Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS6304U39D found under Bolt Close Tolerance by Herndon Products Inc. The National Stock Number assigned to this part is 5306016715395, 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 NAS6304U39D.