20
Nominal
Thread Size
Grade 2
Grade 5
Grade 8
Clamping
Load
Tightening
Torque
Clamping
Load
Tightening
Torque
Clamping
Load
Tightening
Torque
Coarse Thread
1/4
-
20
1,300 lbs
65 in
-
lbs
2,000 lbs
100 in
-
lbs
2,850 lbs
143 in
-
lbs
5/16
-
18
2,150 lbs
134 in
-
lbs
3,350 lbs
210 in
-
lbs
4,700 lbs
305 in
-
lbs
3/8
-
16
3,200 lbs
20 ft
-
lbs
4,950 lbs
31 ft
-
lbs
6,950 lbs
44 ft
-
lbs
7/16
-
14
4,400 lbs
30 ft
-
lbs
6,800 lbs
50 ft
-
lbs
9,600 lbs
70 ft
-
lbs
1/2
-
13
5,850 lbs
49 ft
-
lbs
9,050 lbs
75 ft
-
lbs
12,800 lbs
107 ft
-
lbs
9/16
-
12
7,500 lbs
70 ft
-
lbs
11,600 lbs
109 ft
-
lbs
16,400 lbs
154 ft
-
lbs
5/8
-
11
9,300 lbs
97 ft
-
lbs
14,500 lbs
151 ft
-
lbs
20,300 lbs
211 ft
-
lbs
3/4
-
10
13,800 lbs
173 ft
-
lbs
21,300 lbs
266 ft
-
lbs
30,100 lbs
376 ft
-
lbs
7/8
-
9
11,425 lbs
166 ft
-
lbs
29,435 lbs
430 ft
-
lbs
41,550 lbs
606 ft
-
lbs
1
-
8
15,000 lbs
250 ft
-
lbs
38,600 lbs
640 ft
-
lbs
54,540 lbs
900 ft
-
lbs
Fine Thread
1/4
-
28
1,500 lbs
75 in
-
lbs
2,300 lbs
115 in
-
lbs
3,250 lbs
163 in
-
lbs
5/16
-
24
2,400 lbs
150 in
-
lbs
3,700 lbs
230 in
-
lbs
5,200 lbs
325 in
-
lbs
3/8
-
24
3,600 lbs
23 ft
-
lbs
5,600 lbs
35 ft
-
lbs
7,900 lbs
50 ft
-
lbs
7/16
-
20
4,900 lbs
36 ft
-
lbs
7,550 lbs
55 ft
-
lbs
10,700 lbs
78 ft
-
lbs
1/2
-
20
6,600 lbs
55 ft
-
lbs
10,200 lbs
85 ft
-
lbs
14,400 lbs
120 ft
-
lbs
9/16
-
18
8,400 lbs
79 ft
-
lbs
13,000 lbs
112 ft
-
lbs
18,300 lbs
172 ft
-
lbs
5/8
-
18
10,600 lbs
110 ft
-
lbs
16,300 lbs
170 ft
-
lbs
23,000 lbs
240 ft
-
lbs
3/4
-
16
15,400 lbs
193 ft
-
lbs
23,800 lbs
298 ft
-
lbs
33,600 lbs
420 ft
-
lbs
7/8
-
14
12,610 lbs
184 ft
-
lbs
32,480 lbs
473 ft
-
lbs
45,855 lbs
668 ft
-
lbs
