A screw, or bolt, is a type of fastener, typically made of metal, and characterized by a helical ridge, known as a male thread(external thread) or just thread, wrapped around a cylinder. It is an inclined plane wrapped around a nail. Some screw threads are designed to mate with a complementary thread, known as a female thread (internal thread), often in the form of a nut or an object that has the internal thread formed into it. Other screw threads are designed to cut a helical groove in a softer material as the screw is inserted. The most common uses of screws are to hold objects together and to position objects.
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