Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 531C8-5 found under Coupling Shaft Flex by Cardwell Condenser Corp. The National Stock Number assigned to this part is 3010008564127, 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 531C8-5.