Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 559887-1 found under Damper Inertia by Raytheon Company. The National Stock Number assigned to this part is 3040000012766, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 559887-1.