Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3458-603 found under Attenuator Variable by General Microwave Corporation. The National Stock Number assigned to this part is 5985014076677, 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 3458-603.