Plate nut assembly for fastening an instrument to a wall, has protrusion around threaded whose height decreases as protrusion is farther from around the threaded hole

摘要

A protrusion (5) is formed on one side of a nut (3) around the threaded hole (2) whose height decreases as the protrusion is farther from around the threaded hole. A recess is formed around the threaded hole on the other side of the nut, the recess having opposed inclined end walls.