What Causes a Stud Bolt Tensioner to Loosen

How Will a Stud Bolt Tensioner Fail?

Often fatigue failure is a result of the stud bolt self-loosening which reduces the clamp force acting on the joint. Joint slip then occurs which leads the bolt being subjected to bending loads and subsequently failing by fatigue.

Stud Bolt Tensioner are manufactured in such a way that the bolt shank will fail first before the threads strip, this just means that the full strength of the thread can ride out forces greater than what would be necessary to fracture the actual bolt shank. But for it to actually be fractured, there must be a minimum amount of bolt thread “engaging” the nut, known as minimum thread engagement.

By a detailed analysis of the joint, it is possible to determine the clamp force required to be provided by the bolts to prevent joint slip.

What is the Preload of a Stud Bolt Tensioner?

For the most part stud bolts don’t face the above problem due to the ability to produce what is called a clamping load, or a preload, which if large enough, will ensure joint integrity. The preload is the force that is created when torque is applied to a bolt to fasten two or more objects together. The Bolt Tensioner ​is pulled into tension as torque is applied, while the fastened parts experience compression.

This tension, as long as it’s within the elastic limit of the bolt, exerts an equal and opposite force called the tensile stress which works to keep the bolt from loosening.

Bolt Tensioner range from the most common household types to specialty types.Check out the website that specializes in wrenches at https://www.atwwren.com for details.
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