Phillips-drive countersunk head machine screw with a conical head that sinks into the workpiece to produce a flat finished surface. It uses standard machine thread suitable for mating with nuts or tapped internal threads. Metric and UNC/UNF imperial sizes are available.

Parts are offered in carbon steel and stainless steel with surface treatments that include zinc plating and black oxide. Common applications include electrical equipment, cabinets, instruments, furniture and sheet‑metal assembly. Confirm required standard, size, material and finish when specifying or ordering.