| Inner Diameter | 4 mm |
| Outer Diameter | 16 mm |
| Thickness | 4 mm |
| Model | W627/4-2Z, W627/4 R-2Z, W634 |
| Lubrication | Grease or Oil |
| Origin | China |
High-performance miniature ball bearings with rich stock, 100% on-time delivery, and OEM/ODM support. Suitable for precision instruments requiring low vibration (Z1V1–Z3V3) and high grease technology. Shipped globally via express, air, sea, and more.