Hex Head Cap Screw, System of Measurement Inch, Basic Material Steel, Material Grade Grade 8, Fastener Finish Zinc Yellow, Dia./Thread Size 9/16 In.-18, Fastener Length 2 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 3/8 in, Head Height 23/64 in, Head Width 13/16 in, Package Quantity 100