Hi all, I would like to know how to design a thread/screw to induce a specific stress on an object. What I have in numerical data is the stress itself that is required. The application is very similar to that of a threaded car jack. By turning the thread, it will lift up the load that was placed on the jack. In my case, what I have is a cylindrical structure with 4 threads (which I need to design) placed parallel and symmetrically around the cylinder. These threads will be strapped onto the cylinder so that by turning a nut on each of the threads, it will put the cylinder into tension and eventually stretch it apart. I would like to know if anyone here is familiar with such thread design to get me started on this project. I apologize for the poor explanation as it is quite difficult without a visual diagram. Thank you!