Max Torque (foot-pounds) for clean, dry threads
| Bolt size - Thread pitch |
Grade 2 |
Grade 5 |
Grade 8 |
Special Alloy |
| 1/4-20 |
6 |
10 |
12 |
14 |
| 1/4-28 |
7 |
12 |
15 |
17 |
| 5/16-18 |
13 |
20 |
24 |
29 |
| 5/16-24 |
14 |
22 |
27 |
35 |
| 3/8-16 |
23 |
36 |
44 |
58 |
| 3/8-24 |
26 |
40 |
48 |
69 |
| 7/16-14 |
37 |
52 |
63 |
98 |
| 7/16-20 |
41 |
57 |
70 |
110 |
| 1/2-13 |
57 |
80 |
98 |
145 |
| 1/2-20 |
64 |
90 |
110 |
160 |
| 9/16-12 |
82 |
120 |
145 |
200 |
| 9/16-18 |
91 |
135 |
165 |
220 |
| 5/8-11 |
111 |
165 |
210 |
280 |
| 5/8-18 |
128 |
200 |
245 |
310 |
| 3/4-10 |
200 |
285 |
335 |
490 |
| 3/4-16 |
223 |
315 |
370 |
530 |
| 7/8-9 |
315 |
430 |
500 |
760 |
| 7/8-14 |
340 |
470 |
550 |
800 |
| 1-8 |
400 |
650 |
760 |
1130 |
| 1-14 |
460 |
710 |
835 |
1210 |
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