Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R55-55-2 found under Spider Universal Joint Vehicular by Cleveland Steel Products Corp Sub Of. The National Stock Number assigned to this part is 2520006719498, 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 R55-55-2.