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Grade 8 fasteners are the strongest with a minimum tensile strength of 150ksi for all diameters from ¼ inch through 1-1/2 inches. They are required to be heat-treated, quenched, and tempered.[[File:WikiSAEFastenerDesignations.png]]Inch-series fasteners utilize standards ASTM A307, ASTM A354, and ASTM A193[[File:WikiSAEFastenerDesignations.png]]