Bolt Size |
TPI |
Proof Load (lbs) |
Clamp Load (lbs) |
Tightening Torque (ft lbs) |
|||
Waxed |
Zinc |
Plain |
Teflon |
||||
| 1⁄4 | 20 | 3,350 | 2,513 | 7.9 | 8.9 | 10.5 | 3.9 |
| 5/16 | 18 | 5,500 | 4,125 | 16.1 | 18.3 | 21.5 | 8.1 |
| 3/8 | 16 | 8,150 | 6,113 | 28.7 | 32.5 | 38.2 | 14.3 |
| 7/16 | 14 | 11,150 | 8,363 | 45.7 | 51.8 | 61 | 22.9 |
| 1⁄2 | 13 | 14,900 | 11,175 | 69.8 | 79.2 | 93.1 | 34.9 |
| 9/16 | 12 | 19,100 | 14,325 | 100.7 | 114.2 | 134.3 | 50.4 |
| 5/8 | 11 | 23,750 | 17,813 | 139.2 | 157.7 | 185.5 | 69.6 |
| 3⁄4 | 10 | 35,050 | 26,288 | 246.4 | 279.3 | 328.6 | 123.2 |
| 7/8 | 9 | 48,500 | 36,375 | 397.9 | 450.9 | 530.5 | 198.9 |
| 1 | 8 | 63,650 | 47,738 | 596.7 | 676.3 | 795.6 | 298.4 |
| 1 1/8 | 7 | 80,100 | 60,075 | 844.8 | 957 | 1,126 | 422.4 |
| 1 1⁄4 | 7 | 101,750 | 76,313 | 1192.4 | 1,351 | 1,590 | 596.2 |
| 1 3/8 | 6 | 121,300 | 90,975 | 1,564 | 1,772 | 2,085 | 781.8 |
| 1 1⁄2 | 6 | 147,550 | 110,663 | 2,075 | 2,352 | 2,767 | 1037.5 |
| 1 3⁄4 | 5 | 199,500 | 149,625 | 3,273 | 3,709 | 4,364 | 1636.5 |
| 2 | 4 1⁄2 | 262,500 | 196,875 | 4,922 | 5,578 | 6,563 | 2460.9 |
| 2 1⁄4 | 4 1⁄2 | 341,250 | 255,938 | 7,198 | 8,158 | 9,598 | 3599.1 |
| 2 1⁄2 | 4 | 420,000 | 315,000 | 9,844 | 11,156 | 13,125 | 4921.9 |
| 2 3⁄4 | 4 | 468,500 | 351,375 | 12,079 | 13,689 | 16,105 | 6039.3 |
| 3 | 4 | 567,150 | 425,363 | 15,951 | 18,078 | 21,268 | 7975.5 |
| 3 1⁄4 | 4 | 674,500 | 505,875 | 20,551 | 23,291 | 27,402 | 10275.6 |
| 3 1⁄2 | 4 | 791,350 | 593,513 | 25,966 | 29,428 | 34,622 | 12983.1 |
| 3 3⁄4 | 4 | 917,700 | 688,275 | 32,263 | 36,565 | 43,017 | 16131.4 |
| 4 | 4 | 1,052,600 | 789,450 | 39,473 | 44,736 | 52,630 | 19736.3 |