Heavy Hex Bolt, System of Measurement Inch, Basic Material Steel, Material Grade A307B, Fastener Finish Hot Dipped Galvanized, Dia. /Thread Size 1 In. -8, Fastener Length 4 1/2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Thread Style Partially Threaded, Fastener Industry Standards ASME B 18.2. 1, Head Type Hex, Min. Thread Length 2 1/4 in, Head Height 43/64 in, Head Width 1 5/8 in, Package Quantity 5