30303
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.
Timken3030420 × 52 × 16.25mm
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$18.41
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Specifications
| Bore diameter (d) | 20 mm |
| Outer diameter (D) | 52 mm |
| Width (B) | 16.25 mm |
| Dynamic load rating (C) | 19.1 kN |
| Static load rating (C₀) | 11.4 kN |
| Weight | 98 g |
| Max speed (grease) | 8,400 rpm |
| Max speed (oil) | — |
Equivalents Across Brands
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| Timken | 30304 | Open | CN | Probable |
| SKF | 30304 J2/Q | Open | CN | Probable |
| FAG | 30304-XL | Open | CN | Probable |
| NSK | HR30304J | Open | CN | Probable |
| NTN | 4T-30304 | Open | CN | Probable |
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
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
Where This Bearing Is Used
Tapered Roller — Medium, Narrow — Common Applications
- Heavy-duty wheel hubs (trucks, trailers)
- Industrial gearboxes
- Crane and hoist equipment
- Mining conveyors
- Paper mill equipment
- Large pumps and compressors
- Rolling mill equipment
TruckingMiningPaper & pulpHeavy industry
Medium-Small (20mm bore) — Typical Uses
- General-purpose electric motors (1-10 HP)
- Pumps and compressors
- Automotive alternators and A/C compressors
- Conveyor rollers
- Agricultural machinery
- Washing machines
- Industrial fans
- Printing presses