Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B90B0018-1 found under Waveguide Assembly by Mcdonnell Douglas. The National Stock Number assigned to this part is 5985013644386, 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 B90B0018-1.