Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A840-97 found under Space Washer by Dresser Rand Co. The National Stock Number assigned to this part is 2825001464149, and the Federal Supply Class is 2825 Steam Turbines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A840-97.