312K
NSK631260 × 130 × 31mm
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$65.94
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Specifications
| Bore diameter (d) | 60 mm |
| Outer diameter (D) | 130 mm |
| Width (B) | 31 mm |
| Dynamic load rating (C) | 85.2 kN |
| Static load rating (C₀) | 52 kN |
| Weight | 1240 g |
| Max speed (grease) | 7,000 rpm |
| Max speed (oil) | — |
Equivalents Across Brands
Internal Clearance
Normal Clearance (CN)
Standard radial internal clearance. Suitable for most applications under normal operating conditions.
Best forGeneral-purpose use. Normal temperatures, standard fits, moderate speeds.
TemperatureUp to ~70°C operating temperature
Seal Type
Open (No Seal)
No seals or shields. Allows external lubrication and cooling. Lowest friction, highest speed capability.
Best forClean environments with external lubrication systems. High-speed applications where heat dissipation matters.
Avoid forDirty, dusty, or wet environments. Applications without planned lubrication maintenance.
Examples
- Machine tool spindles
- Gearboxes with oil bath lubrication
- High-speed precision equipment
Where This Bearing Is Used
Large electric motors (50+ HP)Industrial gearboxesHeavy-duty conveyor systemsMining and construction equipmentPaper mill machinerySteel rolling millsLarge compressorsWind turbine components