Hex Head Cap Screw, System of Measurement Inch, Basic Material Steel, Material Grade Grade 5, Fastener Finish Zinc Plated, Dia./Thread Size 5/16 In.-18, Fastener Length 3 3/4 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Thread Style Fully Threaded, Fastener Industry Standards ASME B18.2.1, Head Type Hex, Head Height 7/32 in, Head Width 1/2 in, Package Quantity 25