Bolt Pull Force at Max Torque
Max Recommended Torque (ft-lbs)
Pull Force (lbs) Generated at Max Recommended Torque
A-9
SHCS Sizes
UNRC UNRF
UNRC
UNRF
Are you using a bolt as a clamp on your manual fixture and want to know how much clamping force is being produced? Follow these instructions to calculate the bolt pull force in your application. Step 1 What is your bolt size and torque? Step 2 Look in the table to find the max recommended torque and pull force of your bolt size.
#6 #8
3 5 7
3 5 8
1397 2146 2662 5106 8449
1576 2258 3023 5850 9332
#10
1/4
17 35 62 99
19 38 70
5/16
3/8
12535 17259 22817 34421 50556 59531 78875
14263 18302 26091 38353 56719 66225 81864
7/16
109 172 317 563 767
1/2 5/8 3/4 7/8
150 283 500 688
(
) Your Torque (ft - lbs) Max Torque from Table (ft - lbs)
Pull Force Generated at Max Torque (lbs)
Force in your application =
X
1
1042 1083
M4 M5 M6 M8
4 9
2102 3440 4847 8716
Example: A 3/8-16 bolt is being torqued to 50 ft-lbs, what pull force is generated? From the table, the max torque for a 3/8 UNRC is 62 ft-lbs and the pull force generated is 12,535 lbs. Enter these values along with your torque into the equation above. 50 ft-lbs 62 ft-lbs 12,535 lbs = 10,109 lbs ( ) X The Pull Force is 10,109 lbs when a 3/8-16 bolt is torqed to 50 ft-lbs. Pull Force =
15 36 72
M10 M12 M14 M16 M20 M24
13908 19592 26938 36676 58572
122 195 305 608
Clamp Force Output From Strap Clamps BOLT FORCE 9,000 lbs BOLT FORCE 9,000 lbs 1051 84252 Max recommended torque for bolts with thermal black finish and light oil. How do I choose a cylinder that produces the same force as my bolt? Sizing a hydraulic cylinder to produce the same pull force as a bolt force is easy, it’s simple physics: Force (lbs) = Pressure (psi) Piston Area (in 2 ) By varying pressure and area, any force can be produced. See the Cylinder or Push/Pull Cylinder sections for the many cylinder options Vektek provides. ( x )
Torque Applied
Bolt Pull Force
CLAMP FORCE 6,000 lbs
CLAMP FORCE 3,000 lbs
CLAMP FORCE 4,500 lbs
CLAMP FORCE 4,500 lbs
2/3
1/2
1/3
1/2
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