Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 121-4071 found under Yoke Universal Joint Nonvehicular by Gkn Rockford Inc. The National Stock Number assigned to this part is 3010004110832, 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 121-4071.