Here is the bolt torque chart for the ASTM A193 B7 grade bolts. There are several grades under ASTM A193 namely B7, B8 Class 1, B8M Class 1, B8 Class 2, B8M Class 2. ASTM A193 B7 grade bolts are made of Alloy steel, AISI 4140/4142 quenched and tempered and are intended for use in pressure vessels, valves, flanges, and fittings. The below online ASTM A193 B7 Bolt Torque Chart provides tension, torque, TPI information against their corresponding sizes.
| Bolt Size | TPI | Proof Load (lbs) | Clamp Load (lbs) | Tightening Torque (ft lbs) | ||
|---|---|---|---|---|---|---|
| Galv+Waxed | Galv | Plain | ||||
| 1⁄4 | 20 | 3,350 | 2,513 | 5 | 13 | 10 |
| 5⁄16 | 18 | 5,500 | 4,125 | 11 | 27 | 21 |
| 3⁄8 | 16 | 8,150 | 6,113 | 19 | 48 | 38 |
| 7⁄16 | 14 | 11,150 | 8,363 | 30 | 76 | 61 |
| 1⁄2 | 13 | 14,900 | 11,175 | 47 | 116 | 93 |
| 9⁄16 | 12 | 19,100 | 14,325 | 67 | 168 | 134 |
| 5⁄8 | 11 | 23,750 | 17,813 | 93 | 232 | 186 |
| 3⁄4 | 10 | 35,050 | 26,288 | 164 | 411 | 329 |
| 7⁄8 | 9 | 48,500 | 36,375 | 265 | 663 | 530 |
| 1 | 8 | 63,650 | 47,738 | 398 | 995 | 796 |
| 11⁄8 | 7 | 80,100 | 60,075 | 563 | 1,408 | 1,126 |
| 8 | 82,934 | 62,201 | 583 | 1,458 | 1,166 | |
| 11⁄4 | 7 | 101,750 | 76,313 | 795 | 1,987 | 1,590 |
| 8 | 105,006 | 78,754 | 820 | 2,051 | 1,641 | |
| 13⁄8 | 6 | 121,300 | 90,975 | 1,042 | 2,606 | 2,085 |
| 8 | 129,492 | 97,119 | 1,113 | 2,782 | 2,226 | |
| 11⁄2 | 6 | 147,550 | 110,663 | 1,383 | 3,458 | 2,767 |
| 8 | 156,687 | 117,515 | 1,469 | 3,672 | 2,938 | |
| 13⁄4 | 5 | 199,500 | 149,625 | 2,182 | 5,455 | 4,364 |
| 8 | 218,400 | 163,800 | - | - | 4,778 | |
| 2 | 41⁄2 | 262,500 | 196,875 | 3,281 | 8,203 | 6,563 |
| 8 | 290,850 | 218,138 | - | - | 7,271 | |
| 21⁄4 | 41⁄2 | 341,250 | 255,938 | 4,799 | 11,997 | 9,598 |
| 8 | 373,801 | 280,351 | - | - | 10,513 | |
| 21⁄2 | 4 | 420,000 | 315,000 | 6,563 | 16,406 | 13,125 |
| 8 | 466,200 | 349,650 | - | - | 14,569 | |
| 23⁄4 | 4 | 468,500 | 351,263 | 8,050 | 20,124 | 16,100 |
| 8 | 515,851 | 386,888 | - | - | 17,732 | |
| 3 | 4 | 567,150 | 425,363 | 10,634 | 26,585 | 21,268 |
| 8 | 618,451 | 463,838 | - | - | 23,192 | |
| 31⁄4 | 4 | 674,500 | 505,875 | 13,701 | 34,252 | 27,402 |
| 8 | 730,550 | 547,913 | - | - | 29,679 | |
| 31⁄2 | 4 | 791,350 | 593,513 | 17,311 | 43,277 | 34,622 |
| 8 | 851,201 | 638,401 | - | - | 37,240 | |
| 33⁄4 | 4 | 917700 | 688275 | 21,509 | 53,771 | 43017 |
| 8 | 982,300 | 736,725 | - | - | 46,045 | |
| 4 | 4 | 1052600 | 789450 | 26,315 | 65,788 | 52630 |
| 8 | 1,121,950 | 841,463 | - | - | 56,098 | |
ASTM A193 B7 Bolt Torque Chart helps you to know the galvanized weight for different bolt sizes.
