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Grade Bolt size Bolt diam- eter* mm Pitch mm Tightening torque (Without lubricant) Hexagon head bolt Hexagon flange bolt N ⋅ m kg-m ft-lb N ⋅ m kg-m ft-lb 4T M6 6.0 1.0 5.1 0.52 3.8 6.1 0.62 4.5 M8 8.0 1.25 13 1.3 9 15 1.5 11 1.0 13 1.3 9 16 1.6 12 M10 10.0 1.5 25 2.5 18 29 3.0 22 1.25 25 2.6 19 30 3.1 22 M12 12.0 1.75 42 4.3 31 51 5.2 38 1.25 46 4.7 34 56 5.7 41 M14 14.0 1.5 74 7.5 54 88 9.0 65 7T M6 6.0 1.0 8.4 0.86 6.2 10 1.0 7 M8 8.0 1.25 21 2.1 15 25 2.5 18 1.0 22 2.2 16 26 2.7 20 M10 10.0 1.5 41 4.2 30 48 4.9 35 1.25 43 4.4 32 51 5.2 38 M12 12.0 1.75 71 7.2 52 84 8.6 62 1.25 77 7.9 57 92 9.4 68 M14 14.0 1.5 127 13.0 94 147 15.0 108 9T M6 6.0 1.0 12 1.2 9 15 1.5 11 M8 8.0 1.25 29 3.0 22 35 3.6 26 1.0 31 3.2 23 37 3.8 27 M10 10.0 1.5 59 6.0 43 70 7.1 51 1.25 62 6.3 46 74 7.5 54 M12 12.0 1.75 98 10.0 72 118 12.0 87 1.25 108 11.0 80 137 14.0 101 M14 14.0 1.5 177 18.0 130 206 21.0 152 1. Special parts are excluded. embossed on the bolt head. Grade Mark 4T ................................................. 4 * : Nominal diameter M 6 Nominal diameter of bolt threads (Unit: mm) Metric screw threads TIGHTENING TORQUE OF STANDARD BOLTS GI-38 |