Disc Nut! Will these threads strip?

[canbu]

I'm dealing with a material change of a disc nut to be made of 630 AL-BRZ(Yield Stress-40000 PSI). The Nut is 2-(7/8)"-12UNC. At max shear stress, what is the max force and torque that can be applied to threads before failure.
Nut height-1-(5/8)"

 

[CoryPad]

If you want max force/torque, you need to provide ultimate strength (shear is best, tensile if that is all you have).

 

[arto]

check out the formulae in ASME B1.1-1989 "Unified Inch Screw Threads," App. B for thread strength

 

[canbu]

I have a tensile strength of 90 ksi. The problem is were changing from NIALBRZ to 630 Alumnium Bronze which is slightly weaker.