5/16-18X3 1/2 Coarse Thread Hex Cap Screw Grade 5 Zinc (Pack Qty 450) BC-3156CH5O

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°FYou may also like 8-18X1 Slotted Indented Hex Washer Self Tapping Screw Type B Fully Thread 18 8 Stainless (Pack Qty 2,000) BC-0816BSW188.