Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN6291-4 found under Retainer Packing by Aeronautical Standards Group. The National Stock Number assigned to this part is 5330001864947, 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 AN6291-4.