Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XR-1 R0UGH B0RE found under Coupling Shaft Flex by Pt Components Inc Drive Div. The National Stock Number assigned to this part is 3010012487327, 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 XR-1 R0UGH B0RE.