Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B4964 found under Retainer Packing by Rix Industries. The National Stock Number assigned to this part is 5330013687335, 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 B4964.