UCF204
Heavy-duty 4-bolt square flange bearing units for rigid mounting on flat surfaces. Higher load capacity and rigidity than 2-bolt flange units.
SKFUCF 20420 × 108 × 78mm
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$23.40
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Specifications
| Bore diameter (d) | 20 mm |
| Outer diameter (D) | 108 mm |
| Width (B) | 78 mm |
| Dynamic load rating (C) | 12.7 kN |
| Static load rating (C₀) | 6.55 kN |
| Weight | 740 g |
| Max speed (grease) | 4,500 rpm |
| Max speed (oil) | — |
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 | UCF 204 | Open | CN | Verified |
| FAG | UCF204 | Open | CN | Current |
| NSK | UCF204 | Open | CN | Current |
| NTN | UCF204 | Open | CN | Current |
| Timken | UCF204 | 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
4-Bolt Square Flange Units — Common Applications
- Heavy conveyor systems
- Industrial fans and blowers
- Mixer and agitator drives
- Screw conveyors
- Heavy-duty material handling
- Agricultural machinery
Heavy industryAgricultureMiningFood processing
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
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| UCF 204 | Open (No Seal) | CN |