This refers to a nut that can be attached using a dedicated tool in one direction without welding the nut. It is sold under various names such as insert nuts, blind nuts, pop nuts, and rivet nuts.

This product is used to attach the screw to the outer surface of the cylinder and secure the part. In general, nuts are hexagonal in shape, including tetragonal or octagonal, and depending on their shape, there are various nuts such as butterfly nuts and insert nuts.