Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AA50019-E518 found under Retainer Packing by United Technologies Corporation. The National Stock Number assigned to this part is 5330013269517, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AA50019-E518.