HK4512
Drawn cup needle roller bearings with no inner ring. Extremely compact radial envelope with high load capacity per unit volume. Shaft acts as inner raceway (must be hardened and ground).
SKFHK 151215 × 21 × 12mm
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$10.84
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Specifications
| Bore diameter (d) | 15 mm |
| Outer diameter (D) | 21 mm |
| Width (B) | 12 mm |
| Dynamic load rating (C) | 7.5 kN |
| Static load rating (C₀) | 9.1 kN |
| Weight | 11 g |
| Max speed (grease) | 11,000 rpm |
| Max speed (oil) | — |
Equivalents Across Brands
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
Connecting rodsRocker armsPump gearsTextile machineryPower tool gearboxesCompressor pistonsPrinting press rollersSmall electric motors (fractional HP)Fans and blowersPower tools (drills, grinders)Office equipment (printers, copiers)Household appliancesSkateboards and roller skatesRC vehicles and hobby motors
AutomotiveMachineryTextilePrinting