Insert nut

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An insert nut, or knock in nut, provides a threaded socket for a wooden work piece, similar to a wall anchor. Insert nuts are inserted into a pre-drilled hole by one of two means: screw in and hammer in. Screw-in insert nuts have an external thread and hex head and are screwed in with an Allen wrench. Hammer-in insert nuts are lined with barbes and are hammered in. In both cases, the external protrusions bite into the wood, preventing the nut from either turning or pulling out. Insert nuts should not be confused with barrel nuts or T-nuts, which require that the working piece be drilled through and are fastened behind the work piece.