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Torque Chart
This table provides an estimate of torque required to induce corresponding clamp load in a bolt for non-critical, plated bolt, nut and washer assemblies (not tapped holes). Consult a qualified engineer for critical applications since many variables
affect final assembly torque.
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Size |
Clamp Load |
Torque |
Clamp Load |
Torque |
Clamp Load |
Torque |
|
1/4-20 (UNC) |
2,025 |
6 ft. lbs. |
2,850 |
9 ft. lbs. |
3,450 |
11 ft. lbs. |
|
1/4-28 (UNF) |
2,325 |
7 ft. lbs. |
3,263 |
10 ft. lbs. |
3,950 |
13 ft. lbs. |
|
5/16-18 (UNC) |
3,338 |
13 ft. lbs. |
4,725 |
18 ft. lbs. |
5,700 |
21 ft. lbs. |
|
5/16-24 (UNF) |
3,675 |
14 ft. lbs. |
5,113 |
20 ft. lbs. |
6,300 |
23 ft. lbs. |
|
3/8-16 (UNC) |
4,950 |
23 ft. lbs. |
6,975 |
33 ft. lbs. |
8,450 |
33 ft. lbs. |
|
3/8-24 (UNF) |
5,588 |
26 ft. lbs. |
7,785 |
37 ft. lbs. |
9,550 |
38 ft. lbs. |
|
7/16-14 (UNC) |
6,788 |
37 ft. lbs. |
9,600 |
52 ft. lbs. |
11,550 |
60 ft. lbs. |
|
7/16-20 (UNF) |
7,575 |
41 ft. lbs. |
10,650 |
58 ft. lbs. |
12,900 |
65 ft. lbs. |
|
1/2-13 (UNC) |
9,075 |
57 ft. lbs. |
12,750 |
80 ft. lbs. |
15,450 |
95 ft. lbs. |
|
1/2-20 (UNF) |
10,200 |
64 ft. lbs. |
14,400 |
90 ft. lbs. |
17,400 |
105 ft. lbs. |
|
9/16-12 (UNC) |
11,625 |
82 ft. lbs. |
16,350 |
115 ft. lbs. |
19,800 |
140 ft. lbs. |
|
9/16-18 (UNF) |
12,975 |
91 ft. lbs. |
18,300 |
129 ft. lbs. |
22,100 |
150 ft. lbs. |
|
5/8-11 (UNC) |
14,400 |
112 ft. lbs. |
20,325 |
159 ft. lbs. |
24,550 |
185 ft. lbs. |
|
5/8-18 (UNF) |
16,350 |
128 ft. lbs. |
23,125 |
180 ft. lbs. |
27,800 |
205 ft. lbs. |
|
3/4-10 (UNC) |
21,300 |
200 ft. lbs. |
30,075 |
282 ft. lbs. |
36,350 |
290 ft. lbs. |
|
3/4-16 (UNF) |
23,775 |
223 ft. lbs. |
33,600 |
315 ft. lbs. |
40,600 |
355 ft. lbs. |
|
7/8-9 (UNC) |
29,475 |
322 ft. lbs. |
41,550 |
454 ft. lbs. |
50,300 |
505 ft. lbs. |
|
7/8-14 (UNF) |
32,475 |
355 ft. lbs. |
45,825 |
501 ft. lbs. |
55,400 |
585 ft. lbs. |
|
1-8 (UNC) |
38,625 |
483 ft. lbs. |
54,525 |
682 ft. lbs. |
65,900 |
775 ft. lbs. |
|
1-14 (UNF) |
42,300 |
541 ft. lbs. |
61,125 |
764 ft. lbs. |
73,800 |
900 ft. lbs. |
|
1-1/8-7 (UNC) |
42,375 |
596 ft. lbs. |
68,700 |
966 ft. lbs. |
83,000 |
1150 ft. lbs. |
|
1-1/8-12 (UNF) |
47,475 |
668 ft. lbs. |
77,025 |
1083 ft. lbs. |
93,100 |
1325 ft. lbs. |
|
1-1/4-7 (UNC) |
53,775 |
840 ft. lbs. |
87,225 |
1363 ft. lbs. |
105,400 |
1600 ft. lbs. |
|
1-1/4-12 (UNF) |
59,550 |
930 ft. lbs. |
96,600 |
2012 ft. lbs. |
116,700 |
1750 ft. lbs. |
Grade
5
Grade
8
Grade
L9*Above values are for zinc plated nut and bolt assemblies. Increase torque by 33% if using unplated
(dry, unlubricated) nut and bolt assemblies. Decrease torque by 45% if using lubricants (oil, grease,
or antisieze lubricants).