Torque Limits for US Threads (foot-pounds)

Thread
Size

SAE Grade 2
74,000 psi Low Carbon Steel

SAE Grade 5
120,000 psi Medium Carbon Heat T. Steel

SAE Grade 8
150,000 psi Medium Carbon Alloy Steel
Dry Lubricated Dry Lubricated Dry Lubricated

1/4-20

 5.6 - 6.8 3.5 - 5.1  8.6 - 10.4 5.4 - 7.9 12.2 - 14.9  7.6 - 11.2

1/4-28

 6.6 - 7.8 4.0 - 5.8  9.8 - 12.1 6.1 - 9.0 13.9 - 17.0  8.7 - 12.8

5/16-18

 11.5 - 14.0  7.1 - 10.5 17.8 - 21.7 11.0 - 16.3 25.1 - 30.6 15.6 - 23.0

5/16-24

 12.7 - 15.6  7.9 - 11.7 19.7 - 24.0 12.2 - 18.0 27.8 - 33.9 17.3 - 25.4

3/8-16

 20.4 - 24.9 12.7 - 18.7 31.5 - 38.5 19.6 - 28.9 44.5 - 54.3 27.7 - 40.8

3/8-24

 23.1 - 28.2 14.4 - 21.2 35.7 - 43.6 22.2 - 32.7 50.4 - 61.6 31.4 - 46.2

7/16-14

 32.6 - 39.9 20.3 - 29.9 50.4 - 61.6 31.4 - 46.2 71.2 - 87.0 44.3 - 65.2

7/16-20

 36.4 - 44.5 22.7 - 33.4 56.3 - 68.8 35.0 - 51.6 79.5 - 97.0 49.4 - 72.8

1/2-13

 49.8 - 60.8 31.0 - 45.6 76.9 - 94.0 47.8 - 70.5 109 - 133 67.5 - 100

1/2-20

 56.1 - 68.5 34.9 - 51.4 86.7 - 106 53.9 - 79.5 122 - 150 76.1 - 112

9/16-12

 71.8 - 87.7 44.7 - 65.8 111 - 136 69.0 - 102 157 - 191 97.4 - 144

9/16-18

 80.0 - 98.0 49.8 - 73.4 124 - 151 77.0 - 113 175 - 214 109 - 160

5/8-11

 99.0 - 121 61.6 - 90.8 153 - 187 95.0 - 140 216 - 264 134 - 198

5/8-18

 112 - 137 69.8 - 103 173 - 212 108 - 159 245 - 299 152 - 224

3/4-10

 176 - 215 109 - 161 272 - 332 169 - 249 384 - 469 239 - 352

3/4-16

 196 - 240 122 - 180 303 - 371 189 - 278 428 - 523 266 - 392

7/8-9

 170 - 208 106 - 156 438 - 535 272 - 401 618 - 756 385 - 567

7/8-14

 188 - 229 117 - 172 483 - 590 301 - 443 682 - 834 424 - 625

1-8

 255 - 312 159 - 234 656 - 802 408 - 602  927 - 1133 577 - 850

1-12

 279 - 341 174 - 256 719 - 878 447 - 659 1014 - 1240 631 - 930

1-14

 286 - 350 178 - 262 737 - 901 458 - 675 1040 - 1271 647 - 954

1·1/8-7

 361 - 442 225 - 331 810 - 990 504 - 743 1314 - 1606  817 - 1204

1·1/8-12

 405 - 495 252 - 371  908 - 1110 565 - 833 1473 - 1800  916 - 1350

1·1/4-7

 510 - 623 317 - 467 1143 - 1397  711 - 1048 1853 - 2265 1153 - 1699

1·1/4-12

 564 - 690 351 - 517 1265 - 1547  787 - 1160 2052 - 2508 1277 - 1881

1·3/8-6

 668 - 817 416 - 612 1498 - 1831  932 - 1373 2430 - 2970 1512 - 2227

1·3/8-12

 761 - 930 473 - 697 1706 - 2085 1061 - 1563 2766 - 3380 1721 - 2535

1·1/2-6

  887 - 1084 552 - 813 1989 - 2431 1237 - 1823 3225 - 3942 2007 - 2956

1·1/2-12

  998 - 1220 621 - 915 2238 - 2735 1392 - 2051 3628 - 4435 3258 - 3326


Sizes #2 - #12