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We often touch screws, screws and other fasteners, but do you really understand screws? Do you know the difference between the threads on the screws? Come on,we to fight illiteracy.
by admin on 22-08-26
What is a thread? A thread is a shape with uniform spiral lines on the section of the outer or inner surface of a solid. 1. Shape of section Screw threads according to its cross section shape (tooth type) into triangular thread, rectangular thread, trapezoidal thread and serrated thread, etc. Tri...
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