Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HPX281A found under Adapter Waveguide by Hewlett Packard Inc. The National Stock Number assigned to this part is 5985008920732, 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 HPX281A.