Socket Head Cap Screw Head Type Standard System of Measurement Inch Drive Type Socket Drive Size 5/16 in Material Steel Material Grade/Class ML40Cr SCM435 Finish Black Oxide Thread Size 3/8 In.-16 Minimum Thread Length 1 1/4 in Fastener Length 4 in Head Height 0.375 in Head Diameter 0.562 in Pack Size Small Pack Thread Style Partially Threaded Special Features Not Applicable Color Black Countersink Angle Not Applicable Dimensional Standards ASME B18.3