51204
Double direction thrust ball bearings for axial loads in both directions. Used where bidirectional axial loads must be supported.
SKF5120420 × 40 × 17mm
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$11.23
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Specifications
| Bore diameter (d) | 20 mm |
| Outer diameter (D) | 40 mm |
| Width (B) | 17 mm |
| Dynamic load rating (C) | 8.4 kN |
| Static load rating (C₀) | 18.6 kN |
| Weight | 58 g |
| Max speed (grease) | 5,695 rpm |
| Max speed (oil) | 7,225 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
| Brand | Part Number | Seal | Clearance | Status |
|---|---|---|---|---|
| SKF | 51204 | Open | CN | Current |
| FAG | 51204 | Open | CN | Current |
| NSK | 51204 | Open | CN | Current |
| NTN | 51204 | Open | CN | Current |
| Timken | 51204 | Open | CN | Current |
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
Double Direction Thrust — Common Applications
- Machine tool spindles (bidirectional)
- Hydraulic cylinders
- Vertical shaft assemblies
- Precision positioning equipment
- Screw drives
- Heavy machinery pivots
- Industrial gearboxes
Machine toolsHydraulicsHeavy industryPrecision engineering
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