Bolt Engagement and Shear Forces

[will07]

How would i go about calc the amount of thread engagement needed on a 5/16 NC grade 8 bolt with 3800 lbs againest it on a 90 degree angle?

 

[CoryPad]

Thread engagement calculation is based on the axial loading of the joint. If your joint is only loaded transversely, then the screw preload is the only axial load. It is best to assume that the screw may be accidentally overtightened, and use the screw's tensile strength as the upper limit. Then, calculate the required thread engagement based on the shear strength of the internally threaded part. thread725-35222 has equations to use.

Regards,

Cory

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