Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 137 A3274156 002 found under Adapter Waveguide by Advanced Technical Materials Inc. The National Stock Number assigned to this part is 5985015336165, 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 137 A3274156 002.