Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B5018 1 3 4 found under Coupling Half Shaft by Reliance Electric Company. The National Stock Number assigned to this part is 3010014225590, 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 B5018 1 3 4.