They are frequently used in machinery and appliances.
.0 X 20MMFlat Head, Phillips DriveUse with nuts or pre-threaded holes of the same diameter & thread sizeOften used in machinery & appliancesNuts and washers not includedThread Type: Coarse, Thread Class: 6G, Point Style: BluntSpecification(s) Met: DIN 965 Machine screws have a uniform diameter along their entire length and are designed to screw into threaded holes or to be used in combination with machine screw hex nuts.Machine Screw, Metric, Flat Head, Phillip Drive M6-1.