| Domestic and foreign models | |||
| New domestic models | F638/4-2Z | ||
| Domestic old models | - | ||
| Dimensions | |||
| Inside diameter（d） | 4 | mm | |
| Outside diameter（D） | 9 | mm | |
| Thickness（B） | 4 | mm | |
| Basic Load Rating | |||
| Dynamic load（Cr） | - | KN | |
| Static load（Cor） | - | KN | |
| Limiting Speeds | |||
| Grease | - | rpm | |
| Oil | - | rpm | |
| Weight | |||
| Weight | 0.001 | kg | |
| BEARING TYPE | |||
| Type | Deep groove ball bearings | ||
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