Carriage Bolt Inch Neck Type Square Basic Material Steel Material Grade Grade 8 Fastener Finish Plain Dia/Thread Size 5/8 In.-11 Fastener Length 9 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.5 SAE J429 Drill Size 41/64 in Head Dia 1.344 in Head Height 21/64 in Head Type Round Square Height 0.344 in Square Width 0.642 in Tensile Strength 150 000 psi For Use With Grade 8 Hex Nuts