Hex Head Cap Screw Head Type Hex Diameter 5/16 In. Grade B7 Material Alloy Steel Finish Plain Thread Size 5/16-18 Thread Type Coarse Length under Head 4 In. Thread Length 7/8 In. Head Height 13/64 In. Head Width 1/2 In. Thread Style Partially Threaded Thread Direction Right Hand Tensile Strength 125 000 psi Rockwell Hardness C35 Meets/Exceeds ASME B18.2.1 ASTM A193 Package Quantity 10