Inch, Structural Bolt, Steel, Material Grade A325 Type 1, Fastener Finish Hot Dipped Galvanized, Dia./Thread Size 5/8 In.-11, Fastener Length 2 1/2 in, Fastener Thread Type UNC (Coarse), Fastener Industry Standards ASTM F3125, Thread Length 1 1/4 in, Fastener Thread Direction Right Hand, Head Dia. 1 1/16 in, Head Height 25/64 in, Tensile Strength (PSI) 105,000 psi, Rockwell Hardness HRC25, Package Quantity 80