Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S640-25-2495 found under Seal Kit Cylinder by Integrated Distribution Systems. The National Stock Number assigned to this part is 5330011973054, 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 S640-25-2495.