Screw

A screw is a cylindrical metal product consisting of a head and a shank with external threads. It is fastened and connected with two or more parts by cooperating with a nut or directly screwing into the threaded hole of a part. By utilizing the frictional force and mechanical interlocking effect of the threads, it keeps these parts in a relatively fixed position relationship, so as to achieve the purposes of connection,A fastening, positioning, etc. Screws are widely used in many fields such as machinery manufacturing, construction, electronics, and so on.