Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 121-6040 found under Fitting Yoke by Mechanics Division Of Borg Warner. The National Stock Number assigned to this part is 2520008468729, 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 121-6040.