ASTM A354-BD / SAE GRADE 8*
| Bolt Size | TPI | Proof Load (lbs) 1 | Clamp Load (lbs) 2 | Tightening Torque (ft lbs) | |
|---|---|---|---|---|---|
| Plain | Lubricated | ||||
| 1⁄4 | 20 | 3,800 | 2,850 | 12 | 6 |
| 5⁄16 | 18 | 6,300 | 4,725 | 25 | 12 |
| 3⁄8 | 16 | 9,300 | 6,975 | 44 | 22 |
| 7⁄16 | 14 | 12,750 | 9,563 | 70 | 35 |
| 1⁄2 | 13 | 17,050 | 12,788 | 107 | 53 |
| 9⁄16 | 12 | 21,850 | 16,388 | 154 | 77 |
| 5⁄8 | 11 | 27,100 | 20,325 | 212 | 106 |
| 3⁄4 | 10 | 40,100 | 30,075 | 376 | 188 |
| 7⁄8 | 9 | 55,450 | 41,588 | 606 | 303 |
| 1 | 8 | 72,700 | 54,525 | 909 | 454 |
| 11⁄8 | 7 | 91,550 | 68,663 | 1,287 | 644 |
| 11⁄4 | 7 | 120,000 | 90,000 | 1,875 | 938 |
| 13⁄8 | 6 | 138,600 | 103,950 | 2,382 | 1,191 |
| 11⁄2 | 6 | 168,600 | 126,450 | 3,161 | 1,581 |
| 13⁄4 | 5 | 228,000 | 171,000 | 4,988 | 2,494 |
| 2 | 41⁄2 | 300,000 | 225,000 | 7,500 | 3,750 |
| 21⁄4 | 41⁄2 | 390,000 | 292,500 | 10,969 | 5,484 |
| 21⁄2 | 4 | 480,000 | 360,000 | 15,000 | 7,500 |
| 23⁄4 | 4 | 517,650 | 388,238 | 17,794 | 8,897 |
| 3 | 4 | 626,850 | 470,138 | 23,507 | 11,753 |
| 31⁄4 | 4 | 745,500 | 559,125 | 30,286 | 15,143 |
| 31⁄2 | 4 | 874,650 | 655,988 | 38,266 | 19,133 |
| 33⁄4 | 4 | 1,014,300 | 760,725 | 47,545 | 23,773 |
| 4 | 4 | 1,163,400 | 872,550 | 58,100 | 29,085 |
| * SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter. | |||||