| Domestic and foreign models | |||
| New domestic models | HK/21 | ||
| Domestic old models | HK212810 | ||
| Main dimensions | |||
| Bore size（d） | 21 | mm | |
| External diameter（D） | 28 | mm | |
| Thickness（B） | 10 | mm | |
| Basic rated load | |||
| Live load（Cr） | - | KN | |
| Static load（Cor） | - | KN | |
| Ultimate speed | |||
| Grease | - | rpm | |
| Oil lubrication | - | rpm | |
| Weight | |||
| Weight | 0 | kg | |
| Bearing type | |||
| Type | Other unknown types of bearings | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.