Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X12T20 found under Isolator Test Set by E And M Equipment Co. The National Stock Number assigned to this part is 5985010221005, 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 X12T20.