Flange Bolts, Dimensional Standards ASME B18.2.1, Drive Hex, Drive Size 1/4 in, Fastener Length 1 in, Finish Black Oxide, Flange Diameter 9/16 in, Flange Type Standard, Head Height 9/32 in, Head Width 3/8 in, Manufacturer Location Globally Sourced, Material Steel, Material Grade/Class Grade 8, Material Quality Standards SAE J429, Minimum Thread Length 1 in, Pack Size Small Pack, System of Measurement Inch, Tensile Strength 150,000 psi, Thread Size 1/4 In.-20, Thread Style Fully Threaded