Bolt Pull Force at Max Torque
A-9
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.
SHCS SIZE
Max Recommended Torque (N-m)
Pull Force (kN) Generated at Max Recommended Torque
M4 M5 M6 M8
6
9
12 20 49 98
15 22 39 62 87
M10 M12 M14 M16 M20 M24
165 265 413 825
120 163 261
(
) Your Torque (N -m)
Pull Force Generated at Max Torque (kN)
Force in your application =
X
Max Torque from Table (N - m)
1425 375 Max recommended torque based with thermal black finish and light oil.
Example: A M6 SHCS is being torqued to 10 Nm, what pull force is generated? From the table, the max torque for a M6 SHCS is 20 N-m and the pull force generated is 22 kN. Enter these values along with your torque into the equation above.
( ) 10 N-m 20 N-m
22 kN = 11 kN X
( 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 (kN) = Pressure (kpa) Piston Area (m 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 )
Pull Force =
The Pull Force is 11 kN when a M6 SHCS is torqed to 10 N-m
Torque Applied
Clamp Force Output From Strap Clamps BOLT FORCE 40 KN BOLT FORCE 40 KN
Bolt Pull Force
CLAMP FORCE 20 kN
CLAMP FORCE 20 kN
CLAMP FORCE 27 kN
CLAMP FORCE 13 kN
2/3
1/2
1/3
1/2
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