How much space do you need for a bolt if you are using a flat washer? How long do your threads need to be if you are accounting for the thickness of a washer. Flat washer dimensions are frequently important while working on mechanical designs. While there are many size options available, here is a table for the most common flat washer dimensions.
| Bolt Size | A | B | C | Weight In Pounds Per 100 Pieces |
|---|---|---|---|---|
| Inside Diameter | Outside Diameter | Thickness | ||
| 3/8 | 7/16 | 1 | 0.083 | 2 |
| 1/2 | 9/16 | 1-3/8 | 0.109 | 4 |
| 5/8 | 11/16 | 1-3/4 | 0.134 | 8 |
| 3/4 | 13/16 | 2 | 0.148 | 11 |
| 7/8 | 15/16 | 2-1/4 | 0.165 | 15 |
| 1 | 1-1/16 | 2-1/2 | 0.165 | 19 |
| 1-1/8 | 1-1/4 | 2-3/4 | 0.165 | 22 |
| 1-1/4 | 1-3/8 | 3 | 0.165 | 26 |
| 1-3/8 | 1-1/2 | 3-1/4 | 0.180 | 33 |
| 1-1/2 | 1-5/8 | 3-1/2 | 0.180 | 38 |
| 1-5/8 | 1-3/4 | 3-3/4 | 0.180 | 43 |
| 1-3/4 | 1-7/8 | 4 | 0.180 | 50 |
| 1-7/8 | 2 | 4-1/4 | 0.180 | 57 |
| 2 | 2-1/8 | 4-1/2 | 0.180 | 63 |
| 2-1/4 | 2-3/8 | 4-3/4 | 0.220 | 83 |
| 2-1/2 | 2-5/8 | 5 | 0.238 | 96 |
| 2-3/4 | 2-7/8 | 5-1/4 | 0.259 | 110 |
| 3 | 3-1/8 | 5-1/2 | 0.284 | 130 |