Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BAL-550 found under Coupler Transmission Line by Electronic Devices Inc. The National Stock Number assigned to this part is 5985015260205, 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 BAL-550.