Hex Head Cap Screw System of Measurement Inch Basic Material Steel Material Grade Grade 8 Fastener Finish Zinc Yellow Dia./Thread Size 1/2 In.-13 Fastener Length 4 1/4 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 1 1/4 in Head Height 5/16 in Head Width 3/4 in Package Quantity 5