6311ZZ/C3
Higher load capacity than the 6200 series for the same bore size. Used where heavier radial loads are expected.
SKF6311-2Z C355 × 120 × 29mm
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$65.94
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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 |
Why This Match Is Correct
✓Exact dimensional match (bore, OD, width)
✓Load ratings within tolerance
✓Seal type verified via manufacturer tables
✓Speed rating compatible
Equivalents Across Brands
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| SKF | 6311-2Z C3 | ZZ | C3 | Verified |
| FAG | 6311-2ZR-C3 | ZZ | C3 | Probable |
| NSK | 6311ZZ C3E | ZZ | C3 | Verified |
| NTN | 6311ZZ/C3 | ZZ | C3 | Current |
| Timken | 6311-ZZ C3 | ZZ | C3 | Verified |
Seal Type
Metal Shielded (ZZ / 2Z)
Metal shields on both sides. Moderate protection from dust and debris. Pre-lubricated with grease.
Best forModerately clean environments. Applications where some contamination is possible but not severe.
Avoid forHarsh environments with heavy moisture, chemicals, or fine dust ingress.
Examples
- Electric motors
- Fans and blowers
- Power tools
- HVAC equipment
Internal Clearance
Greater Than Normal (C3)
Increased radial internal clearance. Required when bearings operate at elevated temperatures or with tight shaft fits.
Best forHigh-temperature applications. Tight interference fits. Electric motors with frequent starts/stops.
Temperature70-150°C operating temperature
Where This Bearing Is Used
Medium Series — Common Applications
- Heavy-duty electric motors
- Industrial pumps
- Conveyor systems
- Mining equipment
- Construction machinery
- Agricultural equipment
- Heavy gearboxes
- Compressors
- Paper and steel mills
- Vibrating screens
Heavy industryMiningConstructionPaper & pulpSteel
Large (55mm bore) — Typical Uses
- Large electric motors (50+ HP)
- Industrial gearboxes
- Heavy-duty conveyor systems
- Mining and construction equipment
- Paper mill machinery
- Steel rolling mills
- Large compressors
- Wind turbine components
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 |