| Domestic and foreign models | |||
| New domestic models | W638/8-2Z | ||
| Domestic old models | - | ||
| Main dimensions | |||
| Bore size（d） | 8 | mm | |
| External diameter（D） | 16 | mm | |
| Thickness（B） | 4 | mm | |
| Basic rated load | |||
| Live load（Cr） | 1.06 | KN | |
| Static load（Cor） | 0.71 | KN | |
| Ultimate speed | |||
| Grease | 42000 | rpm | |
| Oil lubrication | 50000 | rpm | |
| Weight | |||
| Weight | 3.2 | kg | |
| Bearing type | |||
| Type | Deep Groove Ball Bearing | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.