Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F 3 1 2ROUGH BORE found under Coupling Shaft Flex by Woods T B Inc. The National Stock Number assigned to this part is 3010012578899, 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 F 3 1 2ROUGH BORE.