| Inner Diameter | 9 mm |
| Outer Diameter | 30 mm |
| Thickness | 10 mm |
| Model | W639-2RS1 / W639 / W63801-2RS1 |
| Lubrication | Grease or Oil |
| Origin | China |
High-performance deep groove ball bearing with rich stock, 100% on-time delivery, and OEM/ODM service. Features high-grade grease technology, low vibration (Z1V1–Z3V3), and multiple brand options (NSK, NTN, Timken, etc.). Shipped globally via express, air, sea, and rail.