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ASTM A307

Bolt Size TPI Proof Load (lbs)1 Clamp Load (lbs)2 Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
1⁄4 20 1,053 790 2 4 3
5⁄16 18 1,735 1,302 3 8 7
3⁄8 16 2,567 1,925 6 15 12
7⁄16 14 3,521 2,640 10 24 19
1⁄2 13 4,700 3,525 15 37 29
9⁄16 12 6,028 4,521 21 53 42
5⁄8 11 7,485 5,614 29 73 58
3⁄4 10 11,062 8,297 52 130 104
7⁄8 9 15,301 11,476 84 209 167
1 8 20,071 15,053 125 314 251
11⁄8 7 25,271 18,953 178 444 355
11⁄4 7 32,093 24,070 251 627 501
13⁄8 6 38,254 28,690 329 822 657
11⁄2 6 46,534 34,900 436 1,091 873
13⁄4 5 62,928 47,196 688 1,721 1,377
2 41⁄2 82,800 62,100 1,035 2,588 2,070
21⁄4 41⁄2 107,640 80,730 1,514 3,784 3,027
21⁄2 4 132,480 99,360 2,070 5,125 4,140
23⁄4 4 163,282 122,461 2,806 7,016 5,613
3 4 197,726 148,295 3,707 9,268 7,415
31⁄4 4 235,152 176,364 4,777 11,941 9,553
31⁄2 4 275,890 206,917 6,035 15,088 12,070
33⁄4 4 319,939 239,954 7,499 18,746 14,997
4 4 366,970 275,227 9,174 22,936 18,348
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