HOME > TYPES > BOLT TYPES
Square Head Bolt
Bolts with a square shaped head rather than the standard hexagonal shape. This creates a larger bearing surface for wrenching.
Dimensions
ASME B18.2.1
| Thread Dia. | Across Flats | Thread Length | Thread Length > 6" |
|---|---|---|---|
| 1/4 | 0.362 - 0.375 | 3/4 | 1 |
| 5/16 | 0.484 - 0.500 | 7/8 | 1 1/8 |
| 3/8 | 0.544 - 0.562 | 1 | 1 1/4 |
| 7/16 | 0.603 - 0.625 | 1 1/8 | 1 3/8 |
| 1/2 | 0.725 - 0.750 | 1 1/4 | 1 1/2 |
| 5/8 | 0.906 - 0.938 | 1 1/2 | 1 3/4 |
| 3/4 | 1.088 - 1.125 | 1 3/4 | 2 |
| 7/8 | 1.269 - 1.312 | 2 | 2 1/4 |
| 1 | 1.450 - 1.500 | 2 1/4 | 2 1/2 |
| 1 1/8 | 1.631 - 1.688 | 2 1/2 | 2 3/4 |
| 1 1/4 | 1.812 - 1.875 | 2 3/4 | 3 |
| 1 3/8 | 1.994 - 2.062 | 3 | 3 1/4 |
| 1 1/2 | 2.175 - 2.250 | 3 1/4 | 3 1/2 |