Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BL72413 found under Coupling Shaft Flex by American Telephone And Telegraph Co. The National Stock Number assigned to this part is 3010003192345, 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 BL72413.