- #1

cmarentes89

- 4

- 1

- TL;DR Summary
- At what forces and thread engagement will my threads shear or strip.

Hello all,

So I've attached two images, one is the spread-sheet that I'm working on and the other is an image of the formulas that I'm using. I'm a bit confused on how length of engagement works for those formulas. So for 3 1/4-8UN-2A threads, with a shear strength of 44.5 KSI, the minimum length of engagement should be about 2.68 inches. From that, I understand that my engagement length should be 2.68 inches to avoid any thread stripping and/or shearing. But what if I use 1.00 inches of thread engagement engagement? The formulas shows that it would not strip when I compare the forces required and actual to strip the threads.... My ultimate goal is to determine a shear safety of factor and the minimum length of engagement at any applied pressure.

So I've attached two images, one is the spread-sheet that I'm working on and the other is an image of the formulas that I'm using. I'm a bit confused on how length of engagement works for those formulas. So for 3 1/4-8UN-2A threads, with a shear strength of 44.5 KSI, the minimum length of engagement should be about 2.68 inches. From that, I understand that my engagement length should be 2.68 inches to avoid any thread stripping and/or shearing. But what if I use 1.00 inches of thread engagement engagement? The formulas shows that it would not strip when I compare the forces required and actual to strip the threads.... My ultimate goal is to determine a shear safety of factor and the minimum length of engagement at any applied pressure.