Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RA4440B1-8 found under Rivet Tubular by National Rivet And Mfg Co. The National Stock Number assigned to this part is 5320002644421, 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 RA4440B1-8.