Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XB20SM found under Switch Waveguide by E And M Equipment Co. The National Stock Number assigned to this part is 5985001689464, and the Federal Supply Class is 5985 Antennas Waveguides And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like XB20SM.