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SUGGESTED TORQUE VALUES
 & CLAMP LOADS

For reference only.  
On Critical Applications consult the Manufacturer of the component or item

     
HEX HEAD CAP SCREWS

(To convert in-lbs to ft-lbs simply divide by 12)
(To convert ft-lbs to in-lbs simply multiply by 12)

Nominal
Size
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)
1/4"-28 .0363 1200-1800 47-65 1855-2782 72-100 2619-3928 107-142
1/4"-20 .0318 1050-1575 41-57 1622-2432 65-88 2291-3437 93-129
5/16"-24 .0580 1914-2871 93-129 2961-4441 144-200 4180-6270 212-294
5/16"-18 .0524 1729-2594 84-117 2674-4011 130-18O 3775-5662 199-265
3/8"-24 .0878 2897-4346 169-234 4479-6719 262-363 6324-9486 384-534
3/8"-16 .0774 2557-3836 150-207 3952-5928 231-320 5579-8369 339-471
7/16"-20 .1187 3917-5876 267-370 6054-9080 413-572 3546-12820 606-841
7/16"-14 .1063 3508-5262 239-331 5421-8132 370-512 7654-11480 542-753
Nominal
Size
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)
1/2"-20 .1599 5278-7917 412-570 8151-12236 53-73 11516-64746 81-103
1/2"-13 .1419 4683-7024 365-506 7237-10855 47-65 10217-15325 72-96
9/16"-18 .2029 6698-10048 49-68 10356-15528 76-105 14615-21922 115-154
9/16"-12 .1731 5714-8571 42-58 9279-13319 68-90 13100-19651 103-138
5/8"-18 .2559 8446-12670 63-95 13053-19580 106-147 18428-27643 175-233
5/8"-11 .2260 7458-11187 61-84 11526-17289 94-130 16277-24408 143-191
3/4"-16 .3729 12392-18373 185-257 19021-28531 185-257 26853-40280 284-378
3/4"-10 .3344 11037-16555 108-149 17055-25582 166-230 24081-36122 254-338
1"-12 .6630 13149-19703 164-247 33815-50722 440-609 47739-71608 670-894
1"-8 .6060 12010-17994 150-225 30892-46339 402-566 43613-65420 619-817
1-1/8"-12 .8562 16948-25423 238-357 38006-57009 534-801 61632-92448 866-1300
1-1/8"-7 .7531 15107-2261 212-318 33877-50816 476-714 54936-82404 772-1158
1-1/4"-12 1.0734 21245-31868 332-498 47641-71462 744-1116 77256-115884 1207-1810
1-1/4"-7 .9646 19186-28719 300-450 43023-64535 672-1008 69768-104652 1090-1635

 

   
Standard Steel Bolt Torque Specifications
(To convert in-lbs to ft-lbs simply divide by 12)
(To convert ft-lbs to in-lbs simply multiply by 12)

(For reference only.  On Critical Applications consult the Manufacturer of the component or item)

Bolt Size
(in.)
Standard Dry Torque in Foot-Pounds
SAE
Grade 2
74,000 psi
Low Carbon
Steel
SAE
Grade 5
120,000 psi
Med. Carbon
Heat T. Steel
SAE
Grade 8
150,000 psi
Med. Carbon
Alloy Steel
1/4-20
6
10
14
5/16-18
12
19
29
3/8-16
20
33
47
7/16-14
32
54
78
1/2-13
47
78
119
9/16-12
69
114
169
5/8-11
96
154
230
3/4-10
155
257
380
7/8-9
206
382
600
1-8
310
587
700
1-1/8 -7
480
794
1430
1-1/4 -7
375
1105
1975
1-3/8 -6
900
1500
2650
1-1/2 -6
1100
1775
3200
1-5/8 -5.5
1470
2425
4400
1-3/4 -5
1900
3150
5650
1-7/8 -5
2360
4200
7600
2 -5
2750
4550
8200

 

Metric Steel Bolts Torque Specifications

Bolt Size
Standard Dry Torque in Foot-Pounds
Standard 5D
71,160 psi
Med. Carbon Steel
Standard 8G
113,800 psi
Med. Carbon Steel
Standard 10K
142,000 psi
Med. Carbon Steel
Standard 12K
170,674 psi
Med. Carbon Steel
6mm x 1.00
5
6
8
10
8mm x 1.00
10
16
22
27
10mm x 1.25
31
40
45
49
12mm x 1.25
34
54
70
86
14mm x 1.25
55
89
117
137
16mm x 2.00
83
132
175
208
18mm x 2.00
111
182
236
283
22mm x 2.50
182
284
394
464
24mm x 3.00
261
419
570
689