| d | 4mm | single row, stainless steel, with flanged outer ring |
| D | 9mm | Deep groove ball bearings |
| D3 | 10,3mm | Principal dimensions |
| C | 0,449kN dynamic | Basic load ratings |
| Co | 0,173kN static | static|Basic load ratings |
| Pu | 0,0075kN | limit Fatigue |
| Speed | 140000r/min | Reference Speed ratings |
| Speed | 70000r/min | Limiting Speed ratings |
| Bearing | W 638/4-2ZR | Designations |
| Pu: | 0,0075kN | limit Fatigue |
| C: | 0,449kN dynamic | Basic load ratings |
| Co: | 0,173kN static | static|Basic load ratings |
| Bearing: | W 638/4-2ZR | Designations |
| Speed: | 140000r/min | Reference Speed ratings |
| Speed: | 70000r/min | Limiting Speed ratings |
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