| Domestic and foreign models | |||
| New domestic models | 61904-2RZ | ||
| Domestic old models | 1180904K | ||
| Main dimensions | |||
| Bore size（d） | 20 | mm | |
| External diameter（D） | 37 | mm | |
| Thickness（B） | 9 | mm | |
| Basic rated load | |||
| Live load（Cr） | 6.4 | KN | |
| Static load（Cor） | 3.7 | KN | |
| Ultimate speed | |||
| Grease | 17000 | rpm | |
| Oil lubrication | 22000 | rpm | |
| Weight | |||
| Weight | 0.031 | kg | |
| Bearing type | |||
| Type | Deep Groove Ball Bearing | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.