Commonly used with flat or lockwashers.
5/16"-18 x 3 in Slotted Round Machine Screw, Plain Brass, 4 PK Machine screws are used in fastening nearly all types of hard materials.. A machine screw, also called a stove bolt, is generally a smaller fastener threaded the entire length of its shank. Especially useful in metal-to-metal or where heavy duty fastening is required.