Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8021 found under Nut Plain Square by Federal Screw Products Inc. The National Stock Number assigned to this part is 5310009824936, 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 8021.