Flange Bolt, Dimensional Standards ASME B 18.2. 1, Drive Hex, Drive Size 5/16 in, Fastener Length 2 1/4 in, Finish Phosphate and Oil, Flange Diameter 11/16 in, Flange Type Standard, Head Height 21/64 in, Head Width 1/2 in, Manufacturer Location Globally Sourced, Material Steel, Material Grade/Class Grade 8, Material Quality Standards SAE J429, Minimum Thread Length 7/8 in, Pack Size Small Pack, System of Measurement Inch, Tensile Strength 150, 000 psi, Thread Size 5/16 In. -18