Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 999 4 43079 398 found under Screw Cap Socket He by Selex Es Limited. The National Stock Number assigned to this part is 5305121639101, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 999 4 43079 398.