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