Flange Bolts, Dimensional Standards ASME B18.2.1, Drive Hex, Drive Size 1/4 in, Fastener Length 5/8 in, Finish Zinc Plated, Flange Diameter 9/16 in, Flange Type Serrated, Head Height 9/32 in, Head Width 3/8 in, Manufacturer Location Globally Sourced, Material Steel, Material Grade/Class Grade 5, Material Quality Standards SAE J429, Minimum Thread Length 5/8 in, Pack Size Small Pack, System of Measurement Inch, Tensile Strength 120,000 psi, Thread Size 1/4 In.-20, Thread Style Fully Threaded