6311SR
Higher load capacity than the 6200 series for the same bore size. Used where heavier radial loads are expected.
SKF631155 × 120 × 29mm
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$54.69
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Specifications
| Bore diameter (d) | 55 mm |
| Outer diameter (D) | 120 mm |
| Width (B) | 29 mm |
| Dynamic load rating (C) | 74.1 kN |
| Static load rating (C₀) | 45 kN |
| Weight | 1340 g |
| Max speed (grease) | 8,000 rpm |
| Max speed (oil) | 12,000 rpm |
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
Heavy-duty electric motorsIndustrial pumpsConveyor systemsMining equipmentConstruction machineryAgricultural equipmentHeavy gearboxesCompressorsPaper and steel millsVibrating screensLarge electric motors (50+ HP)Industrial gearboxesHeavy-duty conveyor systemsMining and construction equipmentPaper mill machinerySteel rolling millsLarge compressorsWind turbine components
Heavy industryMiningConstructionPaper & pulpSteel
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 6311 | Open (No Seal) | CN |
| 6311 C3 | Open (No Seal) | C3 |
| 6311-2Z | ZZ | CN |
| 6311-2Z C3 | ZZ | C3 |
| 6311-2RS1 | 2RS | CN |
| 6311-2RS1 C3 | 2RS | C3 |