Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R13-3658 found under Sealnonmetallic Special Shaped by Seal Science Inc. The National Stock Number assigned to this part is 5330016750577, 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 R13-3658.