| Inner Diameter | 4 mm |
| Outer Diameter | 8 mm |
| Thickness | 2 mm |
| Model | W604-2Z, W617/4, W617/4X |
| Lubrication | Grease or Oil |
| Origin | China |
High-performance miniature deep groove ball bearings with rich stock, 100% on-time delivery, and OEM/ODM support. Suitable for precision applications requiring low vibration (Z1V1–Z3V3) and reliable grease/oil lubrication.