Bolt Torque Chart

The ASTM A307 is an ASTM International standard for carbon steel bolts and studs ranging from 1/4 inches through 4 inches in diameter which is set by the standards organization ASTM International. Given here is the bolt torque chart for the ASTM A307 bolts. These bolts are categorized into three grades, grade A (Headed bolts), grade B (Headed, Heavy hex bolts) and grade C (Nonheaded anchor bolts) where ASTM A307 Grades A and B has one inch diameter bolt.

ASTM A307 Bolt Torque Table

Bolt Size TPI Proof Clamp
Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
14 20 1,145 859 2 4 4
516 18 1,886 1,415 4 9 7
38 16 2,790 2,093 7 16 13
716 14 3,827 2,870 10 26 21
12 13 5,108 3,831 16 40 32
916 12 6,552 4,914 23 58 46
58 11 8,136 6,102 32 79 64
34 10 12,024 9,018 56 141 113
78 9 15,200 11,400 83 208 166
1 8 20,000 15,000 125 313 250
118 7 25,200 18,900 177 443 354
114 7 32,000 24,000 250 625 500
138 6 38,100 28,575 327 819 655
112 6 46,400 34,800 435 1,088 870
134 5 68,400 51,300 748 1,870 1,496
2 412 90,000 67,500 1,125 2,813 2,250
214 412 117,000 87,750 1,645 4,113 3,291
212 4 144,000 108,000 2,250 5,625 4,500
234 4 177,480 133,110 3,050 7,626 6,101
3 4 214,920 161,190 4,030 10,074 8,060
314 4 255,600 191,700 5,192 12,980 10,384
312 4 299,880 224,910 6,560 16,400 13,120
334 4 347,760 260,820 8,151 20,377 16,301
4 4 398,880 299,160 9,972 24,930 19,944

The ASTM A307 Bolt Torque Table provides tension, torque and TPI against their corresponding sizes. In heavy timber construction, A307 bolts are used for wood and it has a minimum tensile strength of 60 ksi.


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