Flange Bolts Dimensional Standards ASME B18.2.1 Drive Hex Drive Size 3/8 in Fastener Length 2 1/2 in Finish Black Oxide Flange Diameter 13/16 in Flange Type Standard Head Height 3/8 in Head Width 9/16 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 3/8 In.-16 Thread Style Partially Threaded