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BOLT MARKINGS AND TORQUES - METRIC Bolt Markings 8.8/8.9 10.9 12.9 Bolt Dia. N·m Ft. Lbs. N·m Ft. Lbs. N·m Ft. Lbs. 6 12 105* 14 120* 16 12 8 25 250* 32 23 38 28 10 54 40 60 45 74 55 12 95 70 108 80 135 100 14 155 115 175 130 216 160 16 243 180 324 210 324 240 * Inch Lbs. BOLT MARKINGS AND TORQUES - U. S. CUSTOMARY Bolt Markings Grade 5 Grade 8 Bolt Dia. N·m Ft. Lbs N·m Ft. Lbs 1/4 - 20 10 95* 14 125* 1/4 - 28 10 95* 17 150* 5/16 - 18 22 200* 30 270* 5/16 - 24 26 240* 33 300* 3/8 - 16 40 30 55 40 3/8 - 24 47 35 60 45 7/16 - 14 68 50 88 65 7/16 - 20 74 55 95 70 1/2 - 13 101 75 135 100 1/2 -20 115 85 150 110 9/16 - 12 135 105 182 135 9/16 - 18 155 115 202 150 5/8 - 11 202 150 263 195 5/8 - 18 215 160 284 210 3/4 - 10 230 170 297 220 3/4 - 16 236 175 304 225 7/8 - 14 405 300 540 400 * Inch Lbs. PT INTRODUCTION 3 FASTENER IDENTIFICATION (Continued) |