Hex Head Cap Screw Head Type Hex Diameter 9/16 In. Material 18-8 Stainless Steel Thread Size 9/16-18 Thread Type Fine Length under Head 5-1/2 In. Thread Length 1-3/8 In. Head Height 23/64 In. Thread Style Partially Threaded Thread Direction Right Hand Tensile Strength 85 000 to 150 000 psi Rockwell Hardness B80 to C32 Meets/Exceeds ASME B18.2.1 Package Quantity 5