Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 13777-500 found under Case Mast by Hardigg Industries Inc. The National Stock Number assigned to this part is 5985013869589, 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 13777-500.