Socket Head Cap Screw Head Type Standard System of Measurement Metric Drive Type Socket Drive Size 17 mm Material Alloy Steel Finish Black Oxide Thread Size M20-2.5 Minimum Thread Length 52 mm Fastener Length 120 mm Head Height 20 mm Pack Size Small Pack Thread Style Partially Threaded Special Features Not Applicable Countersink Angle Not Applicable Dimensional Standards ASME B18.3 Flange Diameter Not Applicable Flange Thickness Not Applicable