Screws is a mechanical fastener having threaded cylindrical or tapered shaft used to engage parts with threads. Screws with tapered shaft are self-threading means thread cuts into the material while the screw is turned.
Screws are threaded fasteners that create permanent or temporary assemblies. They are inserted and removed by turning in one direction or another. Wood screws, floor screws, and sheet metal screws have flat heads that sit flush when holding material together.