Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number J-1-4-18 found under Boot Power Transmission Componen by Rolls Royce Marine North America. The National Stock Number assigned to this part is 2520012977226, 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 J-1-4-18.