3984
NTN4T-3984/392066.67 × 112.71 × 30.16mm
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$74.33
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Specifications
| Bore diameter (d) | 66.67 mm |
| Outer diameter (D) | 112.71 mm |
| Width (B) | 30.16 mm |
| Dynamic load rating (C) | 65 kN |
| Static load rating (C₀) | 42 kN |
| Weight | 620 g |
| Max speed (grease) | 3,000 rpm |
| Max speed (oil) | 4,500 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 |
|---|---|---|---|---|
| NTN | 4T-3984/3920 | Open | CN | Equivalent |
| Koyo | 3984/3920 | Open | CN | Equivalent |
| Timken | 3984/3920 | Open | CN | Probable |
| FAG | 3920 | Open | CN | Probable |
| FAG | 3984 | Open | CN | Current |
| FAG | 3984/3920 | Open | CN | Probable |
| Koyo | 3920 | Open | CN | Equivalent |
| Koyo | 3984 | Open | CN | Current |
| NTN | 3920 | Open | CN | Equivalent |
| NTN | 3984 | Open | CN | Current |
| SKF | 3920 | Open | CN | Equivalent |
| SKF | 3984 | Open | CN | Current |
| SKF | 3984/3920 | Open | CN | Equivalent |
| Timken | 3920 | Open | CN | Probable |
| Timken | 3984 | 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
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 3984/3920 | Open (No Seal) | CN |