0-17 Identification by Bolt Shape (Hexagon flange bolt) Tightening Torque Table (Hexagon flange bolt) Class 4.8T 6.8T 8.8T 10.9T 11.9T Hexagon flange bolt No mark No mark — — Class Diameter mm Pitch mm Specified torque N·m kgf·cm ft·lbf 4.8T 6 8 10 12 14 16 1.0 1.25 1.25 1.25 1.5 1.5 5.5 13 27 50 78 120 56 130 280 510 800 1220 4 9 20 37 58 88 6.8T 6 8 10 12 14 16 1.0 1.25 1.25 1.25 1.5 1.5 7.5 19 39 71 110 170 80 190 400 720 1120 1730 6 14 29 52 81 125 8.8T 6 8 10 12 14 16 1.0 1.25 1.25 1.25 1.5 1.5 12 29 61 110 175 270 120 300 620 1120 1780 2750 9 22 45 81 129 199 10.9T 6 8 10 12 14 16 1.0 1.25 1.25 1.25 1.5 1.5 15.5 38 80 145 230 360 160 390 820 1480 2350 3670 12 28 59 107 170 266 11.9T 6 8 10 12 14 16 1.0 1.25 1.25 1.25 1.5 1.5 17.5 42 89 160 260 400 180 430 910 1630 2650 4080 13 31 66 118 192 295