Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6643072-15 found under Screw Cap Socket He by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 5305013907666, 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 6643072-15.