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Reference Tables -- Hex Cap Screws Torque Specifications

Bolt Torque Information
Hex Cap Screw Torques and Clamp Loads



SUGGESTED TORQUE VALUES AND CLAMP LOADS
GRADES 2, 5, & 8 CAP SCREWS

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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