Machine screws are used with a pre-tapped hole or nut wherever a removable fastener is needed in metal or plastic assemblies — including electrical panels, switchboards, brackets, and industrial equipment. Part number CMS50. Champion machine screws are supplied in a range of head styles and drive recesses. Where this tool is used Electrical switchboards, instrument panels, industrial equipment housings, brackets, and precision assemblies requiring a machine-thread fastener. General maintenance and workshop applications. Key specifications Specification Detail Head type Countersunk Drive Phillips Selecting the right option Confirm thread pitch and size before ordering — mixing metric and imperial threads is a common site error.