Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN520 2 3 found under Screw Machine by A Vox Systems Inc. The National Stock Number assigned to this part is 5305014292257, 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 AN520 2 3.