51218
Double direction thrust ball bearings for axial loads in both directions. Used where bidirectional axial loads must be supported.
Geometry100%
90 × 138 × 37mm
Sealing100%
Open (no seal)
Load rating100%
Cr 49.2 kN / C₀r 122.4 kN
Speed100%
1,615 rpm (grease)
SKF5121890 × 138 × 37mm
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$184.65
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Match Details
The specifications and details for why this match is correct.
Specifications
| Bore diameter (d) | 90 mm |
| Outer diameter (D) | 138 mm |
| Width (B) | 37 mm |
| Dynamic load rating (C) | 49.2 kN |
| Static load rating (C₀) | 122.4 kN |
| Weight | 1206 g |
| Max speed (grease) | 1,615 rpm |
| Max speed (oil) | 2,210 rpm |
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Why This Match Is Correct
✓Exact dimensional match (bore, OD, width)
✓Load ratings within tolerance
✓Seal type verified via manufacturer tables
✓Speed rating compatible
Cross-References
Every way this part is identified across brands and catalogs.
Tier-1 Brand Equivalents
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| SKF | 51218 | Open | CN | Current |
| FAG | 51218 | Open | CN | Current |
| NSK | 51218 | Open | CN | Current |
| NTN | 51218 | Open | CN | Current |
| Timken | 51218 | Open | CN | Current |
Technical Details & Applications
Specification variations and common equipment types.
Internal Clearance
Normal Clearance (CN)
Standard radial internal clearance. Suitable for most applications under normal operating conditions.
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.
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
Electric motorsPumps and compressorsConveyor rollersAgricultural machineryFans and blowersGearboxesPower transmission equipmentWashing machinesPrinting pressesHVACAutomotive alternators and A/C compressors
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