W637/4X-2Z SKF 4x8x3mm Reference speed 150000 r/min Deep groove ball bearings
| Bearing number | W637/4X-2Z |
| Size (mm) | 4x8x3 |
| Brand | SKF |
| Bore Diameter (mm) | 4 |
| Outer Diameter (mm) | 8 |
| Width (mm) | 3 |
| d | 4 mm |
| D | 8 mm |
| B | 3 mm |
| C | 3 mm |
| d1 | 5 mm |
| d2 | – mm |
| r1 min. | 4.8 mm |
| r2 min. | 4.8 mm |
| D1 | 7.4 mm |
| D2 | 0.1 mm |
| da min. | 4.9 mm |
| Da max. | 7.5 mm |
| ra max. | 0.1 mm |
| Weight | 0.0005 Kg |
| Basic dynamic load rating (C) | 0.225 kN |
| Basic static load rating (C0) | 0.072 kN |
| Fatigue load limit (Pu) | 0.003 |
| Reference speed | 150000 r/min |
| Limiting speed | 75000 r/min |
| Calculation factor (f0) | 7.2 |
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Detailed Parameters
parameter：
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