Clips
Metal nuts, with single thread, to snap on (NU/SNU type)
These parts have a thread formed in the sheet metal. They are snapped on the edge of a panel, where they are clipped over a hole.
Metal threaded chimney nuts, to snap on (NUT type)
These parts have a threaded chimney formed in the sheet metal. They are snapped on the edge of a panel, where they are clipped over a hole.