Inch Bolt Torque Table
Estimated with clamp load as 75% of proof load
as specified in SAE J429 and ASME 574 |
| Steel Grade |
SAE 5
 |
SAE 8
 |
Socket Head
Cap Screws
 |
Minimum Tensile
Strength PSI |
120,000 |
150,000 |
1/4-1/2" 180,000
5/8-1" 170,000 |
Nominal Dia.
and
Thread Pitch |
Torque in Newton Meter - Nm |
| Dry |
Lubed |
Dry |
Lubed |
Dry |
Lubed |
| 1/4-20 |
11.4 |
8.6 |
16.2 |
12 |
19 |
13.6 |
| 1/4-28 |
13.1 |
9.8 |
16.6 |
13.9 |
21.7 |
16.3 |
| 5/16-18 |
23.6 |
17.7 |
33.3 |
25 |
39.3 |
29.8 |
| 5/16-24 |
26.1 |
19.7 |
36.9 |
27.7 |
43.4 |
32.5 |
| 3/8-16 |
42 |
31.2 |
60 |
45 |
69 |
52 |
| 3/8-24 |
47 |
35 |
66 |
50 |
79 |
58 |
| 7/16-14 |
66 |
50 |
95 |
71 |
110 |
83 |
| 7/16-20 |
75 |
56 |
106 |
79 |
123 |
92 |
| 1/2-13 |
102 |
77 |
144 |
108 |
168 |
126 |
| 1/2-20 |
115 |
87 |
163 |
122 |
190 |
142 |
| 5/8-11 |
203 |
153 |
287 |
216 |
323 |
243 |
| 5/8-18 |
230 |
172 |
325 |
244 |
366 |
274 |
| 3/4-10 |
362 |
271 |
510 |
382 |
574 |
430 |
| 3/4-16 |
403 |
302 |
569 |
427 |
640 |
480 |
| 7/8-9 |
582 |
437 |
822 |
617 |
925 |
693 |
| 7/8-14 |
643 |
481 |
907 |
681 |
1020 |
765 |
| 1-8 |
873 |
655 |
1232 |
923 |
1879 |
1040 |
| 1-12 |
979 |
735 |
1383 |
1037 |
1555 |
1166 |
Lubed means cleaned dry bolts lubricated with a standard medium viscosity
machine oil. Lubricate all contact areas of the bolts and washers. Lubricating
the bolts is the suggested method. Thread Engagement
|
Note: Much effort has been made to make sure that this information is accurate. However, it is the user's responsibility to verify that the provided information is correct before using it.