Cross Recessed Head Tapping Screws are threaded fasteners with a coarse thread and a cross recessed drive head. Metric Tapping screws are suitable for use in an unthreaded hole and can be driven with a Phillips screw driver. Tapping Screws are also sometimes called sheet metal screw. Cross Recessed Tapping Screws can be used for fastening objects to thin metal, wood or plastic.
Self-tapping screws have very sharp threads that cut their threads into the material they are being inserted. These have a very sharp point, especially in contrast with a self-drilling screw. Self-tapping screws are often called sheet metal screws or zip screws and abbreviated SMS.
