Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 15-1750-03239 found under Coupling Shaft Flex by Cincinnati Gear Co The. The National Stock Number assigned to this part is 3010013438238, 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 15-1750-03239.