Flange Bolts, Dimensional Standards ASME B18.2.1, Drive Hex, Drive Size 1/2 in, Fastener Length 2 1/4 in, Finish Phosphate and Oil, Flange Diameter 1 5/64 in, Flange Type Standard, Head Height 1/2 in, Head Width 3/4 in, Manufacturer Location Globally Sourced, Material Steel, Material Grade/Class Grade 8, Material Quality Standards SAE J429, Minimum Thread Length 1 1/4 in, Pack Size Bulk Pack, System of Measurement Inch, Tensile Strength 150,000 psi, Thread Size 1/2 In.-13