30308D
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.
Timken3030840 × 90 × 25.25mm
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$36.96
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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 |
Equivalents Across Brands
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| Timken | 30308 | Open | CN | Probable |
| SKF | 30308 J2/Q | Open | CN | Probable |
| NTN | 4T-30308 | Open | CN | Probable |
| FAG | 30308-XL | Open | CN | Probable |
| NSK | HR30308J | Open | CN | Probable |
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 wheel hubs (trucks, trailers)Industrial gearboxesCrane and hoist equipmentMining conveyorsPaper mill equipmentLarge pumps and compressorsRolling mill equipmentIndustrial electric motors (10-50 HP)Gearboxes and speed reducersHeavy-duty pumpsConveyor systemsMachine tool spindlesAutomotive wheel hubsCentrifugal fansCompressors
TruckingMiningPaper & pulpHeavy industry
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 30308 J2/Q | Open (No Seal) | CN |
| 30308 J2/Q C3 | Open (No Seal) | C3 |