Torque Charts

A307

Bolt Size TPI Proof Clamp Tightening Torque (ft lbs)
Proof Load (lbs) Clamp Load (lbs) Galv+Waxed Galv Plain
1⁄4 20 1145 859 2 4 4
5⁄16 18 1886 1415 4 9 7
3⁄8 16 2790 2093 7 16 13
7⁄16 14 3827 2870 10 26 21
1⁄2 13 5108 3831 16 40 32
9⁄16 12 6552 4914 23 58 46
5⁄8 11 8136 6102 32 79 64
3⁄4 10 12024 9018 56 141 113
7⁄8 9 15200 11400 83 208 166
1 8 20000 15000 125 313 250
11⁄8 7 25200 18900 177 443 354
11⁄4 7 32000 24000 250 625 500
13⁄8 6 38100 28575 327 819 655
11⁄2 6 46400 34800 435 1088 870
13⁄4 5 68400 51300 748 1870 1496
2 41⁄2 90000 67500 1125 2813 2250
21⁄4 41⁄2 117000 87750 1645 4113 3291
21⁄2 4 144000 108000 2250 5625 4500
23⁄4 4 177480 133110 3050 7626 6101
3 4 214920 161190 4030 10074 8060
31⁄4 4 255600 191700 5192 12980 10384
31⁄2 4 299880 224910 6560 16400 13120
33⁄4 4 347760 260820 8151 20377 16301
4 4 398880 299160 9972 24930 19944

A325

Bolt Size TPI Tension Tightening Torque Range
Galv. Plain
Min Max Min – Max Min Max
1⁄2 13 12000 14000 50 – 58 100 – 117
5⁄8 11 19000 23000 99 – 120 198 – 240
3⁄4 10 28000 34000 175 – 213 350 – 425
7⁄8 9 39000 47000 284 – 343 569 – 685
1 8 51000 61000 425 – 508 850 – 1017
11⁄8 7 56000 67000 525 – 625 1050 – 1256
11⁄4 7 71000 85000 740 – 885 1479 – 1771
13⁄8 6 85000 102000 974 – 1169 1948 – 2338
11⁄2 6 103000 124000 1288 – 1550 2575 – 3100

A193 B7

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Galv. Plain
1⁄4 20 3,350 2,513 13 10
5⁄16 18 5,500 4,125 27 21
3⁄8 16 8,150 6,113 48 38
7⁄16 14 11,150 8,363 76 61
1⁄2 13 14,900 11,175 116 93
9⁄16 12 19,100 14,325 168 134
5⁄8 11 23,750 17,813 232 186
3⁄4 10 35,050 26,288 411 329
7⁄8 9 48,500 36,375 663 530
1 8 63,650 47,738 995 796
11⁄8 7 80,100 60,075 1,408 1,126
8 82,934 62,201 583 1,166
11⁄4 7 101,750 76,313 1,987 1,590
8 105,006 78,754 820 1,641
13⁄8 6 121,300 90,975 2,606 2,085
8 129,492 97,119 1,113 2,226
11⁄2 6 147,550 110,663 3,458 2,767
8 156,687 117,515 1,469 2,938
13⁄4 5 199,500 149,625 – 4,364
8 218,400 163,800 – 4,778
2 41⁄2 262,500 196,875 – 6,563
8 290,850 218,138 – 7,271
21⁄4 41⁄2 341,250 255,938 – 9,598
8 373,801 280,351 – 10,513
21⁄2 4 420,000 315,000 – 13,125
8 466,200 349,650 – 14,569
23⁄4 4 468,500 351,263 – 16,100
8 515,851 386,888 – 17,732
3 4 567,150 425,363 – 21,268
8 618,451 463,838 – 23,192
31⁄4 4 674,500 505,875 – 27,402
8 730,550 547,913 – 29,679
31⁄2 4 791,350 593,513 – 34,622
8 851,201 638,401 – 37,240
33⁄4 4 917700 688275 – 43017
8 982,300 736,725 – 46,045
4 4 1052600 789450 – 52630
8 1,121,950 841,463 – 56,098

Tech Info