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TM 9-2350-287-34 C-3.  HOW  TO  USE  TORQUE  TABLE  (continued). CAPSCREW HEAD MARKINGS Manufacturer’s  marks  may  vary. These are all SAE Grade 5 (three- line). 5. To find the grade of the screw that is to be installed, match the markings on the head to the correct picture of CAPSCREW HEAD MARKINGS on the table. 6. Look down the column under the picture found in step 5 until the torque limit in foot-pounds for the diameter and threads per inch of the screw being installed is found. SAE  CAPSCREW  HEAD MARKINGS S I ZE I   N   . 1/4 1/4 5/16 5/1 6 3/8 3/8 7/16 7/16 1/2 1/2 9/1 6 9/16 5/8 5/8 3/4 3/4 7/8 718 1 1 1118 1114 13/8 1 1/2 THREADS PER  INCH 20 28 18 24 16 24 14 20 13 20 12 18 11 18 10 16 9 14 8 14 MM 6.35 6.35 7.94 7.94 9.53 9.53 11.11 12.70 14.29 15.88 19.05 22.23 25.40 25.58 31.75 34.93 38.10 Table C-1. Torque Limits for Dry   Fasteners SAE GRADE No. 1 or 2 FOOT- POUNDS N•m 5 6 11 13 18 20 28 30 39 41 51 55 63 95 105 115 160 175 235 260 6.78 8.14 14.92 17.63 24.41 27.12 37.97 40.68 52.88 55.60 69.16 74.58 85.43 128.82 142.38 155.94 216.96 237.30 318.66 339.00 TORQUE SAE GRADE No. 5 FOOT- POUNDS N•m 8.00 10.00 17.00 19.00 31.00 35.00 49.00 55.00 75.00 85.00 110.00 120.00 150.00 170.00 270.00 295.00 305.00 435.00 590.00 660.00 800.00 880.00 1460.00 1680.00 1940.00 2200.00 10.85 13.56 23.05 25.76 42.04 47.46 66.44 74.58 101.70 115.26 149.16 162.72 203.40 230.52 366.12 400.02 535.62 589.86 800.04 894.96 1064.80 1193.30 1979.80 2278.10 2630.60 2983.20 SAE GRADE No. 6 or 7 FOOT- POUNDS N•m 10 19 34 55 85 120 167 280 660 . 13.56 25.76 46.10 74.58 115.26 162.72 226.45 379.68 596.64 894.96 . SAE GRADE No. 8 FOOT- POUNDS N•m 12.00 14.00 24.00 27.00 44.00 49.00 70.00 78.00 105.00 120.00 155.00 170.00 210.00 240.00 375.00 420.00 605.00 675.00 910.00 990.00 1280.00 1440.00 1820.00 2000.00 2380.00 2720.00 3160.00 3560.00 16.27 18.98 32.52 36.61 59.66 66.44 94.92 105.77 142.38 162.78 210.18 230.52 284.76 325.44 508.50 596.52 820.38 915.30 1233.96 1342.44 1735.70 1952.80 2467.90 2712.00 2337.30 3688.30 4285.00 4827.40 440 C-2

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