![]() There are exceptions for instance, carriage bolts have a domed head that is not designed to be driven set screws often have a head smaller than the outer diameter of the screw J-bolts have a J-shaped head which is not designed to be driven, but rather is usually sunk into concrete allowing it to be used as an anchor bolt. The head is usually larger than the body of the screw, which keeps the screw from being driven deeper than the length of the screw and to provide a bearing surface. ![]() Common tools for driving screws include screwdrivers and wrenches. A screw will almost always have a head on one end which contains a specially formed shape that allows it to be turned, or driven, with a tool. The most common uses of screws are to hold objects together and to position objects. ![]() Other screw threads are designed to cut a helical groove in a softer material as the screw is inserted. 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. ![]() 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.
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