Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4S9-214 found under Nut Plain Hexagon by Boeing Company The. The National Stock Number assigned to this part is 5310009739684, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4S9-214.