal vibration. Electric Motor Quality (EMQ) standards make this bearing ideal for high-speed applications like electric motors where low noise and smooth running are critical.

Interchange Part Numbers

Direct replacement for:

• SKF: 6312-2Z / 6312-2Z/C3 
• NSK: 6312ZZ / 6312ZZCM 
• FAG: 6312-2Z
• NTN: 6312ZZ 
• KOYO: 6312ZZ
• TIMKEN: 6312-ZZ 

Design & Configuration

The 6312 ZZ is furnished with double Z-type steel shields as standard, delivering enhanced internal protection in dusty or debris-prone industrial conditions. The pressed steel cage provides robust ball guidance and durability under normal operating conditions . For applications requiring a hermetic seal against moisture or finer contaminants, the double rubber-sealed variant (6312 2RS) is also available. For applications involving higher operating temperatures or shaft expansion, a C3 internal clearance variant (6312 ZZ C3) can be supplied.

"The 6312 ZZ is a versatile workhorse for heavy-duty electric motors and industrial drives, combining high load capacity with effective contamination protection for long-term, maintenance-free operation."