Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NA6858-503L found under Seal Oil Bearing Bracket by Dresser Rand Co. The National Stock Number assigned to this part is 5330009600030, 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 NA6858-503L.