Black Oxide Screws with Nylon Patch and Washers

This article is about the fastener. For the screw as a mechanism, see Screw (simple machine). For other uses, see Screw (disambiguation). An assortment of screws A bolt (with a nut) and a screw  A screw and a bolt (see Differentiation between bolt and screw below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a male thread (external thread). Screws and bolts are used to fasten materials by the engagement of the screw thread with a similar female thread (internal thread) in a matching part. Screws are often self-threading (also known as self-tapping) where the thread cuts into the material when the screw is turned, creating an internal thread that helps pull fastened materials together and prevents pull-out. There are many screws for a variety of materials; materials commonly fastened by screws include wood, sheet metal, and plastic.  TS Hardware is an ISO9001:2015 certified company and a Master manufacturer & distribu…