TM 9-2330-390-14&PNOTEEngine screw and bolt material grades are indicated by numbers punched on screwand bolt heads. Prior to tightening, check material grade number.Table H-2. Engine Torque Limits.GradeNominal Diameterin Millimeters681012Standard Screw and BoltTorquelb.-ft.5.83 to 6.8613.05 to 15.1928.91 to 33.2646.31 to 53.54(Nl m)(7.90 to 9.30)(17.70 to 20.60)(39.20 to 45.10)(62.80 to 72.60)Special Screw and BoltTorquelb.-ft.(Nl m)7.23 to 8.33(9.80 to 11.30)17.33 to 20.28(23.50 to 27.50)35.47 to 41.22(48.10 to 55.90)57.15 to 66.52(77.50 to 90.20)H-3/(H-4 Blank)
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