30308-J2-Q-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.
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Match Details
The specifications and details for why this match is correct.
Specifications
| Bore diameter (d) | 40 mm |
| Outer diameter (D) | 90 mm |
| Width (B) | 25.25 mm |
| Dynamic load rating (C) | 49.2 kN |
| Static load rating (C₀) | 29.1 kN |
| Weight | 484 g |
| Max speed (grease) | 4,800 rpm |
| Max speed (oil) | 6,000 rpm |
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Cross-References
Every way this part is identified across brands and catalogs.
Tier-1 Brand Equivalents
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| FAG | 30308-XL C3 | Open | C3 | Probable |
| NSK | HR30308J C3 | Open | C3 | Probable |
| NTN | 4T-30308 C3 | Open | C3 | Probable |
| SKF | 30308 J2/Q C3 | Open | C3 | Probable |
| Timken | 30308 C3 | Open | C3 | Probable |
Legacy & Proprietary Numbers
Technical Details & Applications
Specification variations and common equipment types.
Internal Clearance
Increased radial internal clearance. Required when bearings operate at elevated temperatures or with tight shaft fits.
Seal Type
No seals or shields. Allows external lubrication and cooling. Lowest friction, highest speed capability.
- Machine tool spindles
- Gearboxes with oil bath lubrication
- High-speed precision equipment
Where This Bearing Is Used
Alternative Parts
Options if this exact part isn't what you need.
Same Geometry, Different Configuration
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 30308 J2/Q | Open (No Seal) | CN |
| 30308 J2/Q C3 | Open (No Seal) | C3 |
Related Bearings
Adjacent sizes and cross-series bearings from our catalog.