Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1004 56A found under Bolt Machine by Accurate Prescision Fastener Corp. The National Stock Number assigned to this part is 5306004029060, 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 NAS1004 56A.