Inch Step Bolt Steel Material Grade A307B Fastener Finish Plain Dia/Thread Size 3/8 In.-16 Fastener Length 1 1/2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) Fastener Industry Standards ASME B18.5 Head Dia 1.219 in to 1.219 in Head Height 13/64 in Square Height 0.188 in to 0.219 in Square Width 0.368 in to 0.388 in Tensile Strength 60 000 psi Package Quantity 50