Screws, including: Archimedes' Screw, Screwdriver, Henry F. Phillips, Tap And Die, Torx, Unified Thread Standard, P. L. Robertson, Bolted Joint, Hex ... Thread, Set Screw, British Standard Whitworth

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More info: A screw, or bolt, is a type of fastener characterized by a helical ridge, known as an external thread or just thread, wrapped around a cylinder. Some screw threads are designed to mate with a complementary thread, known as an 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.