Screws Range

A Screw, is a type of fastener characterized by a helical ridge, known as an external thread or just thread, wrapped around a cylinder. 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. Often screws have a head, which is a specially formed section on one end of the screw that allows it to be turned, or driven. Common tools for driving screws include screwdrivers and wrenches. 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. The cylindrical portion of the screw from the underside of the head to the tip is known as the shank; it may be fully threaded or partially threaded.

ASME standards specify a variety of �Machine Screws� in diameters ranging up to 0.75 inches. These fasteners are often used with nuts and they are often driven into tapped holes. In practice, they tend to be mostly available in smaller sizes and the smaller sizes are referred to as screws or less ambiguously as machine screws.