Carriage Bolt, Inch, Neck Type Square, Basic Material Steel, Material Grade Grade 8, Fastener Finish Plain, Dia./Thread Size 3/8 In.-16, Fastener Length 5 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), ASME B18.5, SAE J429, Drill Size 25/64 in, Head Dia. 0.844 in, Head Height 13/64 in, Head Type Round, Square Height 0.219 in, Square Width 0.388 in, Tensile Strength 150,000 psi, For Use With Grade 8 Hex Nuts, Package Quantity 25