Machine screw with Phillips drive and countersunk head. The conical head sinks fully into the workpiece surface to achieve a flat appearance after installation. Equipped with standard machine thread, matched with nuts or tapped internal threads. Made of carbon steel and stainless steel. Surface treatments include zinc plating, black oxide. Metric and UNC/UNF imperial sizes available. Commonly used for electrical equipment, cabinets, instruments, furniture and sheet metal assembly.