'Hex Head Cap Screw, System of Measurement Inch, Head Type Hex, Dia./Thread Size 5/16 In.-18, Thread Type UNC (Coarse), Fastener Length 8 In., Min. Thread Length 7/8 In., Basic Material Steel, Screw Grade/Class Grade 8, Fastener Finish Plain, Thread Style Partially Threaded, Thread Direction Right Hand, Head Height 13/64 In., Screw Industry Standards ASME B18.2.1, Package Quantity 5'