Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 418-0339-003 found under Ring Assembly by Boeing Company The. The National Stock Number assigned to this part is 5977011754550, and the Federal Supply Class is 5977 Electrical Contact Brushes And Electrodes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 418-0339-003.