Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 71931-1513 found under Hub Coupling Flexib by Bijur Lubricating Corp. The National Stock Number assigned to this part is 3010014293736, 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 71931-1513.