Determining tightening torque
Modeling and calculating screw joints
Article REF: BM5560 V1
Determining tightening torque
Modeling and calculating screw joints

Author : Jean GUILLOT

Publication date: July 10, 2007 | Lire en français

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2. Determining tightening torque

To make a bolted joint, a torque wrench is generally used to apply a driving torque C to the nut (or screw head) (figure 8 ). Equal resisting torque of opposite sign results from the action on the nut of the contact forces of the screw threads and the assembled parts (or washer).

We can write :

C = C 1 + C 2

with :

C 1
 : 
torque due to contact forces of screw threads on nut
C ...
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