30311-C3
Medium series tapered roller bearings with higher load capacity than 302xx for the same bore size. Used where heavier loads demand a more robust bearing cross-section.
FAG30311-XL C3
Pricing not yet available for this part.
Geometry100%
55 × 120 × 25mm
Sealing100%
Open (no seal)
Load rating100%
Cr 68.5 kN / C₀r 43 kN
Speed100%
3,360 rpm (grease)
Specifications
| Bore diameter (d) | 55 mm |
| Outer diameter (D) | 120 mm |
| Width (B) | 25 mm |
| Dynamic load rating (C) | 68.5 kN |
| Static load rating (C₀) | 43 kN |
| Weight | 890 g |
| Max speed (grease) | 3,360 rpm |
| Max speed (oil) | 4,500 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 |
|---|---|---|---|---|
| FAG | 30311-XL C3 | Open | C3 | Verified |
| NSK | HR30311J C3 | Open | C3 | Verified |
| NTN | 4T-30311 C3 | Open | C3 | Verified |
| SKF | 30311 J2/Q C3 | Open | C3 | Verified |
| Timken | 30311 C3 | Open | C3 | Verified |
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
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 wheel hubs (trucks, trailers)Industrial gearboxesCrane and hoist equipmentMining conveyorsPaper mill equipmentLarge pumps and compressorsRolling mill equipmentLarge electric motors (50+ HP)Heavy-duty conveyor systemsMining and construction equipmentPaper mill machinerySteel rolling millsLarge compressorsWind turbine components
TruckingMiningPaper & pulpHeavy industry
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 30311 J2/Q | Open (No Seal) | CN |
| 30311 J2/Q C3 | Open (No Seal) | C3 |