Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B471785-501REV1 found under Coupling Shaft Flexible by Obrien Gear Co. The National Stock Number assigned to this part is 3010006257831, 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 B471785-501REV1.