Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS16997-228 found under Screw Cap Socket He by De Marzi Victor. The National Stock Number assigned to this part is 5305009789363, 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 MS16997-228.