Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1221-06E3 found under Screw Machine by Huck International Inc. The National Stock Number assigned to this part is 5305010686313, 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 NAS1221-06E3.