Socket Flat Head Screw Head Type Flat System of Measurement Inch Drive Type Socket Drive Size 3/8 in Material Steel Finish Black Oxide Thread Size 5/8 In.-18 Minimum Thread Length 1 in Fastener Length 1 1/2 in Head Height 0.625 in Head Diameter 1 in Pack Size Small Pack Thread Style Fully Threaded Special Features Not Applicable Countersink Angle 82 Degrees Dimensional Standards ASME B18.3 Flange Diameter Not Applicable Flange Thickness Not Applicable