Hex Head Cap Screw Head Type Hex Diameter 5/16 In. Grade Non Graded Material Brass Finish Plain Thread Size 5/16-18 Thread Type Coarse Length under Head 5/8 In. Thread Length 5/8 In. Head Height 13/64 In. Head Width 1/2 In. Thread Style Fully Threaded Thread Direction Right Hand Tensile Strength 50 000 psi Rockwell Hardness B60 Package Quantity 25