| Inner Diameter | 4 mm |
| Outer Diameter | 11 mm |
| Thickness | 4 mm |
| Model | W619/4-2Z, W624-2RS1, W624-2Z |
| Lubrication | Grease or Oil |
| Origin | China |
High-performance miniature deep groove ball bearings with rich stock, 100% on-time delivery, and OEM/ODM support. Precision-engineered for low vibration (Z1V1–Z3V3), sealed with 2Z/2RS1 options, and suitable for compact applications requiring reliability and efficiency.