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 |