Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W3 8SS found under Washer Flat by Control Systems Co. The National Stock Number assigned to this part is 5310012177770, 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 W3 8SS.