A machine screw is a fastening screw with a machine-cut thread throughout the length of its shank. Occasionally, they're also called Stove Bolts. Typically, they're threaded through preexisting, tapped holes. Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten various components together in machines, electronics, tools, etc. Fasten with a screwdriver to reduce risk of over-tightening and protect the screw and fastened material. If nuts are needed, use with nuts of the same finish and threading for proper fit. For flat heads, the length of a machine screw is measured from the head to the point of the screw.