The trapezoidal thread is comparable into the acme thread, besides which the thread angle is 300. It truly is created in metric dimensions; that's why it can be known as "metric lead screw" or "metric acme screw." Square- Square recess screws Have got a square-formed socket in the center from https://types-of-plumbing-repair63838.dsiblogger.com/62218334/a-review-of-lead-screw-thread