| Inside Diameter | 4mm |
| Outside Diameter | 9mm |
| Race Width | 4mm |
| Ball Bearing Type | Single Row Deep Groove Ball Bearing |
| Sealing Arrangement | Both Sides Shielded |
| Bearing Clearance | CN |
| Material | Steel |
| Ball Material | Steel |
| Cage Material | Sheet Metal |
| Number of Rows | 1 |
| Static Load Rating | 116kN |
| Dynamic Load Rating | 423N |
| Bore Type | Parallel |
| Bearing Series | 3 Medium |
| Partial Bearing Code | 638/4 |
| Model Number p | 638/42Z |
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