Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS5321E4-8 found under Bolt Six Lobe Reces by Heartland Precision Fasteners Inc. The National Stock Number assigned to this part is 5306015210514, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS5321E4-8.