Square Head Bolt Square Head Bolt Inch Steel Fastener Finish Zinc Yellow Material Grade Class 5 Dia/Thread Size 1/2 In.-13 Fastener Length 2 in Fastener Thread Direction Right Hand Fastener Thread Type UNC (Coarse) ASME B18.2.1 SAE J429 Head Height 21/64 in Head Width 3/4 in Flange Dia 1/2 in Thread Style Fully Threaded Rockwell Hardness HRC25 Head Type Square Head Package Quantity 40