Hex Head Cap Screw, System of Measurement Inch, Basic Material Steel, Material Grade Grade 5, Fastener Finish Zinc Plated, Dia./Thread Size 1/4 In.-20, Fastener Length 2 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Thread Style Partially Threaded, Fastener Industry Standards ASME B18.2.1, Head Type Hex, Min. Thread Length 3/4 in, Head Height 5/32 in, Head Width 7/16 in, Package Quantity 550