Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21115 found under Spider Universal Joint Vehicular by Taylor Machine Works Inc. The National Stock Number assigned to this part is 2520008716772, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21115.