Hi,
I am designing a closure for a thick walled pressure vessel.
The closure is to be held in place by 4.75-4 ACME threads.
I have found a formula in the Machinery's handbook 28th edition. Page 1828. For the shear area of acme threads.
Shear area= 3.1416 D1max [ 0.5 + n tan(14.5°)(D2 min - D1...