Diameter: #6 Length: 1-1/4 Material: Stainless Steel Head Style: Oval (Phillips) Thread Size: 32 (Coarse) Thread Length: Full Hardness: 18-8 Type: Machine Screw A machine screw also called a stove bolt is generally a smaller fastener threaded the entire length of its shank. Machine screws are used in fastening nearly all types of hard materials. Especially useful in metal-to-metal or where heavy duty fastening is required. Commonly used with flat or lockwashers.