Bolt Size |
TPI |
Proof Load (lbs) |
Clamp Load (lbs) |
Tightening Torque (ft lbs) |
||
Waxed |
Zinc |
Dry |
||||
| 1⁄4 | 20 | 3800 | 2850 | 8.90 | 10.10 | 11.90 |
| 5/16 | 18 | 6300 | 4725 | 18.50 | 20.90 | 24.60 |
| 3/8 | 16 | 9300 | 6975 | 32.70 | 37.10 | 43.60 |
| 7/16 | 14 | 12750 | 9563 | 52.30 | 59.30 | 69.70 |
| 1⁄2 | 13 | 17050 | 12788 | 79.90 | 90.60 | 106.60 |
| 9/16 | 12 | 21850 | 16388 | 115.20 | 130.60 | 153.60 |
| 5/8 | 11 | 27100 | 20325 | 158.80 | 180.00 | 211.70 |
| 3⁄4 | 10 | 40100 | 30075 | 282.00 | 319.50 | 375.90 |
| 7/8 | 9 | 55450 | 41588 | 454.90 | 515.50 | 606.50 |
| 1 | 8 | 72700 | 54525 | 681.60 | 772.40 | 908.80 |
| 1 1/8 | 7 | 91550 | 68663 | 965.60 | 1094.30 | 1287.40 |
| 1 1⁄4 | 7 | 120000 | 90000 | 1406.30 | 1593.80 | 1875.00 |
| 1 3/8 | 6 | 138600 | 103950 | 1786.60 | 2024.90 | 2382.20 |
| 1 1⁄2 | 6 | 168600 | 126450 | 2370.90 | 2687.10 | 3161.30 |
| 1 3⁄4 | 5 | 228000 | 171000 | 3740.60 | 4239.40 | 4987.50 |
| 2 | 4 1⁄2 | 300000 | 225000 | 5625.00 | 6375.00 | 7500.00 |
| 2 1⁄4 | 4 1⁄2 | 390000 | 292500 | 8226.60 | 9323.40 | 10968.80 |
| 2 1⁄2 | 4 | 480000 | 360000 | 11250.00 | 12750.00 | 15000.00 |
| 2 3⁄4 | 4 | 517650 | 388238 | 13345.70 | 15125.10 | 17794.20 |
| 3 | 4 | 626850 | 470138 | 17630.20 | 19980.80 | 23506.90 |
| 3 1⁄4 | 4 | 745500 | 559125 | 22714.50 | 25743.00 | 30285.90 |
| 3 1⁄2 | 4 | 874650 | 655988 | 28699.50 | 32526.00 | 38265.90 |
| 3 3⁄4 | 4 | 1014300 | 760725 | 35659.00 | 40413.50 | 47545.30 |
| 4 | 4 | 1163400 | 872550 | 43627.50 | 49444.50 | 58170.00 |