Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 671-921-9005 found under Nut Plain Clinch by Sturm Ruger And Company Inc. The National Stock Number assigned to this part is 5310001698008, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 671-921-9005.