Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T3170 found under Coupling Half Shaft by The Biro Manufacturing Company. The National Stock Number assigned to this part is 3010011745998, 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 T3170.