Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NO PRIMARY REF 12-146-5026 found under Washer Lock by This Ncage Is Used To Inform That. The National Stock Number assigned to this part is 5310121465026, 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 NO PRIMARY REF 12-146-5026.