The trapezoidal thread is comparable to the acme thread, other than which the thread angle is 300. It truly is created in metric dimensions; that is definitely why it is called "metric lead screw" or "metric acme screw." Especially purposes and selected areas, threads apart from the ISO metric screw https://gunnerkuchn.wizzardsblog.com/29394425/not-known-factual-statements-about-types-of-screw-heads-torx