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Bolt
Torque Information
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Hex
Cap Screw Torques and Clamp Loads
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SUGGESTED
TORQUE VALUES AND CLAMP LOADS
GRADES 2, 5, & 8 CAP SCREWS
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Nominal
Size |
Threads/Inch |
Tensile
Stress
Area
(sq. in) |
Grade
2 |
Grade
5 |
Grade
8 |
Clamp
Load
(lb) |
Tightening
Torque
(in-lb) |
Clamp
Load
(lb) |
Tightening
Torque
(in-lb) |
Clamp
Load
(lb) |
Tightening
Torque
(in-lb) |
| .250 |
28 |
.0363 |
1200-1800 |
47-65 |
1855-2782 |
72-100 |
2619-3928 |
107-142 |
| 20 |
.0318 |
1050-1575 |
41-57 |
1622-2432 |
65-88 |
2291-3437 |
93-129 |
| .3125 |
24 |
.0580 |
1914-2871 |
93-129 |
2961-4441 |
144-200 |
4180-6270 |
212-294 |
| 18 |
.0524 |
1729-2594 |
84-117 |
2674-4011 |
130-18O |
3775-5662 |
199-265 |
| .375 |
24 |
.0878 |
2897-4346 |
169-234 |
4479-6719 |
262-363 |
6324-9486 |
384-534 |
| 16 |
.0774 |
2557-3836 |
150-207 |
3952-5928 |
231-320 |
5579-8369 |
339-471 |
| .4375 |
20 |
.1187 |
3917-5876 |
267-370 |
6054-9080 |
413-572 |
3546-12820 |
606-841 |
| 14 |
.1063 |
3508-5262 |
239-331 |
5421-8132 |
370-512 |
7654-11480 |
542-753 |
| .500 |
20 |
.1599 |
5278-7917 |
412-570 |
8151-12236 |
53-73
(ft-Ib) |
11516-64746 |
81-103
(ft-lb) |
| 13 |
.1419 |
4683-7024 |
365-506 |
7237-10855 |
47-65
(ft-lb) |
10217-15325 |
72-96
(ft-lb) |
Nominal
Size |
Threads/Inch |
Tensile
Stress
Area
(sq. in) |
Clamp
Load
(lb) |
Tightening
Torque
(ft-lb) |
Clamp
Load
(lb) |
Tightening
Torque
(ft-lb) |
Clamp
Load
(lb) |
Tightening
Torque
(ft-lb) |
| .5625 |
18 |
.2029 |
6698-10048 |
49-68 |
10356-15528 |
76-105 |
14615-21922 |
115-154 |
| 12 |
.1731 |
5714-8571 |
42-58 |
9279-13319 |
68-90 |
13100-19651 |
103-138 |
| .625 |
18 |
.2559 |
8446-12670 |
63-95 |
13053-19580 |
106-147 |
18428-27643 |
175-233 |
| 11 |
.2260 |
7458-11187 |
61-84 |
11526-17289 |
94-130 |
16277-24408 |
143-191 |
| .750 |
16 |
.3729 |
12392-18373 |
185-257 |
19021-28531 |
185-257 |
26853-40280 |
284-378 |
| 10 |
.3344 |
11037-16555 |
108-149 |
17055-25582 |
166-230 |
24081-36122 |
254-338 |
| 1.000 |
12 |
.6630 |
13149-19703 |
164-247 |
33815-50722 |
440-609 |
47739-71608 |
670-894 |
| 8 |
.6060 |
12010-17994 |
150-225 |
30892-46339 |
402-566 |
43613-65420 |
619-817 |
| 1.125 |
12 |
.8562 |
16948-25423 |
238-357 |
38006-57009 |
534-801 |
61632-92448 |
866-1300 |
| 7 |
.7531 |
15107-2261 |
212-318 |
33877-50816 |
476-714 |
54936-82404 |
772-1158 |
| 1.250 |
12 |
1.0734 |
21245-31868 |
332-498 |
47641-71462 |
744-1116 |
77256-115884 |
1207-1810 |
| 7 |
.9646 |
19186-28719 |
300-450 |
43023-64535 |
672-1008 |
69768-104652 |
1090-1635 |
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