Stretch Control
As we demonstrated earlier with the joint diagrams, when we apply torque to a bolt or nut, it turns, which stretches the bolt and creates a preload or tension in our fastener. This tension creates the clamping force, which holds our joint together. If the joint is considered to be critical, we will want to ensure that the
proper amount of tension has been created in our joint upon tightening of the bolt, and that the tension remains in our fastener even after tightening of neighboring bolts and the relaxation of the fastener has occurred.
