Rivet Nut, #6-32 Thread Size, 1/2 in L, Rubber, 10 PK, Midwest Fastener, Mfr#: 64541

A well nut is a type of fastener used to blindly fasten a piece and to seal the bolt hole. It consists of a flanged neoprene bushing with a nut embedded in the non-flanged end. The bolt is passed through one of the pieces to be fastened and threaded onto the nut from the flanged end.