Introduction - Section 1 OM1006.2 Page 1-14 Standard Charts and Tables TABLE XII -- Standard Assembly Torques For 12-Point, Grade 9, Capscrews (SAE) The following specifications appy to required assembly torques for all 12-Point, Grade 9 (170,000 psi minimum tensile), Capscrews. Capscrew threads and seats SHALL be lubricated when assembled. Unless instructions specifically recommend oth- erwise, these standard torque values are to be used with simple lithium base chassis grease (multi-purpose EP NLGI) or a rust- preventive grease (see list, this page) on the threads . Torques are calculated to give a clamping force of approximately 75% of proof load.
The maximum torque tolerance shall be ± 10% of the torque value shown. TABLE XI STANDARD TORQUE CHART SAE HEX HEAD CAPSCREW AND NUT ASSEMBLY (LUBRICATED THREADS) TOLERANCES ± 10% GRADE 5 GRADE 8 CAP- SCREW THREAD SIZE TORQUE -- GRADE 5 TORQUE -- GRADE 8 CAPSCREW THREAD SIZE TORQUE -- GRADE 5 TORQUE -- GRADE 8 ft. lbs. kg.m N.m ft. lbs. kg.m N.m ft. lbs. kg.m N.m ft. lbs.
kg.m N.m 1/4--20 7 0.97 9.5 10 1.38 13.6 3/4--16 235 32.5 319 335 46.3 454 1/4--28 8 1.11 10.8 11 1.52 14.9 7/8--9 350 48.4 475 500 69.2 678 5/16--18 15 2.07 20.3 21 2.90 28 7/8--14 375 51.9 508 530 73.3 719 5/16--24 16 2.21 22 22 3.04 30 1.0--8 525 72.6 712 750 103.7 1017 3/8--16 25 3.46 34 35 4.84 47 1.0--12 560 77.4 759 790 109.3 1071 3/8--24 30 4.15 41 40 5.5 54 1.0--14 570 78.8 773 800 110.6 1085 7/16--14 40 5.5 54 58 8.0 79 1 1/8--7 650 89.9 881 1050 145 1424 7/16--20 45 6.2 61 62 8.57 84 1 1/8--12 700 96.8 949 1140 158 1546 1/2--13 65 9 88 90 12.4 122 1 1/4--7 910 125.9 1234 1480 205 2007 1/2--20 70 9.7 95 95 13.1 129 1 1/4--12 975 134.8 1322 1580 219 2142 9/16--12 90 12.4 122 125 17.3 169 1 3/8--6 1200 166 1627 1940 268 2630 9/16--18 95 13.1 129 135 18.7 183 1 3/8--12 1310 181 1776 2120 293 2874 5/8--11 125 17.3 169 175 24.2 237 1 1/2--6 1580 219 2142 2560 354 3471 5/8--18 135 18.7 183 190 26.2 258 1 1/2--12 1700 235 2305 2770 383 3756 3/4--10 220 30.4 298 310 42.8 420 1 ft.
lbs. = 0.138 kg.m = 1.356 N.m TABLE XII - STANDARD ASSEMBLY TORQUE for 12-Point, Grade 9, Capscrews CAPSCREW SIZE* TORQUE ft. lbs. TORQUE N.m TORQUE kg.m 0.250 - 20 12 16 1.7 0.312 - 18 24 33 3.3 0.375 - 16 42 57 5.8 0.438 - 14 70 95 9.7 0.500 - 13 105 142 14.5 0.562 - 12 150 203 20.7 0.625 - 11 205 278 28.3 0.750 - 10 360 488 49.7 0.875 - 9 575 780 79.4 1.000 - 8 860 1166 119 1.000 - 12 915 1240 126 1.125 - 7 1230 1670 170 1.125 - 12 1330 1800 184 1.250 - 7 1715 2325 237 1.250 - 12 1840 2495 254 1.375 - 6 2270 3080 313 1.375 - 12 2475 3355 342 1.500 - 6 2980 4040 411 1.500 - 12 3225 4375 445 * Shank Diameter (in.) - Threads per in. This Table represents standard values only.
Do not use these values to replace torque values which are specified in assembly instructions.