5/8-18X2 1/2 Fine Thread Hex Cap Screw Grade 5 Zinc (Pack Qty 125) BC-6340CH5O

Has greater tensile strength than a Grade-2. Yield-to-tensile ratio is the lowest of all heat treated steels Grade-5 cap screws shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum tempering temperature of 800°F