Hex Head Machine Bolt
Hex Head Machine Bolt
Hex head machine bolts are used for fastening pole line hardware and line construction specialty products to crossarm poles and other structures as well as attaching the wooden crossarms to the pole. Hex head machine bolts have an added semi-cone point and a thread length unique to pole line fasteners depending on the length of the bolts. Hex head machine bolts also have a hex nut assembled.
| Bolt Diameter | D | F | C | H | |||||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Width Across Flats | Width Across Corners | Height | ||||||
| Max | Basic | Max | Min | Max | Min | Basic | Max | Min | |
| 1⁄2 | 0.515 | 3⁄4 | 0.750 | 0.725 | 0.866 | 0.826 | 11⁄32 | 0.364 | 0.302 |
| 5⁄8 | 0.642 | 15⁄16 | 0.938 | 0.906 | 1.083 | 1.033 | 27⁄64 | 0.444 | 0.378 |
| 3⁄4 | 0.768 | 11⁄8 | 1.125 | 1.088 | 1.299 | 1.240 | 1⁄2 | 0.524 | 0.455 |
| 7⁄8 | 0.895 | 15⁄16 | 1.312 | 1.269 | 1.516 | 1.447 | 37⁄64 | 0.604 | 0.531 |
| 1 | 1.022 | 11⁄2 | 1.500 | 1.450 | 1.732 | 1.653 | 43⁄64 | 0.700 | 0.591 |
| 11⁄8 | 1.149 | 111⁄16 | 1.688 | 1.631 | 1.949 | 1.859 | 3⁄4 | 0.780 | 0.658 |
| 11⁄4 | 1.277 | 17⁄8 | 1.875 | 1.812 | 2.165 | 2.066 | 27⁄32 | 0.876 | 0.749 |
| 13⁄8 | 1.404 | 21⁄16 | 2.062 | 1.994 | 2.382 | 2.273 | 29⁄32 | 0.940 | 0.810 |
| 11⁄2 | 1.531 | 21⁄4 | 2.250 | 2.175 | 2.598 | 2.480 | 1 | 1.036 | 0.902 |
| 15⁄8 | 1.658 | 27⁄16 | 2.438 | 2.356 | 2.815 | 2.616 | 13⁄32 | 1.116 | 0.978 |
| 13⁄4 | 1.785 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 15⁄32 | 1.196 | 1.054 |
| 17⁄8 | 1.912 | 213⁄16 | 2.812 | 2.719 | 3.248 | 3.099 | 11⁄4 | 1.276 | 1.130 |
| 2 | 2.039 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 111⁄32 | 1.388 | 1.175 |
| 21⁄4 | 2.305 | 33⁄8 | 3.375 | 3.262 | 3.897 | 3.719 | 11⁄2 | 1.548 | 1.327 |
| 21⁄2 | 2.559 | 33⁄4 | 3.750 | 3.625 | 4.330 | 4.133 | 121⁄32 | 1.708 | 1.479 |
| Dimensions per ASME B18.2.1 | |||||||||
Standard Thread Lengths
| *Bolts shorter and/or smaller than those listed in the table shall have minimum thread lengths in accordance with American National Standard for Square and Hex Bolts and Screws, B18.2.1* | ||
| Diameters | Bolt length | Thread length |
|---|---|---|
| 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″ | 4″ up to less than 8″ | 3″ |
| 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/4″ | 8″ up to less than 12″ | 4″ |
| 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/4″ | 12″ and over | 6″ |
