Bolt Dimension
| BOLT HEAD DIMENSION | |||||||
|---|---|---|---|---|---|---|---|
| Size | Regular Hex Head | Heavy Hex Head | Square Head | ||||
| Bolt Dia. | Width Across Flats | Basic Head Height | Width Across Flats | Basic Head Height | Width Across Flats | Basic Head Height | |
| 1/2 | 3/4 | 11/32 | 7/8 | 11/32 | 3/4 | 21/64 | |
| 5/8 | 15/16 | 27/64 | 1-1/16 | 27/64 | 15/16 | 27/64 | |
| 3/4 | 1-1/8 | 1/2 | 1-1/4 | 1/2 | 1-1/8 | 1/2 | |
| 7/8 | 1-5/16 | 37/64 | 1-7/16 | 37/64 | 1-5/16 | 19/32 | |
| 1 | 1-1/2 | 43/64 | 1-5/8 | 43/64 | 1-1/2 | 21/32 | |
| 1-1/8 | 1-11/16 | 3/4 | 1-13/16 | 3/4 | 1-11/16 | 3/4 | |
| 1-1/4 | 1-7/8 | 27/32 | 2 | 27/32 | 1-7/8 | 37/32 | |
| 1-3/8 | 2-1/16 | 29/32 | 2-3/16 | 29/32 | 2-1/16 | 29/32 | |
| 1-1/2 | 2-1/4 | l | 2-3/8 | 1 | 2-1/4 | 1 | |
| 1-5/8 | 2-7/16 | 1-5/64 | 2-9/16 | 1-5/64 | 2-9/16 | 1-5/64 | |
| 1-3/4 | 2-5/8 | 1-3/32 | 2-3/4 | 1-3/32 | 2-3/4 | 1-3/32 | |
| 1-7/8 | 2-13/16 | 1-15/64 | 2-15/16 | 1-15/64 | 2-15/16 | 1-15/64 | |
| 2 | 3 | 1-11/32 | 3-1/8 | 1-11/32 | 3-1/8 | 1-11/32 | |
| 2-1/4 | 3-3/8 | 1-1/2 | 3-1/2 | 1-1/2 | 3-1/2 | 1-1/2 | |
| 2-1/2 | 3-3/4 | 1-21/32 | 3-7/8 | 1-21/32 | 3-7/8 | 121/32 | |
| 2-3/4 | 4-1/8 | 1-13/16 | 4-1/4 | 1-13/16 | 4-1/4 | 1-13/16 | |
| 3 | 4-1/2 | 2 | 4-5/8 | 2 | 4-5/8 | 2 | |
