Hex Head Cap Screw, System of Measurement Inch, Basic Material PEEK, Material Grade Not Graded, Fastener Finish Plain, Dia./Thread Size 5/16 In.-18, Fastener Length 2 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Thread Style Fully Threaded, Fastener Industry Standards ANSI/ASME B18.6.3, Head Type Hex, Min. Thread Length 2 1/2 in, Head Height 1/4 in, Head Width 1/2 in, Package Quantity 10