Bolt Size |
TPI |
Proof Load (lbs) |
Clamp Load (lbs) |
Tightening Torque (ft lbs) |
||
Lubricated |
Zinc |
Plain |
||||
| 1⁄4 | 20 | 1,150 | 862.5 | 2.7 | 3.1 | 3.6 |
| 5/16 | 18 | 1,880 | 1,410 | 5.5 | 6.2 | 7.3 |
| 3/8 | 16 | 2,790 | 2,093 | 9.8 | 11.1 | 13.1 |
| 7/16 | 14 | 3,825 | 2,869 | 15.7 | 17.8 | 20.9 |
| 1⁄2 | 13 | 5,100 | 3,825 | 23.9 | 27.1 | 31.9 |
| 9/16 | 12 | 6,550 | 4,913 | 34.5 | 39.1 | 46.1 |
| 5/8 | 11 | 8,130 | 6,098 | 47.6 | 54 | 63.5 |
| 3⁄4 | 10 | 12,025 | 9,019 | 84.6 | 95.8 | 112.7 |
| 7/8 | 9 | 15,200 | 11,400 | 124.7 | 141.3 | 166.3 |
| 1 | 8 | 20,000 | 15,000 | 187.5 | 212.5 | 250 |
| 1 1/8 | 7 | 25,200 | 18,900 | 265.8 | 301.2 | 354.4 |
| 1 1⁄4 | 7 | 32,000 | 24,000 | 375 | 425 | 500 |
| 1 3/8 | 6 | 38,000 | 28,500 | 489.8 | 555.2 | 653.1 |
| 1 1⁄2 | 6 | 46,400 | 34,800 | 652.5 | 740 | 870 |
| 1 3⁄4 | 5 | 68,400 | 51,300 | 1122.2 | 1,272 | 1,496 |
| 2 | 4 1⁄2 | 90,000 | 67,500 | 1,688 | 1,913 | 2,250 |
| 2 1⁄4 | 4 1⁄2 | 117,000 | 87,750 | 2,468 | 2,797 | 3,291 |
| 2 1⁄2 | 4 | 144,000 | 108,000 | 3,375 | 3,825 | 4,500 |
| 2 3⁄4 | 4 | 177,500 | 133,125 | 4,576 | 5,186 | 6,102 |
| 3 | 4 | 215,000 | 161,250 | 6,047 | 6,853 | 8,063 |
| 3 1⁄4 | 4 | 256,000 | 192,000 | 7,800 | 8,840 | 10,400 |
| 3 1⁄2 | 4 | 299,900 | 224,925 | 9,840 | 11,153 | 13,121 |
| 3 3⁄4 | 4 | 347,500 | 260,625 | 12,217 | 13,846 | 16,289 |
| 4 | 4 | 398,000 | 298,500 | 14,925 | 16,915 | 19,900 |