Below are common imperial washer dimensions
| Imperial T3 Light Washers | Imperial T3 Heavy Washers | |||||
| I/D “ | O/D “ | Thickness “ | I/D “ | O/D “ | Thickness “ | |
| 1/8 | 5/16 | 1/32 | 1/4 | 0.55″ | 0.06″ | |
| 3/16 | 25/34 | 1/32 | 5/16 | 0.62″ | 0.08″ | |
| 1/4 | 9/16 | 3/64 | 3/8 | 0.75″ | 0.07″ | |
| 5/16 | 5/8 | 3/64 | 7/16 | 0.86″ | 0.09″ | |
| 3/8 | 3/4 | 3/64 | 1/2 | 0.99″ | 0.09″ | |
| 7/16 | 7/8 | 1/32 | 9/16 | 1.12″ | 0.09″ | |
| 1/2 | 1 | 1 1/6 | 5/8 | 1.24″ | 0.11″ | |
| 9/16 | 1 1/8 | 1/32 | 3/4 | 1.50″ | 0.12″ | |
| 5/8 | 1 1/4 | 5/64 | 1 | 1.87″ | 0.16″ | |
| 3/4 | 1 1/2 | 5/64 | ||||
| 1 | 1 7/8 | 5/64 | ||||
| Imperial T4 Heavy Washers | Imperial T4 Light Washers | |||||
| I/D “ | O/D “ | Thickness “ | I/D “ | O/D “ | Thickness “ | |
| 3/16 | 1/2 | 1/16 | 3/16″ | 0.49″ | 0.04″ | |
| 1/4 | 5/8 | 1/16 | 1/4″ | 0.62″ | 0.04″ | |
| 5/16 | 3/4 | 5/64 | 5/16″ | 0.75″ | 0.05″ | |
| 3/8 | 7/8 | 1/16 | 3/8″ | 0.87″ | 0.05″ | |
| 7/16 | 1 | 3/32 | 7/16″ | 1″ | 0.05″ | |
| 1/2 | 1 1/8 | 3/32 | 1/2″ | 1.12″ | 0.05″ | |
| 5/8 | 1 3/8 | 1/8 | 5/8″ | 1.36″ | 0.07″ | |
| 3/4″ | 1.62″ | 0.07″ | ||||
| 1″ | 2.10″ | 0.09″ | ||||
