Carriage Bolt Inch Neck Type Square Basic Material Steel Material Grade Grade A Fastener Finish Zinc Plated Dia/Thread Size 1/2 In.-13 Fastener Length 1 1/4 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.5 Drill Size 1/2 in Head Dia 1.032 in to 1.094 in Head Height 17/64 in Head Type Round Square Height 0.250 in to 0.281 in Square Width 0.492 in to 0.515 in Tensile Strength 74 000 psi For Use With Grade 2 Zinc Nuts Package Quantity 50