Inch, Step Bolt, Steel, Material Grade A307B, Fastener Finish Plain, Dia./Thread Size 5/16 In.-18, Fastener Length 2 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Industry Standards ASME B18.5, Head Dia. 1.000 in to 1.031 in, Head Height 11/64 in, Square Height 0.156 in to 0.187 in, Square Width 0.307 in to 0.324 in, Tensile Strength 60,000 psi, Package Quantity 50