TM 9-4310-394-13 Table G-1.  General Torque Requirements for Dry Fasteners.  - Continued. Torque Requirement in lb ft (N.m) Bolt/Screw Size SAE Grade1 or 2 SAE Grade5 SAE Grade6 or 7 SAE Grade8 1-8 UNC 235 (319) 590 (800) 660 (895) 910 (1234) 1-14 UNF 250 (339) 660 (895) 825 (1119) 990 (1342) 1-1/8-7 UNC 350 (475) 800 (1085) 1000 (1356) 1280 (1736) 1-1/8-12 UNF 400 (542) 880 (1193) 1050 (1424) 1440 (1953) 1-1/4-7 UNC 500 (678) 1080 (1464) 1325 (1797) 1820 (2468) 1-1/4-12 UNF 550 (746) 1125 (1526) 1325 (1797) 1820 (2712) 1-3/8-6 UNC 660 (895) 1460 (1980) 1800 (2441) 2380 (3227) 1-3/8-12 UNF 740 (1003) 1680 (2278) 1960 (2658) 2720 (3688) 1-1/2-6 UNC 870 (1180) 1940 (2631) 2913 (3950) 3160 (4285) 1-1/2-12 UNF 980 (1329) 2200 (2983) 3000 (4068) 3560 (4827) * Torque given is for clean, dry threads.  Reduce by 10% when engine oil is used as lubricant. Table G-2.  Locknut Breakaway Torque Values. NOTE To determine breakaway torque, thread lock nut onto screw or bolt until at least two threads stick  out.    Locknut  shall  not  make  contact  with  a  mating  part.    Stop  the  locknut.    Torque necessary to begin turning locknut again is the breakaway torque.  Do not reuse locknuts that do not meet minimum breakaway torque. Minimum Breakaway Torque Thread Size lb-in. (N.m) 10-32 2.0 (0.23) ¼-28 3.5 (0.40) 5/16-24 6.5 (0.73) 3/8-24 9.5 (1.07) 7/16-20 14.0 (1.58) ½ -20 18.0 (2.03) 9/16-18 24.0 (2.71) 5/8-18 32.0 (3.62) ¾-16 50.0 (5.65) 7/8-14 70.0 (7.97) 1-12 90.0 (10.17) 1-1/8-12 117.0 (13.22) G-2