TORQUE ASTM A307
| Bolt Size | TPI | Proof Load (lbs) | Clamp Load (lbs) | Tightening Torque (ft lbs) Galv + Wax | Tightening Torque (ft lbs) Galv | Tightening Torque (ft lbs) Plain |
|---|---|---|---|---|---|---|
| 1/4" | 20 | 1,145 | 859 | 2 | 4 | 4 |
| 5/16" | 18 | 1,886 | 1,415 | 4 | 9 | 7 |
| 3/8" | 16 | 2,790 | 2,093 | 7 | 16 | 13 |
| 7/16" | 14 | 3,827 | 2,870 | 10 | 26 | 21 |
| 1/2" | 13 | 5,108 | 3,831 | 16 | 40 | 32 |
| 9/16" | 12 | 6,552 | 4,914 | 23 | 58 | 46 |
| 5/8" | 11 | 8,136 | 6,102 | 32 | 79 | 64 |
| 3/4" | 10 | 12,024 | 9,018 | 56 | 141 | 113 |
| 7/8" | 9 | 15,200 | 11,400 | 83 | 208 | 166 |
| 1" | 8 | 20,000 | 15,000 | 125 | 313 | 250 |
| 1 1/8" | 7 | 25,200 | 18,900 | 177 | 443 | 354 |
| 1 1/4" | 7 | 32,000 | 24,000 | 250 | 625 | 500 |
| 1 3/8" | 6 | 38,100 | 28,575 | 327 | 819 | 655 |
| 1 1/2" | 6 | 46,400 | 34,800 | 435 | 1,088 | 870 |
| 1 3/4" | 5 | 68,400 | 51,300 | 748 | 1,870 | 1,496 |
| 2" | 4 1/2 | 90,000 | 67,500 | 1,125 | 2,813 | 2,250 |
| 2 1/4" | 4 1/2 | 117,000 | 87,750 | 1,645 | 4,113 | 3,291 |
| 2 1/2" | 4 | 144,000 | 108,000 | 2,250 | 5,625 | 4,500 |
| 2 3/4" | 4 | 177,480 | 133,110 | 3,050 | 7,626 | 6,101 |
| 3" | 4 | 214,920 | 161,190 | 4,030 | 10,074 | 8,060 |
| 3 1/4" | 4 | 255,600 | 191,700 | 5,192 | 12,980 | 10,384 |
| 3 1/2" | 4 | 299,880 | 224,910 | 6,560 | 16,400 | 13,120 |
| 3 3/4" | 4 | 347,760 | 260,820 | 8,151 | 20,377 | 16,301 |
| 4" | 4 | 398,880 | 299,160 | 9,972 | 24,930 | 19,944 |