Hex Head Cap Screw System of Measurement Inch Basic Material Steel Material Grade A307A Fastener Finish Zinc Plated Dia./Thread Size 5/8 In.-11 Fastener Length 3 1/2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) Fastener Thread Style Fully Threaded Fastener Industry Standards ASME B18.2.1 Head Type Hex Head Height 27/64 in Head Width 15/16 in Package Quantity 5