5/8-18 x 3-1/2in UNF Grade 8 Hex Cap Screw Yellow Zinc

Made from medium carbon steel, Grade 8 cap screws have a greater tensile strength than Grade 5. Designed for use in high stress applications, these bolts shall be heat treated, oil quenched, and tempered at a minimum tempering temperature of 800 degrees (F).With thread extending 1 3/4" up the shaft, Proof load is 120,000 PSI with a minimum Yield Strength of 130,000 PSI and Tensile Strength of 150,000 PSI. HHCS58312F8Y