5/16-18X1 7/8 Coarse Thread Hex Cap Screw Grade 5 Zinc (Pack Qty 800) BC-3130CH5O

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