TM 10-4320-346-12&P Table H-1.  General Torque Requirements for Dry Fasteners.*  - Continued. Torque Requirement in lb ft (N.m) Bolt/ Screw SAE Grade SAE Grade SAE Grade SAE Grade Size 1 or 2 5 6 or 7 8 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 H-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 6.50 (0.73) 3/8-24 9.5 (1.07) 7/16-20 14.0 (1.58) 1/2-20 18.0 (2.03) 9/16-18 24.0 (2.71) 5/8-18 32.0 (3.62) 3/4-16 50.0 (5.65) 7/8-14 70.0 (7.91) 1-12 90.0 (10.17) 1-1/8-12 117.0 (13.22) H-2