Hex Head Cap Screw Head Type Hex Diameter 5/8 In. Grade 5 Material Carbon Steel Finish Zinc Plated Thread Size 5/8-18 Thread Type Fine Length under Head 10 In. Thread Length 1-3/4 In. Head Height 13/32 In. Thread Style Partially Threaded Thread Direction Right Hand Tensile Strength 105 000 to 120 000 psi Rockwell Hardness C19 to C30 Meets/Exceeds ASME B18.2.1 Package Quantity 5