Carriage Bolt Inch Neck Type Square Basic Material Steel Material Grade Grade A Fastener Finish Plain Dia/Thread Size 1/2 In.-13 Fastener Length 4 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.5 SAE J429 Drill Size 33/64 in Head Dia 1.094 in Head Height 17/64 in Head Type Round Square Height 0.281 in Square Width 0.515 in Tensile Strength 74 000 psi For Use With Grade 2 Hex Nuts Package Quantity 10