Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 639146-268 found under Screw Machine by Bae Systems Information And Electronic Systems Integration Inc Div Bae Systems. The National Stock Number assigned to this part is 5305009450506, 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 639146-268.