Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A55581 found under Coupling Shaft Rigi by Bogue Systems Inc. The National Stock Number assigned to this part is 3010012316911, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A55581.