531300201 is a nickel plated brass dress nut designed for use with Y, H & A Series switchlocks. It features a 3/4-24 UNS-2B thread and an outer diameter of 1.003 inches (25.48 mm) with an inner diameter of 0.550 inches (13.97 mm). The dress nut is manufactured from brass with a nickel plated finish as standard. This hardware component is commonly used for panel mounting applications where a clean, professional appearance is required on switchlock assemblies.