SELF LOCK NUT/Nylon, Steel, Cadmium plated, short, 4-40 MS21083N04 pack of 100Self-Locking Hexagon Nut | Nylon Insert, 4-40, Steel, Thin HeightThe hexagonal self-locking nut contains a nylon insert. Made from carbon steel with cadmium type II finish per QQ-P-416. MS21083 series nut.4-40Thin heightCa..