Torque Tables And Conversion Charts- Section 12 9/11 OM1201 Page 12-4 STANDARD TIGHTENING TORQUES For SAE Grade 9 Cap screws The following specifications apply to required assem- bly torques for all 12-point, grade 9 (170,000 psi min- imum tensile), cap screws. • Cap screw threads and seats shall be lubricated when assembled. Unless instructions specifically recommend otherwise, 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 3. Standard Tightening Torque for 12-Point, Grade 9 Cap Screws Cap Screw Size* Torque N·m Torque ft lb Torque kg·m 0.250 - 20 16 12 1.7 0.312 - 18 33 24 3.3 0.375 - 16 57 42 5.8 0.438 -14 95 70 9.7 0.500 -13 142 105 14.5 0.562 - 12 203 150 20.7 0.625 - 11 278 205 28.3 0.750 - 10 488 360 49.7 0.875 - 9 780 575 79.4 1.000 - 8 1166 860 119 1.000 - 12 1240 915 126 1.125 - 7 1670 1230 170 1.125 - 12 1800 1330 184 1.250 - 7 2325 1715 237 1.250 - 12 2495 1840 254 1.375 - 6 3080 2270 313 1.375 - 12 3355 2475 342 1.500 - 6 4040 2980 411 1.500 - 12 4375 3225 445 * Shank Diameter (in.) - Threads per inch