Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 645531300 found under Seal Plain by Duffnorton Co Inc. The National Stock Number assigned to this part is 5330012588984, 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 645531300.