Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6643070-033 found under Screw Cap Socket He by Timken Gears And Services Inc. The National Stock Number assigned to this part is 5305012680087, 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 6643070-033.