Hex Head Cap Screw Head Type Hex Diameter 1/2 In. Grade 8 Material Steel Finish Plain Thread Size 1/2-20 Thread Type Fine Length under Head 4 In. Thread Length 1-1/4 In. Head Height 5/16 In. Head Width 3/4 In. Thread Style Partially Threaded Thread Direction Right Hand Proof Load 120 000 psi Tensile Strength 150 000 psi Rockwell Hardness C33 to C39 Meets/Exceeds ASME B18.2.1 Package Quantity 5