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U.S. Bolt Torque Specifications
U.S. BOLT GRADES
|
2 |
5 |
7 |
8 |
SOCKET HEAD CAP SCREW |
| I.D. Marks |
No markings |
3 lines |
5 lines |
6 lines |
Allen head |
| Material |
Low carbon |
Medium-carbon, tempered |
Medium-carbon,
quenched & tempered |
Medium-carbon, quenched & tempered |
High-carbon, quenched & tempered |
| Tensile strength (Minimum) |
74,000 psi |
120,000 psi |
133,000 psi |
150,000 psi |
160,000 psi |
U.S. Bolt Torque Specifications
Torque in pounds-foot
|
|
2 |
2 |
5 |
5 |
7 |
7 |
8 |
8 |
Socket head cap screw |
Socket head cap screw |
| Bolt Dia. |
Thread per inch |
Dry |
Oiled |
Dry |
Oiled |
Dry |
Oiled |
Dry |
Oiled |
Dry |
Oiled |
| 1/4 |
20 |
4 |
3 |
8 |
6 |
10 |
8 |
12 |
9 |
14 |
11 |
| 1/4 |
28 |
6 |
4 |
10 |
7 |
12 |
9 |
14 |
10 |
16 |
13 |
| 5/16 |
18 |
9 |
7 |
17 |
13 |
21 |
16 |
25 |
18 |
29 |
23 |
| 5/16 |
24 |
12 |
9 |
19 |
14 |
24 |
18 |
29 |
20 |
33 |
26 |
| 3/8 |
16 |
16 |
12 |
30 |
23 |
40 |
30 |
45 |
35 |
49 |
39 |
| 3/8 |
24 |
22 |
16 |
35 |
25 |
45 |
35 |
50 |
40 |
54 |
44 |
| 7/16 |
14 |
24 |
17 |
50 |
35 |
60 |
45 |
70 |
55 |
76 |
61 |
| 7/16 |
20 |
34 |
26 |
55 |
40 |
70 |
50 |
80 |
60 |
85 |
68 |
| 1/2 |
13 |
38 |
31 |
75 |
55 |
95 |
70 |
110 |
80 |
113 |
90 |
| 1/2 |
20 |
52 |
42 |
90 |
65 |
100 |
80 |
120 |
90 |
126 |
100 |
| 9/16 |
12 |
52 |
42 |
110 |
80 |
135 |
100 |
150 |
110 |
163 |
130 |
| 9/16 |
18 |
71 |
57 |
120 |
90 |
150 |
110 |
170 |
130 |
181 |
144 |
| 5/8 |
11 |
98 |
78 |
150 |
110 |
140 |
140 |
220 |
170 |
230 |
184 |
| 5/8 |
18 |
115 |
93 |
180 |
130 |
210 |
160 |
240 |
180 |
255 |
204 |
| 3/4 |
10 |
157 |
121 |
260 |
200 |
320 |
240 |
380 |
280 |
400 |
320 |
| 3/4 |
16 |
180 |
133 |
300 |
220 |
360 |
280 |
420 |
320 |
440 |
350 |
| 7/8 |
9 |
210 |
160 |
430 |
320 |
520 |
400 |
600 |
460 |
640 |
510 |
| 7/8 |
14 |
230 |
177 |
470 |
360 |
580 |
440 |
660 |
500 |
700 |
560 |
| 1 |
8 |
320 |
240 |
640 |
480 |
800 |
600 |
900 |
680 |
980 |
780 |
| 1 |
12 |
350 |
265 |
710 |
530 |
860 |
666 |
990 |
740 |
1060 |
845 |
BOLT TORQUE FACTORS
| LUBRICANT OR PLATING |
TORQUE CHANGES |
| Oil |
Reduce torque 15% to 25% |
| Dry Film (Teflon or moly based) |
Reduce torque 50% |
| Dry Wax (Cetyl alcohol) |
Reduce torque 50% |
| Chrome plating |
No change |
| Cadmium plating |
Reduce torque 25% |
| Zinc plating |
Reduce torque 15% |
|
