Flange Bolts, Dimensional Standards ASME B18.2.1, Drive Hex, Drive Size 5/8 in, Fastener Length 3 1/2 in, Finish Black Oxide, Flange Diameter 1 21/64 in, Flange Type Standard, Head Height 5/8 in, Head Width 15/16 in, Manufacturer Location Globally Sourced, Material Steel, Material Grade/Class Grade 8, Material Quality Standards SAE J429, Minimum Thread Length 1 1/2 in, Pack Size Small Pack, System of Measurement Inch, Tensile Strength 150,000 psi, Thread Size 5/8 In.-18