Hex Head Cap Screw, System of Measurement Inch, Basic Material Steel, Material Grade Grade 5, Fastener Finish Plain, Dia./Thread Size 1/2 In.-20, Fastener Length 4 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 1/4 in, Head Height 5/16 in, Head Width 3/4 in, Package Quantity 85