Every bolt size has a recommended torque range based on its diameter, thread pitch, and strength grade. These values are especially important when assembling machinery, structural components, or equipment where clamp force must remain consistent over time. The table below lists baseline torque guidelines for common U.S. bolt sizes.
Bolt Torque Spec Chart
| Size | Grade 2 | Grade 5 | Grade 8 | 18-8 S/S | Bronze | Brass | A2/A4 S/S | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Coarse | Fine | Coarse | Fine | Coarse | Fine | Coarse | Fine | Coarse | Fine | Coarse | Fine | Coarse | Fine | |
| #1 | 0.3 | 0.2 | 0.2 | 0.3 | ||||||||||
| #2 | 0.6 | 0.5 | 0.4 | 0.6 | ||||||||||
| #3 | 1.1 | 0.9 | 0.8 | 1.0 | ||||||||||
| #4 | 5.2 | 4.8 | 4.3 | 5.0 | ||||||||||
| #5 | 9.5 | 8.9 | 7.9 | 9.2 | ||||||||||
| #6 | 14.5 | 13.5 | 12.0 | 14.0 | ||||||||||
| #8 | 19.8 | 18.4 | 16.2 | 19.0 | ||||||||||
| #10 | 22.8 | 31.7 | 21.2 | 29.3 | 18.6 | 25.9 | 22.0 | 30.5 | ||||||
| 1/4″ | 4 | 4.7 | 6.3 | 7.3 | 9 | 10 | 6.3 | 7.8 | 5.7 | 7.3 | 5.1 | 6.4 | 6.5 | 8.0 |
| 5/16″ | 8 | 9 | 13 | 14 | 18 | 20 | 11 | 11.8 | 10.3 | 10.9 | 8.9 | 9.7 | 11.5 | 12.2 |
| 3/8″ | 15 | 17 | 23 | 26 | 33 | 37 | 20 | 22 | 18 | 20 | 16 | 18 | 21 | 23 |
| 7/16″ | 24 | 27 | 37 | 41 | 52 | 58 | 31 | 33 | 29 | 31 | 26 | 27 | 32 | 34 |
| 1/2″ | 37 | 41 | 57 | 64 | 80 | 90 | 43 | 45 | 40 | 42 | 35 | 37 | 44 | 46 |
| 9/16″ | 53 | 59 | 82 | 91 | 115 | 129 | 57 | 63 | 53 | 58 | 47 | 51 | 59 | 65 |
| 5/8″ | 73 | 83 | 112 | 128 | 159 | 180 | 93 | 104 | 86 | 96 | 76 | 85 | 96 | 107 |
| 3/4″ | 125 | 138 | 200 | 223 | 282 | 315 | 128 | 124 | 104 | 102 | 118 | 115 | 132 | 128 |
| 7/8″ | 129 | 144 | 322 | 355 | 454 | 501 | 194 | 193 | 178 | 178 | 159 | 158 | 200 | 199 |
| 1″ | 188 | 210 | 483 | 541 | 682 | 764 | 287 | 289 | 265 | 240 | 235 | 212 | 296 | 298 |
| 1-1/8″ | 258 | 288 | 660 | 738 | 932 | 1043 | 394 | 396 | 363 | 329 | 322 | 290 | 406 | 408 |
| 1-1/4″ | 340 | 380 | 870 | 974 | 1229 | 1376 | 520 | 523 | 479 | 434 | 425 | 383 | 536 | 539 |
| 1-3/8″ | 435 | 486 | 1113 | 1246 | 1572 | 1760 | 665 | 669 | 613 | 555 | 543 | 490 | 686 | 690 |
| 1-1/2″ | 543 | 607 | 1389 | 1555 | 1962 | 2196 | 830 | 835 | 765 | 693 | 678 | 612 | 856 | 861 |
| 1-3/4″ | 840 | 939 | 2149 | 2406 | 3036 | 3399 | 1285 | 1292 | 1184 | 1073 | 1050 | 948 | 1325 | 1332 |
| 2″ | 1210 | 1353 | 3095 | 3465 | 4371 | 4894 | 1850 | 1860 | 1705 | 1545 | 1512 | 1364 | 1907 | 1918 |
† Sizes #1-#10 represent machine screw sizes; fractional sizes are standard bolt sizes
Parting Thoughts
MISUMI USA carries a wide range of bolts, fasteners, and torque wrenches. If you have any questions about torque concerns for your next project or fix, please feel free to contact our product experts, and engineers. For more insights about bolts, and torque, and other manufacturing related articles be sure to check out our blog, and articles like – Torque Conversion Calculator, Torque Conversion Charts, Socket Size Chart, and more.
Author: Scott Bredemann | Updated: 12/10/2025
Disclaimer:
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements.