Hex Head Cap Screw Head Type Hex Diameter 5/16 In. Material 316 Stainless Steel Thread Size 5/16-18 Thread Type Coarse Length under Head 1/2 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 85 000 to 150 000 psi Rockwell Hardness B80 to C32 Meets/Exceeds ASME B18.2.1 Package Quantity 100