TABLE 3 - SUGGESTED TORQUE VALUES AND CLAMP LOADS FOR GRADES 2, 5, & 8 CAPSCREWS SAE GRADE 2 CAPSCREWS SAE GRADE 5 CAPSCREWS SAE GRADE 8 CAPSCREWS NOMINAL THREAD DIAMETER STRESS CLAMP LOAD TIGHTENING CLAMP LOAD TIGHTENING CLAMP LOAD TIGHTENING AND TPI AREA 60-90% TORQUE 60-90% TORQUE 60-90% TORQUE (INCHES) (SQ-IN) PROOF (FT-LBS) PROOF (FT-LBS) PROOF (FT-LBS) (POUNDS) (POUNDS) (POUNDS) 1/4 - 20 0.0318 1049 1574 4 7 1622 2433 7 10 2290 3434 10 14 1/4 - 28 0.0364 1201 1802 5 8 1856 2785 8 12 2621 3931 11 16 5/16 - 18 0.0524 1729 2594 9 14 2672 4009 14 21 3773 5659 20 29 5/16 - 24 0.0580 1914 2871 10 15 2958 4437 15 23 4176 6264 22 33 3/8 - 16 0.0775 2558 3868 16 24 3953 5929 25 37 5580 8370 35 52 3/8 - 24 0.0878 2897 4346 18 27 4478 6717 28 42 6322 9482 40 59 7/16 - 14 0.1063 3508 5262 26 38 5421 8132 40 59 7654 11480 56 84 7/16 - 20 0.1187 3917 5876 29 43 6054 9081 44 66 8546 12820 62 93 1/2 - 13 0.1419 4683 7024 39 59 7237 10855 60 90 10217 15325 85 128 1/2 - 20 0.1599 5277 7915 44 66 8155 12232 68 102 11513 17269 96 144 9/16 - 12 0.1820 6006 9009 56 84 9282 13923 87 131 13104 19656 123 184 9/16 - 18 0.2030 6699 10049 63 94 10353 15530 97 146 1466 21924 137 206 5/8 - 11 0.2260 7458 11187 78 117 11526 17289 120 180 16272 24408 170 254 5/8 - 18 0.2560 8448 12672 88 132 13056 19584 136 204 18432 27648 192 288 3/4 - 10 0.3340 11022 16533 138 207 17034 25551 213 319 24048 36072 301 451 3/4 - 16 0.3730 12309 18464 154 231 19023 28535 238 357 26856 40284 336 504 7/8 - 9 0.4620 15246 22869 222 334 23562 35343 344 515 33264 49896 485 728 7/8 - 14 0.5090 16797 25196 245 367 25959 38939 379 568 36648 54972 534 802 1 - 8 0.6060 19998 29997 333 500 30906 46359 515 773 43632 65448 727 1091 1 - 14 0.6790 22407 33611 373 560 34629 51944 577 866 48888 73332 815 1222 1-1/8 - 7 0.7630 25179 37769 472 708 33877 50816 635 953 54936 82404 1030 1545 1-1/8 - 12 0.8560 28248 42372 530 794 38006 57010 713 1069 61632 92448 1156 1733 1-1/4 - 7 0.9690 31977 47966 666 999 43024 64535 896 1344 69768104652 1454 2180 1-1/4 - 12 1.0730 35409 53114 738 1107 47641 71462 993 1489 77256115884 1610 2414