Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1921M04S04WU found under Rivet Blind by Klx Aerospace Solutions Ii Sas. The National Stock Number assigned to this part is 5320014820326, and the Federal Supply Class is 5320 Rivets. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS1921M04S04WU.