| Inner Diameter | 4 mm |
| Outer Diameter | 11 mm |
| Thickness | 4 mm |
| Model | 618/4, 619/4, 619/4-2Z |
| Lubrication | Grease or Oil |
| Origin | China |
High-performance miniature ball bearings with rich stock, 100% on-time delivery, and fast response (<0.5h). Suitable for OEM/ODM applications. Available with grease or oil lubrication, vibration grades Z1V1–Z3V3, and certified trademarks (NSK, NTN, Timken, etc.).