Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1003-31A found under Bolt Machine by F And C Sales Inc. The National Stock Number assigned to this part is 5306009166503, 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 NAS1003-31A.