Self-Clinching nuts provide a strong female thread in panels that are too thin to be conventionally tapped. They are installed by placing them in properly pre-cut holes in sheets and applying enough force for metal to cold flow into an undercut.
This allows the nut to be integrated into the sheet with a strong bond, but installs flush on the underside of the panel. The serrated ring prevents the nut from rotating and they have excellent torque and push out characteristics.