Because the calculations specified in the torque chart below are offered as a guide only, it is the sole responsibility of any person using them to assume all risk. There are many variables affecting the torque-tension relationship, such as human error, surface texture, and lubrication. Because of these existing variables, the only way to determine the correct torque is through experimentation under actual joint and assembly conditions.
| Bolt Size | TPI | Tension | Tightening Torque Range (ft lbs) (Min - Max) | ||
|---|---|---|---|---|---|
| Min | Max | Galv+Waxed | Plain | ||
| 1⁄2 | 13 | 12,000 | 14,000 | 50 - 58 | 100 - 117 |
| 5⁄8 | 11 | 19,000 | 23,000 | 99 - 120 | 198 - 240 |
| 3⁄4 | 10 | 28,000 | 34,000 | 175 - 213 | 350 - 425 |
| 7⁄8 | 9 | 39,000 | 47,000 | 284 - 343 | 569 - 685 |
| 1 | 8 | 51,000 | 61,000 | 425 - 508 | 850 - 1,017 |
| 11⁄8 | 7 | 64,000 | 77,000 | 600 - 722 | 1,200 - 1,444 |
| 11⁄4 | 7 | 81,000 | 98,000 | 844 - 1,021 | 1,687 - 2,042 |
| 13⁄8 | 6 | 97,000 | 117,000 | 1,111 - 1,341 | 2,223 - 2,681 |
| 11⁄2 | 6 | 118,000 | 143,000 | 1,475 - 1,788 | 2,950 - 3,575 |