| Domestic and foreign models | |||
| New domestic models | 6404N | ||
| Domestic old models | 50404 | ||
| Main dimensions | |||
| Bore size（d） | 20 | mm | |
| External diameter（D） | 72 | mm | |
| Thickness（B） | 19 | mm | |
| Basic rated load | |||
| Live load（Cr） | 31 | KN | |
| Static load（Cor） | 15.2 | KN | |
| Ultimate speed | |||
| Grease | 9500 | rpm | |
| Oil lubrication | 13000 | rpm | |
| Weight | |||
| Weight | 0.4 | kg | |
| Bearing type | |||
| Type | Deep Groove Ball Bearing | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.