AR9Y715 is a metal key washer designed for use with Fuji Electric AR22 and DR22 command switches and pilot lights. This washer is specifically engineered to secure operators in 22.3mm diameter panel cutout holes, providing reliable mounting and preventing rotation. The washer features dual-sided functionality: side A is used when the panel cutout periphery has a hole to stop rotation, while side B can serve as a washer for eliminating play even when no rotation-stop hole is present. With dimensions of 22.5mm outer diameter, 29.9mm width, 12.6mm inner diameter, and 22.1mm height, the washer is manufactured from steel with a 30 square mounting interface. This accessory is essential for industrial control panel installations, machine tool interfaces, and instrumentation panels where secure and stable operator mounting is required.