Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 563D1 18 found under Nut Plain Hexagon by Erie Engineered Products Inc. The National Stock Number assigned to this part is 5310012246990, 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 563D1 18.