ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS TM 09249A/09246A-24 G-2 TABLE G-1.  TORQUE LIMITS FOR DRY FASTENERS (continued) TORQUE SIZE SAE GRADE 6 SAE GRADE 7 SAE GRADE 8 Diameter in Inches Threads Per Inch Millimeters Foot Pounds Newton Meters Foot Pounds Newton Meters Foot Pounds Newton Meters 1/4 20 6.350 13 17 13 18 14 19 1/4 28 6.350 14 18 14 19 15 21 5/16 18 7.937 24 33 25 34 29 39 5/16 24 7.937 26 35 27 37 32 43 3/8 16 9.525 43 58 44 60 47 64 3/8 24 9.525 47 64 48 65 51 69 7/16 14 11.112 69 94 71 96 78 106 7/16 20 11.112 75 102 77 105 85 115 1/2 13 12.700 106 144 110 149 119 161 1/2 20 12.700 116 157 120 163 130 176 9/16 12 14.287 150 203 154 209 169 229 9/16 18 14.287 164 222 168 228 184 250 5/8 11 15.875 209 283 215 291 230 312 5/8 28 15.875 228 309 234 318 251 340 3/4 10 19.050 350 475 360 488 380 515 3/4 26 19.050 382 517 392 532 414 562 7/8 9 22.225 550 746 570 773 600 813 7/8 24 22.225 600 813 621 842 654 887 1 8 25.400 825 1119 840 1139 900 1220 1 14 25.400 899 1219 916 1241 981 1330 See Table G-2 for the effect of lubrication on torque. TABLE G-2.  EFFECT OF LUBRICATION ON TORQUE TORQUE RATING IN FOOT-POUNDS Lubricant 5/16-18 Thread/Inch 1/2-13 Thread/Inch NO LUBE, Steel 29 121 Plated and cleaned 19 (66%) 90 (26%) SAE 20 Oil 18 (38%) 87 (28%) SAE 40 Oil 17 (41%) 83 (31%) Plated and SAE 30 16 (45%) 79 (35%) White Grease 16 (45%) 79 (35%) White Moly Film 14 (52%) 66 (45%) Graphite and Oil 13 (55%) 62 (49%) Use the above lubrication percentages to calculate the approximate decrease in torque rating for other bolt sizes.