Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 585-21 found under Piston by Parker Hannifin Ltd. The National Stock Number assigned to this part is 2590001169136, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 585-21.