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63 Series
Home Deep Groove Ball Bearings 63 Series

6312 ZZ Robust Deep Groove Ball Bearing For Heavy-Duty Electric Motors | 60×130×31 mm

6312 ZZ Robust Deep Groove Ball Bearing For Heavy-Duty Electric Motors | 60×130×31 mm

The 6312 ZZ is a robust, single-row deep groove ball bearing engineered for reliable performance in heavy-duty industrial applications requiring high load capacity and contamination resistance. Featuring dual Z-type metal shields, this bearing provides effective protection against dust and solid contaminants while maintaining low frictional torque. With a 60 mm bore and a 31 mm width, it is a preferred choice for large electric motors, pumps, and gearboxes where balanced load capacity and extended service life are essential.

6312 ZZ Deep Groove Ball Bearing 60x130x31 mm | ISO 63 Series – Medium | Double Shielded

This precision bearing utilizes a robust deep groove raceway geometry, enabling stable high-speed performance up to 6,400 r/min (Grease). The 6312 ZZ is engineered to accommodate substantial radial loads as well as axial loads in both directions, making it exceptionally suited for heavy-duty applications in electric motors, industrial machinery, and power transmission equipment where consistent, low-friction operation is required.

6312 ZZ Robust Deep Groove Ball Bearing For Heavy-Duty Electric Motors | 60×130×31 mm

Comprehensive Applications

Ideal for a diverse range of heavy-duty industrial and mechanical systems:

Electric Motors & Power Generation
  • Industrial Generators and Alternators
  • Motor Repair and Rewind Applications
  • Pump and Compressor Drives
  • Large AC and DC Electric Motors
Industrial Machinery & Drive Systems
  • Centrifugal and Positive Displacement Pumps
  • Large Fans, Blowers, and Ventilation Systems
  • Conveyor Systems and Material Handling Equipment 
  • Industrial Gearboxes and Speed Reducers
Heavy Equipment & Processing
  • Textile Machinery and Spinning Equipment
  • Rolling Mill Machinery and Industrial Valves
  • Woodworking and Printing Machinery 
  • Paper and Pulp Processing Machinery
General Engineering & Infrastructure
  • HVAC Systems and Cooling Towers
  • Elevators and Hoisting Equipment
  • Construction and Farm Machinery
  • Oil Field and Mining Equipment 

Key Performance Features

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.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series – Medium
Basic Designation 6312
Suffix ZZ (Both sides with steel shields)
Bore Diameter (d) 60 mm
Outer Diameter (D) 130 mm
Width (B) 31 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class ABEC 1 / ISO P0 (Standard); ABEC 3 Available
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) 90 kN  
Static Load Rating (C₀ʳ) 52 kN
Limiting Speed (Grease) 5,300 - 6,400 r/min
Limiting Speed (Oil) 6,300 - 9,100 r/min 
Weight (approx.) 1.72 kg

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."

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Request a Quote for Ball Bearings
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