Carriage Bolt, Inch, Neck Type Square, Basic Material Steel, Material Grade Grade 5, Fastener Finish Plain, Dia./Thread Size 5/8 In.-11, Fastener Length 2 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 120,000 psi, For Use With Grade 5 Hex Nuts, Package Quantity 25