Hex Head Cap Screw, System of Measurement Inch, Basic Material Steel, Material Grade Grade 5, Fastener Finish Black Oxide, Dia./Thread Size 5/8 In.-18, Fastener Length 3 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNF (Fine), Fastener Thread Style Partially Threaded, Fastener Industry Standards ASME B18.2.1, Head Type Hex, Min. Thread Length 1 1/2 in, Head Height 25/64 in, Head Width 15/16 in, Package Quantity 5