Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1691-0631 found under Rivet Solid by Avdel Corp. The National Stock Number assigned to this part is 5320015975337, 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 1691-0631.