Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Q4600-1-23-1 found under Coupling Shaft Rigid by Testek Inc. The National Stock Number assigned to this part is 3010012856286, 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 Q4600-1-23-1.