| Domestic and foreign models | |||
| New domestic models | 21308C | ||
| Domestic old models | - | ||
| Main dimensions | |||
| Bore size（d） | 40 | mm | |
| External diameter（D） | 90 | mm | |
| Thickness（B） | 23 | mm | |
| Basic rated load | |||
| Live load（Cr） | 83.5 | KN | |
| Static load（Cor） | 90.6 | KN | |
| Ultimate speed | |||
| Grease | 4500 | rpm | |
| Oil lubrication | 6100 | rpm | |
| Weight | |||
| Weight | 0.71 | kg | |
| Bearing type | |||
| Type | Spherical Roller Bearings | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.