| Domestic and foreign models | |||
| New domestic models | N311/Z2 | ||
| Domestic old models | - | ||
| Main dimensions | |||
| Bore size（d） | 55 | mm | |
| External diameter（D） | 120 | mm | |
| Thickness（B） | 29 | mm | |
| Basic rated load | |||
| Live load（Cr） | KN | ||
| Static load（Cor） | KN | ||
| Ultimate speed | |||
| Grease | rpm | ||
| Oil lubrication | rpm | ||
| Weight | |||
| Weight | 1.74 | kg | |
| Bearing type | |||
| Type | Self-aligning ball bearing | ||
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Shandong Ruidefu Transmission Equipment Co., Ltd.