Socket Head Cap Screw, System of Measurement Inch, Cylindrical, Basic Material Steel, Material Grade Alloy Steel, 1/2 In. -13, Length 5 1/2 in, Fastener Finish Black Oxide, Fastener Thread Type UNC (Coarse), Drive Type Hex Socket, Drive Size 3/8 in, Thread Style Partially Threaded, Thread Direction Right Hand, Min. Thread Length 1 1/2 in, Thread Length 1 1/2 in, Head Height 0.5 in, Thread Dia. 1/2 in, Package Quantity 25