| Domestic and foreign models | |||
| New domestic models | WF638/4-2Z | ||
| Domestic old models | - | ||
| Main dimensions | |||
| Bore size（d） | 4 | mm | |
| External diameter（D） | 9 | mm | |
| Thickness（B） | 4 | mm | |
| Basic rated load | |||
| Live load（Cr） | 0.64 | KN | |
| Static load（Cor） | 0.23 | KN | |
| Ultimate speed | |||
| Grease | 59000 | rpm | |
| Oil lubrication | 70000 | rpm | |
| Weight | |||
| Weight | 0.7 | kg | |
| Bearing type | |||
| Type | Deep Groove Ball Bearing | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.