| Domestic and foreign models | |||
| New domestic models | NA4904 | ||
| Domestic old models | 4544904 | ||
| Dimensions | |||
| Inside diameter（d） | 20 | mm | |
| Outside diameter（D） | 37 | mm | |
| Thickness（B） | 17 | mm | |
| Basic Load Rating | |||
| Dynamic load（Cr） | 15.9 | KN | |
| Static load（Cor） | 21.1 | KN | |
| Limiting Speeds | |||
| Grease | 18000 | rpm | |
| Oil | - | rpm | |
| Weight | |||
| Weight | 0.081 | kg | |
| BEARING TYPE | |||
| Type | Needle bearing | ||
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