| Part Number | MR128 |
| System of Measurement | Metric |
| Bearing Type | Ball |
| For Load Direction | Radial |
| Construction | Single Row |
| Seal Type | Open |
| Bore Dia | 8 mm |
| Bore Dia Tolerance | -0.008mm to 0 |
| Outer Dia | 12 mm |
| Outer Dia Tolerance | -0.008mm to 0 |
| Width | 2.5 mm |
| Width Tolerance | -0.12mm to 0 |
| Ring Material | 52100 Chrome Steel |
| Ball Material | 52100 Chrome Steel |
| Cage Material | 300 Series Stainless Steel |
| Dynamic Radial Load | 462 N |
| Static Radial Load | 219 N |
| Max Speed (X1000 rpm) | 40 |
| Lubrication | Required |
| Shaft Mount Type | Press Fit |
| Temperature Range | -30° to 110 °C |
| ABEC Rating | ABEC1 (Available in ABEC3/5/7) |
| Radial Clearance Trade No. | MC3 （Available in MC1/2/4/5/6) |
| Radial Clearance | 0.002mm to 0.013mm |
| RoHS | Compliant |
| REACH | Compliant |
| Ball Dia | 1.2000 mm |
| Ball Qty | 12 |
| Weight | 0.7 g |
