30307 J2/Q
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.
Timken3030735 × 80 × 22.75mm
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$34.31
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Specifications
| Bore diameter (d) | 35 mm |
| Outer diameter (D) | 80 mm |
| Width (B) | 22.75 mm |
| Dynamic load rating (C) | 39.8 kN |
| Static load rating (C₀) | 23.4 kN |
| Weight | 341 g |
| Max speed (grease) | 5,400 rpm |
| Max speed (oil) | 7,200 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
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 (35mm bore) — Typical Uses
- Industrial electric motors (10-50 HP)
- Gearboxes and speed reducers
- Heavy-duty pumps
- Conveyor systems
- Machine tool spindles
- Automotive wheel hubs
- Centrifugal fans
- Compressors
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 30307 J2/Q C3 | Open (No Seal) | C3 |