Metric
(ISO 7089 / DIN 125)
| Size | ID (mm) | OD (mm) | Thickness (mm) |
|---|---|---|---|
| M3 | 3.2 | 7.0 | 0.5 |
| M4 | 4.3 | 9.0 | 0.8 |
| M5 | 5.3 | 10.0 | 1.0 |
| M6 | 6.4 | 12.0 | 1.6 |
| M8 | 8.4 | 16.0 | 1.6 |
| M10 | 10.5 | 20.0 | 2.0 |
| M12 | 13.0 | 24.0 | 2.5 |
| M16 | 17.0 | 30.0 | 3.0 |
| M20 | 21.0 | 37.0 | 3.0 |
Imperial
ASME B18.21.1 - Type A Plain Washers (Narrow)
| Size | ID (in) | OD (in) | Thickness (in) |
|---|---|---|---|
| #4 | 0.125 | 0.312 | 0.032 |
| #6 | 0.156 | 0.375 | 0.049 |
| #8 | 0.188 | 0.438 | 0.049 |
| #10 | 0.219 | 0.500 | 0.049 |
| 1/4" | 0.281 | 0.625 | 0.065 |
| 5/16" | 0.344 | 0.750 | 0.065 |
| 3/8" | 0.406 | 0.875 | 0.065 |
| 1/2" | 0.531 | 1.062 | 0.095 |