Fig. 2 FASTENER IDENTIFICATION4 INTRODUCTION VABolt Markings and Torque- MetricCommercial Steel Class9.8 10.9 12.9Bolt Head Markings0 ~ e ~ G~BodySize Torque Torque TorqueDiam. Cast Iron Aluminum Cast Iron Aluminum Cast Iron Aluminummm N•m ft-lb N•m ft-lb N•m ft-lb N•m ft-lb N•m ft-lb N•m ft-lb6 9 5 7 4 14 9 11 7 14 9 11 77 14 9 11 7 18 14 14 11 23 18 18 148 25 18 18 14 32 23 25 18 36 27 28 2110 40 30 30 25 60 45 45 35 70 50 55 4012 70 55 55 40 105 75 80 60 125 95 100 7514 115 85 90 65 160 120 125 95 195 145 150 11016 180 130 140 100 240 175 190 135 290 210 220 16518 230 170 180 135 320 240 250 185 400 290 310 230Bolt Markings and Torque Values- U.S. CustomarySAE Grade Number 5 8Bolt Head Markings~ @~These are all SAE Grade 5 (3) line@@@ Bolt Torque - Grade 5 Bolt Bolt Torque- Grade 8 BoltBody Size Cast Iron Aluminum Cast Iron AluminumN•m ft-lb N•m ft-lb N•m ft-lb N•m ft-lb1/4-20 9 7 8 6 15 11 12 9-28 12 9 9 7 18 13 14 105/16- 18 20 15 16 12 30 22 24 18-24 23 17 19 14 33 24 25 193/8 - 16 40 30 25 20 55 40 40 30-24 40 30 35 25 60 45 45 357/16- 14 60 45 45 35 90 65 65 50-20 65 50 55 40 95 70 75 551/2- 13 95 70 75 55 130 95 100 75-20 100 75 80 60 150 110 120 909/16- 12 135 100 110 80 190 140 150 110- 18 150 110 115 85 210 155 170 1255/8 -11 180 135 150 110 255 190 205 150- 18 210 155 160 120 290 215 230 1703/4 -10 325 240 255 190 460 340 365 270- 16 365 270 285 210 515 380 410 3007/8-9 490 360 380 280 745 550 600 440-14 530 390 420 310 825 610 660 490-8 720 530 570 420 1100 820 890 660-14 800 590 650 480 1200 890 960 71080bdbd8c