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RE: Thread shear

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Assuming you are talking about how much the nut has to grab onto the thread,
a rule of thumb would be to have at least 1 
diameter of thread sticking out past the nut.  I generally call for 2 bolt
diameters of thread from the underside of the washer, giving a bit of
leeway.

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help ! 

what length of thread is required to develop the full tension of a grade 5
bolt (3/8" diam specifically). 
is this a simple rule of thumb or must one figure the total shear plane
area, etc etc? 

tia