Self clinching fasteners are devices, usually threaded , when pressed into a ductile metal displaces the host material around the mounting hole. This action causes the meal to cold flow into the specially designed annular recess in the shank or pilot of the fastener. A serrated clinching ring or ,ribs or hex head prevents the fastener from rotating in the host material once it has been properly installed. The self clinching fastner becomes an integral part of the host bracket or assembly into which they are installed. The sheet remains flush on one side, and the fastener is permanently locked in place.