US Hex Bolts - Inches
ANSI/ASME B18.2.1 Dimensions of Hex Bolts - Imperial units.
| Nominal Size (in) | Outside Diameter (in) | Width Across Flats (in) | |
|---|---|---|---|
| max | min | ||
| 5/16 | 0.324 | 0.298 | 1/2 |
| 3/8 | 0.388 | 0.360 | 9/16 |
| 7/16 | 0.452 | 0.421 | 5/8 |
| 1/2 | 0.515 | 0.482 | 3/4 |
| 5/8 | 0.642 | 0.605 | 15/16 |
| 3/4 | 0.768 | 0.729 | 1 1/8 |
| 7/8 | 0.895 | 0.852 | 1 5/16 |
| 1 | 1.022 | 0.976 | 1 1/2 |
| 1 1/8 | 1.149 | 1.098 | 1 11/16 |
| 1 1/4 | 1.277 | 1.223 | 1 7/8 |
| 1 3/8 | 1.404 | 1.345 | 2 1/16 |
| 1 1/2 | 1.531 | 1.470 | 2 1/4 |
| 1 5/8 | 1.658 | 1.591 | 2 7/16 |
| 1 3/4 | 1.785 | 1.716 | 2 5/8 |
| 1 7/8 | 1.912 | 1.839 | 2 13/16 |
| 2 | 2.039 | 1.964 | 3 |
| 2 1/4 | 2.305 | 2.214 | 3 3/8 |
| 2 1/2 | 2.559 | 2.461 | 3 3/4 |
| 2 3/4 | 2.827 | 2.711 | 4 1/8 |
| 3 | 3.081 | 2.961 | 4 1/2 |
| 3 1/4 | 3.335 | 3.210 | 4 7/8 |
| 3 1/2 | 3.589 | 3.461 | 5 1/4 |
| 3 3/4 | 3.858 | 3.726 | 5 5/8 |
| 4 | 4.111 | 3.975 | 6 |
ASME B18.2.1 Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)
