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link to reference source site

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

 

 

 


God Bless America

Fairbury Fastener
23092 E. 800 North Rd. / U.S. Rt 24 East
Fairbury, IL 61739
Phone:  (815) 692-3848
  
FAX:  (815) 692-2200
E- Mail: 
sales @ fairbury fastener . com

Call 815-692-3848
to place your order

We do NOT process international orders.  Prices are subject to change and may be different than shown on our site.  
Call for current pricing.
 All Returns subject to restocking.

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