Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5 8 11HEX NUT ASTM A304 GR4140 found under Nut Plain Hexagon by American Society Of Mechanical. The National Stock Number assigned to this part is 5310014133159, 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 5 8 11HEX NUT ASTM A304 GR4140.