Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CSR904B-4-13 found under Rivet Solid by Sps Technologies Inc. The National Stock Number assigned to this part is 5320005569825, 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 CSR904B-4-13.