Carriage Bolt Inch Neck Type Square Basic Material Steel Material Grade Grade A Fastener Finish Hot Dipped Galvanized Dia/Thread Size 3/8 In.-16 Fastener Length 1 1/2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.5 Drill Size 25/64 in Head Dia 0.782 in Head Height 13/64 in Head Type Round Square Height 0.188 in Square Width 0.368 in Tensile Strength 74 000 psi For Use With Grade 2 Galvanized Nuts Package Quantity 100