Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R08500X200A21A7 found under O Ring by Dassault Aviation. The National Stock Number assigned to this part is 5330142504906, 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 R08500X200A21A7.