Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MX4001 found under Mixer Crystal Coaxi by Frequency Electronics Inc. The National Stock Number assigned to this part is 5985011787841, 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 MX4001.