Hello everyone. I have been trying to determine the tensile force needed to rip a threaded tube out of its female threaded socket. After some Google searching, I found this: http://www.engineersedge.com/thread_strength/thread_bolt_stress.htm I used shear area, which I believed to be an "equivalent" cross-sectional area of a bolt, and multiplied by the ultimate strength of the material to calculate force necessary for failure. However, my numbers ended up being way too high. Perhaps I misunderstood the meaning of shear area; this calculation would not work if shear area is not perpendicular to the axial force that I am trying to get. I have looked around for other ways of solving my problem, but haven't had much luck, and so decided to post here for some inspiration. Any advice would be appreciated. Thanks in advance!