US Bolt Torque Chart

Maximum Tightening Torques for US Imperial Bolts

This table shows values for threads that have been lightly oiled and the tension is 70% of yield strength. For dry bolts, the values should be increased by 30%.

Size (in) Recommended Maximum Tightening Torque (lb-ft)
SAE Grade 2 SAE Grade 5 SAE Grade 8 18-8 S/S
Coarse Fine Coarse Fine Coarse Fine Coarse Fine
1/4 4 4.7 6.3 7.3 9 10 6.3 7.8
5/16 8 9 13 14 18 20 11 11.8
3/8 15 17 23 26 33 37 20 22
7/16 24 27 37 41 52 58 31 33
1/2 37 41 57 64 80 90 43 45
9/16 53 59 82 91 115 129 57 63
5/8 73 83 112 128 150 180 93 104
3/4 115 138 200 223 282 315 128 124
7/8 129 144 322 355 454 501 194 193
1 188 210 483 541 682 764 287 289

These values should only be used when the machine manufacturer has not provided their own.

Metric bolt torque chart

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