US Bolt Torque 

Recommended Torque (Ft-Lbs)

Size Grade 5 Coarse Grade 5 Fine Grade 8 Coarse Grade 8 Fine 18-8 SS Coarse 18-8 SS Fine Bronze Coarse Bronze Fine Brass Coarse Brass Fine
1/4 8 10 12 14 6.3 7.8 5.7 7.3 5.1 6.4
5/16 17 19 24 27 11 11.8 10.3 10.9 8.9 9.7
3/8 31 35 44 49 20 22 18 20 16 18
7/16 49 55 70 78 31 33 29 31 26 27
1/2 75 85 105 120 43 45 40 42 35 37
9/16 110 120 155 170 57 63 53 58 47 51
5/8 150 170 284 323 93 104 86 96 76 85
3/4 270 295 510 568 128 124 104 102 118 115
7/8 395 435 813 902 194 193 178 178 159 158
1 590 660 905 1030 287 289 265 240 235 212

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